For riders searching for e-bikes with 4-piston brakes, this roundup focuses on 13 four-piston hydraulic brake kits, including options with e-bike power-off sensors and 180 mm rotors. My best overall pick is the Zoom HB876E 2-Pin 4-Piston Hydraulic Disc Brake Set, which pairs four-piston braking with an e-bike sensor connection. The BUCKLOS 2-PIN set is a useful alternative for riders prioritizing a power-cutoff connection, while the TOBWOLF four-piston upgrade kit suits shoppers comparing a more general MTB-style setup. The main tradeoffs are sensor compatibility, included rotor and hose details, and how much installation work the kit may require. Read on for the full breakdown and a guide to matching a brake set to your bike.
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Key Takeaways
- Sensor fit separates e-bike-specific kits from general MTB kits: several HB876E and BUCKLOS options list a 2-pin power-off connection, while the TOBWOLF kit is presented as a general MTB upgrade.
- 180 mm rotors appear repeatedly, but included parts still differ: check the exact kit contents rather than assuming every four-piston set includes rotors.
- Several listings are near-duplicates: the repeated Zmgdrm and CooMeng models make exact model details and seller-listed contents more useful than brand name alone.
- Hose length and handedness can decide fit: the BUCKLOS set specifies 850 mm front and 1550 mm rear hoses, making routing dimensions a visible point of comparison.
- Four pistons alone do not establish the best match: compatibility with the bike’s mounts, rotor size, connectors, and intended riding matters as much as the piston count.
| e bikes with 4 piston brake | Brake type | Front hose length | Rear hose length | Brake fluid |
|---|---|---|---|---|
| 4-Piston Hydraulic Disc Brake | Hydraulic disc | 850 mm (33.5 in) | 1600 mm (63.0 in) | — |
| DYISLAND E-Bike Hydraulic Disc | Hydraulic disc | — | — | Mineral oil |
| Zmgdrm HB876E 2-Pin 4-Piston H | Hydraulic disc | 950 mm (37.4 in) | 1850 mm or 1860 mm (72.8 in or 73.23 in) | Mineral oil |
| Zoom HB876E Hydraulic Disc Bra | Hydraulic disc | 950 mm (37.4 in) | 1850 mm (72.8 in) | — |
| CooMeng Zoom HB876E 4-Piston H | Hydraulic disc | — | — | — |
| Heavy Duty 4 Piston Hydraulic | — | 1,100 mm (43.3 in) | 1,900 mm (74.8 in) | DOT 4 |
| TOBWOLF MTB Hydraulic Disc Bra | Hydraulic disc | — | — | — |
| CooMeng Zoom HB876E 4-Piston H | — | 950 mm (37.4 in) | 1,850 mm (72.8 in) | Mineral oil |
| BUCKLOS EBike 2-PIN 4 Pistons | — | 1,150 mm (45.28 in) | 1,950 mm (76.77 in) | Mineral oil |
| Zmgdrm HB876E 2-Pin 4-Piston H | Hydraulic disc | 950 mm (37.4 in) | 1,850–1,860 mm (72.8–73.2 in) | Mineral oil |
| Zmgdrm HB876E 4-Piston Hydraul | Hydraulic disc | 950 mm (37.4 in) | 1850 mm or 1860 mm, per different listing sections | Mineral oil |
| CMTOTWO 4-Piston Hydraulic E-B | 4-piston hydraulic | 1100 mm (43.3 in) | 1900 mm (74.8 in) | DOT 4 |
| BUCKLOS Zoom Mountain Bike MTB | Hydraulic disc | — | — | — |
More Details on Our Top Picks
4-Piston Hydraulic Disc Brake Set for eBike, MTB, and BMX
This set is the most straightforward choice here for riders who want four-piston hydraulic braking without a stated motor-sensor requirement. Its compatibility covers most mountain bikes, BMX bikes, and e-bikes, while adjustable levers let riders tailor reach for their hands. Compared with the DYISLAND LD-200PLUS, it does not specify included rotors or a power-cutoff connector, so check what your bike needs before ordering. The listed pre-calibrated, leak-free design may simplify setup, but installation still requires removing clamp protection, and the pads need gentle stops to bed in before hard use. This makes the set a better fit for a general brake upgrade than for riders whose main priority is an integrated e-bike motor cutoff.
Pros:- Four-piston hydraulic calipers are designed for strong, responsive braking
- Adjustable levers allow a more personalized reach
- Pre-calibrated, leak-free design is intended to simplify installation
- Resin-metal hybrid pads are described as quiet-running
Cons:- Rotor inclusion and motor-sensor compatibility are not specified
- Clamp protection must be removed during installation
- Pads require a gentle bedding-in period before aggressive riding
Best for: Riders upgrading a compatible mountain bike, BMX bike, or e-bike who want adjustable four-piston brakes and do not need a specified motor cutoff sensor
Not ideal for: E-bike owners who require a confirmed motor power-off connector or a package that explicitly includes rotors
- Pistons:4
- Brake type:Hydraulic disc
- Front hose length:850 mm (33.5 in)
- Rear hose length:1600 mm (63.0 in)
- Compatibility:Most mountain bikes, BMX bikes, and e-bikes
- Pad material:Resin-metal hybrid
- Lever adjustment:Adjustable
Our verdict“Choose this set for a broadly compatible four-piston brake upgrade, but look elsewhere if you need a confirmed e-bike cutoff sensor or included rotors.”
DYISLAND E-Bike Hydraulic Disc Brake Set with 180 mm Rotors
The DYISLAND LD-200PLUS stands out for combining four-piston calipers, two 180 mm rotors, and pre-filled hoses, giving buyers a more complete package than the 4-Piston Hydraulic Disc Brake Set, which does not list rotors. Its sintered metal pads and 2.3 mm rotors are aimed at sustained braking, while adjustable lever travel helps tune the feel. The power-off sensor can cut motor output during braking, but compatibility is less universal than the broad bike fit listed for the basic four-piston set: this model requires a compatible 2-pin connection and left-side brake discs. I would favor it when those fit requirements are confirmed and a rotor-and-brake bundle is useful; otherwise, the connector and rotor-side limits may rule it out.
Pros:- Includes front and rear brakes plus two 180 mm rotors
- Pre-filled mineral-oil hoses avoid an initial bleed
- Sintered metal pads and thick rotors are designed for durable braking
- Power-off sensor can cut motor output when braking
Cons:- Compatible only with bicycles using left-side brake discs
- The 2-pin connector must match the bike’s wiring
- The listed warranty is only one month
Best for: E-bike owners with left-side brake discs and a compatible 2-pin system who want brakes and 180 mm rotors in one package
Not ideal for: Riders with right-side brake discs, incompatible wiring, or a bike whose rotor and connector setup has not been checked
- Model:LD-200PLUS
- Brake type:Hydraulic disc
- Caliper:4-piston
- Rotor size and thickness:180 mm; 2.3 mm thick
- Pad material:MT600 sintered metal
- Front and rear hose lengths:1100 mm front; 1900 mm rear
- Brake fluid:Mineral oil
- Connector:2-pin waterproof
- Package weight:1.53 kg
Our verdict“Pick the DYISLAND when your e-bike matches its left-disc and 2-pin requirements and you want rotors included with the four-piston brake set.”
Zmgdrm HB876E 2-Pin 4-Piston Hydraulic E-Bike Brake Set
The Zmgdrm HB876E pairs pre-bled four-piston brakes with two 180 mm rotors and a detachable 2-pin sensor, making it a focused option for e-bikes that already use that connector. Like the CooMeng Zoom HB876E, it offers a motor power-off sensor and included rotors; unlike CooMeng, its listed connector is 2-pin rather than both 2-pin and 3-pin. That narrower specification can suit a known 2-pin installation, but it gives less flexibility when wiring differs. The front hose is listed at 950 mm, while the rear length appears as either 1850 or 1860 mm. I would verify that rear measurement and the connector before ordering, since the small listing inconsistency matters when routing lines on a particular frame.
Pros:- Four-piston calipers are supplied with two 180 mm rotors
- Pre-bled mineral-oil system reduces initial setup work
- Detachable sensor can cut motor power while braking
- Waterproof 2-pin connector is specified
Cons:- Rear hose length is listed inconsistently as 1850 or 1860 mm
- Connector compatibility must be confirmed with the bike
- No pad material or rotor thickness is specified
Best for: E-bike owners with a confirmed 2-pin waterproof connection who want a pre-bled four-piston set with rotors
Not ideal for: Riders needing a 3-pin connector option or those unable to verify rear hose reach before purchase
- Model:HB876E
- Brake type:Hydraulic disc
- Pistons:4 per brake
- Rotor size:180 mm
- Front hose length:950 mm (37.4 in)
- Rear hose length:1850 mm or 1860 mm (72.8 in or 73.23 in)
- Brake fluid:Mineral oil
- Sensor connector:2-pin waterproof
- Included components:Brake set and two rotors
Our verdict“Choose this Zmgdrm set when your bike has a confirmed 2-pin connection and the listed hose lengths suit its frame.”
Zoom HB876E Hydraulic Disc Brake Set for E-Bikes, 2-Pin Sensor, 4-Piston, Red
This red HB-876E is the quiet-focused pick in this group, using resin-metal composite pads alongside four-piston calipers and a detachable 2-pin power-off sensor. Compared with the Zmgdrm HB876E, its rear hose is listed consistently at 1850 mm, though Zmgdrm includes two rotors in its stated package and this product data does not list rotors. The power cutoff is useful only if the waterproof connector matches the bike, so the 2-pin label is not a substitute for checking the actual wiring. There is also a notable setup tradeoff: despite the general appeal of a hydraulic kit, this one is described as requiring brake alignment and bleeding. It suits buyers who prioritize quieter pad behavior and a red finish over a simpler installation.
Pros:- Four-piston calipers are intended to provide strong stopping power
- Resin-metal composite pads are designed for quieter braking and rotor protection
- Detachable 2-pin sensor can cut motor output while braking
- Front and rear hose lengths are specified
Cons:- Installation requires brake alignment and hydraulic bleeding
- Rotor inclusion is not specified
- Connector compatibility and hose reach need checking before purchase
Best for: E-bike riders who value quieter braking, want a red brake set, and can handle hydraulic alignment and bleeding
Not ideal for: Buyers seeking a ready-to-fit pre-bled kit, confirmed included rotors, or a connector beyond the specified 2-pin type
- Model:HB-876E
- Brake type:Hydraulic disc
- Pistons:4
- Sensor connector:2-pin waterproof
- Front hose length:950 mm (37.4 in)
- Rear hose length:1850 mm (72.8 in)
- Brake pad material:Resin-metal composite
- Color:Red
- Warranty:1 year
Our verdict“Choose this model if quiet pad behavior and its red finish matter more than a ready-bled installation or a clearly stated rotor bundle.”
CooMeng Zoom HB876E 4-Piston Hydraulic E-Bike Brake Set with 180 mm Rotors
CooMeng is the most adaptable pick here for riders who are still matching brake sensors to e-bike wiring: it lists both 2-pin and 3-pin connectors, plus a power-off sensor, two 180 mm rotors, and mounting adapters. That makes it broader on connector options than the Zmgdrm HB876E, which specifies 2-pin only. The tradeoff is that some 3-pin setups may need rewiring before the cutoff works, so the extra connector option does not guarantee plug-and-play fit. The kit is pre-bled with 950 mm and 1850 mm hoses, but those lengths still need to match the frame. For buyers who want more included mounting hardware and connector flexibility, this is the most complete specified package in this five-product group.
Pros:- Lists both 2-pin and 3-pin connector options
- Includes two 180 mm rotors and mounting adapters
- Pre-bled mineral-oil system is ready for installation
- Includes universal brake pads
Cons:- Some 3-pin setups may require rewiring for motor cutoff
- Hose lengths must be checked against the bike’s routing needs
- Compatibility still depends on the bike’s sensor and rotor setup
Best for: E-bike owners comparing 2-pin and 3-pin wiring who want included 180 mm rotors, adapters, and a pre-bled brake set
Not ideal for: Riders who need a guaranteed no-rewiring 3-pin installation or whose frame requires different hose lengths
- Model:Zoom HB876E
- Brake type:Hydraulic disc
- Calipers:4 pistons each
- Rotor size:180 mm
- Connectors:2-pin and 3-pin
- Front and rear hose lengths:950 mm front; 1850 mm rear
- Fluid:Mineral oil; pre-bled
- Included components:Two rotors, mounting adapters, and universal brake pads
- Item weight:1.31 kg
Our verdict“Pick CooMeng when connector flexibility and included installation parts matter, but confirm wiring and hose fit before relying on its motor cutoff.”
Heavy Duty 4 Piston Hydraulic Brakes for Ebike – 180mm Rotor (Black)
This kit stands out for pairing four-piston calipers with 2.75 mm-thick, 180 mm rotors, a substantial rotor specification for riders who want braking hardware designed for e-bike loads. It arrives pre-bled with DOT 4 fluid and includes mounting brackets plus a hose-cutting tool, so the package covers more of the installation than the TOBWOLF set, whose listing emphasizes caliper and rotor materials instead. The tradeoff is fit: the calipers can only mount on the left side of the wheel, so buyers need to check their frame and fork layout before ordering. Its three-month warranty is also shorter than many riders may want for a brake upgrade. I’d choose it for rotor thickness and kit completeness, not for the most flexible fit.
Pros:- Four-piston calipers are suited to the greater stopping demands of many e-bikes.
- Thickened 2.75 mm rotors prioritize durability and heat capacity.
- Pre-bled with DOT 4 fluid to reduce setup work.
- Includes front and rear brakes, rotors, mounting brackets, and a hose-cutting tool.
Cons:- Calipers can only be installed on the left side of the wheel.
- The three-month manufacturer warranty is limited.
- DOT 4 fluid may not match the fluid used by every existing brake system.
Best for: E-bike owners seeking a complete front-and-rear kit with thick 180 mm rotors and the tools for hose adjustment.
Not ideal for: Riders whose frame or fork requires right-side caliper mounting, or buyers who want a longer manufacturer warranty.
- Brand:CMTOTWO
- Model:YS-2PIN-4-NEW
- Caliper:Four-piston hydraulic
- Rotor size:180 mm
- Rotor thickness:2.75 mm
- Brake fluid:DOT 4
- Front hose length:1,100 mm (43.3 in)
- Rear hose length:1,900 mm (74.8 in)
- Manufacturer warranty:3 months
Our verdict“Choose this kit if thick rotors and included installation tools matter more than mounting flexibility or warranty length.”
TOBWOLF MTB Hydraulic Disc Brake Set, Four-Piston Bike Brake Upgrade Kit
The TOBWOLF set is the clearest choice here for riders focused on sustained braking: its four-piston calipers pair with optimized heat-dissipation channels and ceramic pads. That combination targets more consistent performance during prolonged descents, while the CMTOTWO kit instead makes its case with unusually thick rotors and a tool-inclusive package. TOBWOLF also lists CNC-machined aluminum calipers and stainless-steel, six-bolt rotors, but the supplied information does not specify rotor diameter or hose lengths. That makes compatibility checks more important than with the CooMeng HB876E, which lists 180 mm rotors and hose measurements. Installation may need adjustment, and swapping controls can risk minor oil leakage, so this is better for mechanically confident riders than a simple plug-in replacement.
Pros:- Four-piston calipers provide a larger braking system than a typical two-piston setup.
- Heat-dissipation channels and ceramic pads are aimed at prolonged braking.
- CNC-machined aluminum-alloy calipers balance strength and weight.
- Stainless-steel six-bolt rotors and replaceable pads support routine servicing.
Cons:- Rotor diameter and hose lengths are not specified in the supplied product data.
- Installation may require adjustment and careful caliper alignment.
- Swapping brake controls may cause minor oil leakage.
Best for: Mountain and e-bike riders who make long descents and value heat management, and who can handle brake setup and adjustment.
Not ideal for: Buyers who need confirmed rotor diameter, hose lengths, or a low-adjustment installation from the product listing.
- Pistons:Four
- Caliper material:Aluminum alloy
- Brake pads:Ceramic
- Rotor type:Stainless steel, six-bolt
- Heat management:Optimized channels
- Brake type:Hydraulic disc
Our verdict“Pick TOBWOLF for descent-oriented heat management if you can verify fit and are comfortable with setup work.”
CooMeng Zoom HB876E 4-Piston Hydraulic E-Bike Brake Set with 180 mm Rotors
The CooMeng HB876E is a practical pick for e-bike owners who need braking hardware and motor-cutoff support in one package. Its pre-bled four-piston brakes come with 180 mm rotors, adapters, and a power-off sensor listed for both 2-pin and 3-pin connectors. That gives it broader stated connector support than the Zmgdrm HB876E, which is specified for a 2-pin waterproof connector only. The catch is that a 3-pin bike may still need rewiring to cut motor power, so connector count alone does not guarantee a plug-in match. The CooMeng’s 950 mm front hose is also shorter than the Bucklos HD-E735’s 1,150 mm front hose; measure your routing before choosing. This is the more adaptable listing, not a universal fit guarantee.
Pros:- Four-piston calipers and included 180 mm rotors make this a complete brake upgrade set.
- Pre-bled hydraulic system reduces initial setup work.
- Power-off sensor is listed for 2-pin and 3-pin connectors.
- Includes mounting adapters and uses mineral oil.
Cons:- Some 3-pin setups may require rewiring for motor cutoff.
- The 950 mm front hose may be too short for some frames or routing paths.
- Connector compatibility still needs to be confirmed against the bike.
Best for: E-bike owners with a 2-pin or 3-pin brake-sensor setup who want listed rotor and hose dimensions before fitting.
Not ideal for: Riders with a long or unusually routed front brake line, or anyone unwilling to modify wiring on some 3-pin systems.
- Brand and model:CooMeng Zoom HB876E
- Caliper pistons:Four per caliper
- Rotor size:180 mm
- Sensor connector:2-pin or 3-pin
- Front hose length:950 mm (37.4 in)
- Rear hose length:1,850 mm (72.8 in)
- Brake fluid:Mineral oil
- Package weight:1.29 kg
Our verdict“Choose the CooMeng if you want a pre-bled 180 mm kit with stated 2-pin and 3-pin sensor support and have verified hose fit.”
BUCKLOS EBike 2-PIN 4 Pistons Electric Power Off MTB Hydraulic Disc Brake
For bikes with longer cable routes, the Bucklos HD-E735’s 1,150 mm front and 1,950 mm rear hoses give it a clear fit advantage over the CooMeng Zoom HB876E, which lists shorter lines. Its four-piston calipers are paired with a 2-pin motor power-off sensor, so braking can cut motor output when the system is correctly connected. The brakes use mineral oil and arrive described as ready to install, but the supplied instructions warn against removing the yellow pad spacer before installation because that can lead to oil leakage. Compared with the CooMeng, the Bucklos is more specific about its 2-pin setup but does not offer the same stated 3-pin sensor compatibility. It suits a matching 2-pin bike, not a buyer seeking broad connector flexibility.
Pros:- Four-piston calipers are designed for stronger braking capacity.
- 2-pin sensor cuts motor power when the brake is applied.
- Long front and rear hoses accommodate extended routing.
- Mineral-oil system is described as ready to use from the package.
Cons:- Sensor is specified for 2-pin connections, limiting compatibility with other setups.
- Supplied product data does not specify rotor size or rotor material.
- Installation requires keeping the yellow pad spacer in place until fitting to avoid possible oil leakage.
Best for: E-bike or e-scooter owners with a 2-pin cutoff connection and longer-than-average hose routing.
Not ideal for: Riders whose bike uses a 3-pin sensor, or buyers who need clearly documented rotor size and material before purchase.
- Model:HD-E735
- Caliper:Four-piston hydraulic
- Sensor connector:2-pin
- Power-off sensor:Automatic motor cutoff when braking
- Brake fluid:Mineral oil
- Front hose length:1,150 mm (45.28 in)
- Rear hose length:1,950 mm (76.77 in)
- Caliper and lever material:Aluminum
- Package weight:0.94 kg
Our verdict“Choose the Bucklos if your bike has a 2-pin cutoff connection and needs longer hoses, but verify rotor fit before ordering.”
Zmgdrm HB876E 2-Pin 4-Piston Hydraulic E-Bike Brake Set
The Zmgdrm HB876E keeps the setup focused: pre-bled mineral-oil brakes, two 180 mm rotors, and a detachable waterproof 2-pin sensor for motor cutoff. Compared with the CooMeng HB876E, it has a narrower stated connector fit, but the detachable sensor offers a clear way to handle a bike where that component is not needed or does not match. Its listed hose lengths suit many standard layouts, though the rear measurement varies between 1,850 and 1,860 mm in the supplied data. Buyers should check their routing and connector before installation, then allow time for caliper alignment and routine hydraulic setup. This is a more targeted option than the CooMeng’s 2-pin/3-pin listing, and a sensible match only when the bike’s 2-pin system is confirmed.
Pros:- Four-piston calipers provide a substantial braking setup for e-bike use.
- Pre-bled mineral-oil system limits initial bleeding work.
- Detachable waterproof 2-pin sensor can cut motor output during braking.
- Includes two 180 mm rotors.
Cons:- Sensor connector is specified as 2-pin, unlike the CooMeng’s stated 2-pin or 3-pin support.
- Rear hose length is inconsistently listed as 1,850 mm and 1,860 mm.
- Caliper alignment and hydraulic maintenance still require care.
Best for: Owners of 2-pin e-bikes seeking a pre-bled four-piston set with 180 mm rotors and a detachable motor-cutoff sensor.
Not ideal for: Riders with 3-pin systems, nonstandard rotor requirements, or limited room for caliper adjustment during installation.
- Brand and model:Zmgdrm HB876E
- Brake type:Hydraulic disc
- Pistons:Four
- Sensor connector:2-pin waterproof
- Power-off sensor:Detachable
- Brake fluid:Mineral oil
- Rotors:Two × 180 mm
- Front hose length:950 mm (37.4 in)
- Rear hose length:1,850–1,860 mm (72.8–73.2 in)
Our verdict“Pick the Zmgdrm HB876E for a confirmed 2-pin bike that needs a pre-bled set with 180 mm rotors and a detachable cutoff sensor.”
Zmgdrm HB876E 4-Piston Hydraulic E-Bike Brake Set with 2-Pin Power-Off Sensor
I’d choose the Zmgdrm HB876E when replacing an e-bike brake set that already uses a compatible 2-pin power-off sensor. The sensor cuts motor output as the rider brakes, while the four-piston hydraulic calipers are designed to provide more braking force than simpler calipers. It also arrives pre-bled with two 180 mm rotors, reducing the need to source those parts separately. Compared with the CMTOTWO 4-Piston Hydraulic E-Bike Brake Kit, this set uses mineral oil rather than DOT 4 and does not list adapters or a hose-cutting tool. The main catch is fit: the listing gives two different rear-hose lengths, and connector compatibility needs checking before purchase. I’d skip it if your frame needs a precisely specified rear hose or a different sensor plug.
Pros:- Four-piston hydraulic calipers are designed for increased braking force.
- Detachable 2-pin sensor cuts motor output during braking.
- Includes two 180 mm rotors.
- Pre-bled mineral-oil system simplifies installation.
Cons:- Rear hose length is listed as both 1850 mm and 1860 mm.
- Connector and hose compatibility must be checked against the bike.
- Adapters and installation tools are not listed among the included components.
Best for: E-bike owners replacing a compatible 2-pin sensor brake set who want pre-bled hydraulics and included rotors.
Not ideal for: Riders whose bikes use a different sensor connector or need a confirmed rear-hose length before ordering.
- Model:HB876E
- Brake type:Hydraulic disc
- Pistons:4
- Power-off sensor:Detachable, waterproof 2-pin connector
- Brake fluid:Mineral oil
- Rotor size:180 mm
- Front hose length:950 mm (37.4 in)
- Rear hose length:1850 mm or 1860 mm, per different listing sections
Our verdict“Choose this set for a compatible 2-pin e-bike replacement when its hose lengths suit your frame, but skip it if the rear-hose discrepancy leaves too much uncertainty.”
CMTOTWO 4-Piston Hydraulic E-Bike Brake Kit with 180 mm Rotors
The CMTOTWO kit is the most installation-ready option of these three: it includes front and rear brakes, two 180 mm rotors, mounting adapters, and a hose-cutting tool. Its pre-bled system uses DOT 4 fluid, and the rotors are specified as 2.75 mm thick. That package gives a home mechanic more of the pieces needed for a complete setup than the Zmgdrm HB876E, whose listing includes rotors but not those extra tools. The tradeoff is a firm compatibility constraint: its calipers install only on the left side of the wheel, so buyers need to confirm their bike’s layout before ordering. The stated warranty is also just three months. I’d pass if your setup needs right-side calipers or if extended warranty coverage is a deciding factor.
Pros:- Includes front and rear brakes, two rotors, mounting adapters, and a hose-cutting tool.
- Pre-bled hydraulic system uses DOT 4 fluid.
- Four-piston design is intended to provide strong braking and modulation.
- Rotors are specified as 2.75 mm thick.
Cons:- Calipers can only be installed on the left side of the wheel.
- The stated warranty is three months.
- At 4 lb, it may be a substantial addition for riders prioritizing low component weight.
Best for: E-bike owners or home mechanics seeking a pre-bled front-and-rear kit with rotors, adapters, and a hose-cutting tool included.
Not ideal for: Riders whose frame or brake routing requires right-side caliper installation, or buyers seeking a longer stated warranty.
- Brake type:4-piston hydraulic
- Connector:Waterproof 2-pin power-off
- Brake fluid:DOT 4
- Rotor size and thickness:180 mm; 2.75 mm thick
- Front hose length:1100 mm (43.3 in)
- Rear hose length:1900 mm (74.8 in)
- Item weight:4 lb
- Caliper installation:Left side of wheel
- Included components:Front and rear brake kit, two rotors, mounting adapters, hose-cutting tool
Our verdict“Pick the CMTOTWO if its left-side caliper layout matches your bike and you want the most complete installation package of these three.”
BUCKLOS Zoom Mountain Bike MTB 4 Piston Hydraulic Disc Brake Set – Left Front 850mm, Right Rear 1550mm, Pre-Bled
I’d give the BUCKLOS Zoom set the edge for riders choosing brakes across different bike styles: its listed compatibility spans e-bikes, fat bikes, mountain bikes, road bikes, scooters, folding bikes, and BMX. The four-piston hydraulic system comes pre-bled with mineral oil, and resin-metal composite pads are described as supporting quiet braking. Compared with the CMTOTWO kit, BUCKLOS emphasizes broad vehicle compatibility rather than supplying rotors, adapters, and a cutting tool; those extras are not listed here. Its fixed 850 mm front and 1550 mm rear cable lengths can also limit fit on some frames. Installation calls for care to avoid oil leakage, so this is less appealing to someone seeking a kit with more installation accessories or exact fit flexibility.
Pros:- Listed compatibility covers e-bikes and several other bike and scooter types.
- Four-piston hydraulic brakes are intended to provide strong braking.
- Pre-bled mineral-oil system reduces bleeding work during setup.
- Resin-metal composite pads are described as supporting quiet operation.
Cons:- 850 mm front and 1550 mm rear cable lengths may not suit every frame.
- Rotors and mounting adapters are not listed as included.
- Installation requires careful handling to avoid oil leakage.
Best for: Owners of mixed-use or non-standard bikes who want pre-bled four-piston hydraulics and have confirmed the listed hose lengths fit.
Not ideal for: Riders who need included rotors or tools, require longer hose runs, or want to avoid careful hydraulic installation.
- Piston count:4
- Brake type:Hydraulic disc
- Front cable length:850 mm
- Rear cable length:1550 mm
- Material:Aluminum alloy
- Fluid and bleeding:Pre-bled mineral oil
- Compatibility:E-bike, fat bike, MTB, road bike, scooter, folding bike, BMX
Our verdict“Choose BUCKLOS for broad bike-type compatibility when its hose lengths fit and you already have the required rotors and installation parts.”
How We Picked
I ranked these 13 listings around the needs implied by the search: a four-piston hydraulic setup that can work on an e-bike. I gave more weight to explicit e-bike details, such as a listed 2-pin power-off sensor, clear rotor information, and stated hose dimensions, than to broad claims about braking power. I also looked at whether a listing gives buyers enough detail to check fit and installation before ordering.
Where listings appear to be duplicates or share the HB876E designation, I treated them as close alternatives rather than assuming meaningful performance differences without evidence. The higher-ranked options offer clearer e-bike-specific details or more useful fit information; general MTB kits rank lower for this use because buyers may need to verify sensor compatibility themselves. None can be judged as a universal fit from its name alone, so the ranking rewards specification clarity while recognizing that frame, lever, rotor, and connector compatibility can change the best choice.
| e bikes with 4 piston brake | Model | Brake fluid |
|---|---|---|
| 4-Piston Hydraulic Disc Brake | — | — |
| DYISLAND E-Bike Hydraulic Disc | LD-200PLUS | Mineral oil |
| Zmgdrm HB876E 2-Pin 4-Piston H | HB876E | Mineral oil |
| Zoom HB876E Hydraulic Disc Bra | HB-876E | — |
| CooMeng Zoom HB876E 4-Piston H | Zoom HB876E | — |
| Heavy Duty 4 Piston Hydraulic | YS-2PIN-4-NEW | DOT 4 |
| TOBWOLF MTB Hydraulic Disc Bra | — | — |
| CooMeng Zoom HB876E 4-Piston H | — | Mineral oil |
| BUCKLOS EBike 2-PIN 4 Pistons | HD-E735 | Mineral oil |
| Zmgdrm HB876E 2-Pin 4-Piston H | — | Mineral oil |
| Zmgdrm HB876E 4-Piston Hydraul | HB876E | Mineral oil |
| CMTOTWO 4-Piston Hydraulic E-B | — | DOT 4 |
| BUCKLOS Zoom Mountain Bike MTB | — | — |
Factors to Consider When Choosing E Bikes With 4 Piston Brakes
Four-piston brakes are only one part of a compatible e-bike setup. I would check the bike’s existing hardware and electrical connections before choosing by product title, since the right kit depends on fit as well as braking design.
Match the Power-Off Sensor Before Buying
An e-bike brake lever may need to signal the motor controller to cut power when you brake. A listing that says 2-pin sensor is a useful starting point, but it does not prove that the connector matches your bike. Check the plug shape, pin count, wiring arrangement, and controller requirements against your current brake or the bike maker’s documentation. A connector mismatch can leave you with brakes that function mechanically but do not trigger motor cutoff. If your bike does not use a brake sensor, a sensor-equipped set may add wiring work without adding a useful feature. Avoid ordering from the phrase “e-bike compatible” alone.
Confirm Rotor Diameter and Mounting
Rotor diameter affects how a brake setup fits and how much leverage it can provide, but a larger rotor is not automatically a drop-in upgrade. Check the current rotor size, caliper mounting standard, and whether an adapter is needed for the proposed setup. Listings in this group often mention 180 mm rotors, yet the product title may not tell you whether both rotors are included or what mounting hardware comes in the box. The frame and fork also have limits on rotor size, so confirm those before moving up from a smaller disc. Reusing existing rotors may work only if their condition, thickness, and compatibility meet the brake maker’s requirements. The common mistake is choosing by rotor diameter without checking mounts and included parts.
Measure Hose Length and Check Lever Sides
Brake hoses must reach from each lever to its caliper along the bike’s actual routing path, with enough slack for steering and suspension movement. A listed length such as 850 mm front and 1550 mm rear offers a useful reference, but your frame size and routing can change what you need. Check whether the product is sold as a front-and-rear pair and whether the levers are assigned to the expected sides for your region and bike. Some hydraulic hoses may be shortened by a qualified mechanic, while extensions or replacement hoses can add complexity. Do not rely on a generic “fits most bikes” claim if your bike has internal routing or an unusual cockpit layout. Measure the existing route before choosing.
Understand What Four Pistons Do—and Do Not—Tell You
Four-piston calipers can offer more pad contact and heat management than some simpler designs, which can suit heavier bikes or sustained descents. That label alone does not tell you how the brake will feel or perform: pad compound, rotor size, lever design, setup, and rider load also matter. For commuting on flatter routes, a well-matched two-piston system may already meet the rider’s needs, so upgrading purely for piston count can add cost and installation work without a clear benefit. Riders carrying cargo or riding steep terrain may place more value on additional braking capacity. Treat piston count as one specification, not a complete measure of stopping performance.
Plan for Installation, Bleeding, and Maintenance
A hydraulic kit may arrive pre-bled, partially assembled, or require setup; the product title does not always make the installation process clear. Check whether the hoses need cutting, whether the system needs bleeding, and whether the kit includes the tools, fittings, pads, and rotors you need. Incorrect hose cutting or air in the line can compromise brake feel, so a first-time installer may prefer a shop or a kit with clear instructions and accessible support. Also confirm replacement-pad availability before choosing an unfamiliar caliper. Regular inspection of pad wear, rotor condition, leaks, and lever feel matters regardless of the number of pistons. Budget time for setup, not just the parts swap.
Compare Complete Kits, Not Just Product Names
Several listings here share model names or appear as close variations, so compare the actual parts in the box rather than assuming two listings are identical. Look for clear statements about front and rear brakes, rotors, adapters, hoses, sensors, and pads. A kit that includes the right rotors may save sourcing steps, while a bare brake set may be a better fit if you already have compatible discs. Seller descriptions can also leave out details that matter, so request clarification when connector or mounting information is missing. Avoid paying for duplicate components you cannot use, but do not assume an incomplete kit will cost less to finish once the missing pieces are added. A checklist of your bike’s current parts makes comparisons more reliable.
Frequently Asked Questions
Will any 2-pin e-bike brake sensor work with my bike?
No. “2-pin” describes the number of electrical contacts, not necessarily the plug shape, wiring, or controller signal your bike requires. Compare the connector with your existing lever and check your bike’s wiring documentation before ordering. Some systems use different connectors or sensor behavior despite sharing a pin count. If the seller cannot confirm compatibility, ask the bike maker or a qualified e-bike shop rather than relying on the listing title.
Can I install a four-piston brake kit and keep my existing rotors?
Possibly, but the rotor must be compatible with the caliper and pads and remain within its wear limits. Confirm rotor diameter, thickness, mounting style, and condition before reusing it. A new caliper does not automatically require a new rotor, but worn, damaged, or incompatible discs can undermine the setup. Check the brake maker’s specifications for accepted rotor dimensions and material. If those details are absent, verify them before installation.
Is a 180 mm rotor always the right choice for an e-bike?
No. The correct size depends on the frame and fork limits, current mounts, required adapters, wheel setup, and the brake maker’s guidance. A larger rotor can offer more leverage and heat capacity, but it may not fit your bike without an approved adapter or may exceed its component limits. Check the maximum rotor size listed for both the frame and fork, since they can differ. Choose a compatible setup rather than treating 180 mm as a universal upgrade.
Should I choose a general MTB brake kit or one listed for e-bikes?
A general MTB kit may suit a bike that does not need an electronic brake cutoff, provided its mechanical fit is correct. For an e-bike that expects a motor-cutoff signal from the brake lever, a kit with a compatible sensor connection is a more direct starting point. Confirm the connector and controller behavior; an e-bike label alone is not proof of compatibility. Also compare hose lengths, rotor fit, and included parts, since the word “MTB” does not tell you whether the kit fits your specific bike. Choose based on the bike’s requirements, not the category name.
What should I do if the brake kit arrives with hoses that are too long?
Do not coil excess hose tightly or cut it without confirming the brake’s installation procedure. Some hydraulic systems can be shortened with the correct fittings and tools, but doing so may require a fresh bleed and can affect warranty coverage. Check whether the hose can be trimmed and whether replacement olives, inserts, or other fittings are needed. If you are unfamiliar with hydraulic brakes, ask a bike mechanic to route and size the lines. Leave enough slack for full steering movement and suspension travel.
Conclusion
My best overall choice is the Zoom HB876E 2-Pin set for shoppers who want a four-piston kit with an explicitly listed e-bike sensor; verify the connector before ordering. For best value, compare the repeated Zmgdrm or CooMeng HB876E listings by included rotors, sensor details, and hose contents rather than assuming their names mean identical packages. The best premium fit for a specific need is the BUCKLOS 2-PIN option when its power-off connection and stated hose lengths match your bike. Beginners should favor the listing with the clearest complete-kit details and have a shop handle any hose cutting or bleeding; the TOBWOLF MTB kit is better suited to buyers comfortable confirming compatibility themselves. If sensor integration is not needed, compare the general-purpose four-piston sets, but choose only after checking mounts, rotor size, and parts included.
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