The best front brake master cylinder depends on your vehicle’s make, model, year, and brake-line and handlebar dimensions. For Honda ATVs, the JAVIK and M MATI options list broad TRX and ATC fitment; the JAVIK Suzuki cylinder covers many KingQuad and other Suzuki models. The Polaris option is specifically identified as a left front cylinder, while the EOPOAYI model targets many GY6 scooters and small vehicles. Check the listed fitment and measurements against your original part before ordering.
| Product | Best For | Key Check |
|---|---|---|
| JAVIK Honda ATV | Listed Honda TRX and ATC models | 9/16-inch bore; OEM number |
| JAVIK Suzuki ATV | Listed Suzuki ATV models | 9/16-inch bore; model and year |
| M MATI Honda ATV | Listed Honda TRX and ATC models | OEM number and fitment |
| EOPOAYI GY6 | Many GY6 scooters and small vehicles | 8 mm mirror hole and exclusions |
| JAVIK Polaris | Listed Polaris ATV models | Left front; 3/4-inch bore |
JAVIK Front Brake Master Cylinder for Honda ATVs
Best for: Owners of the Honda TRX and ATC models and years included in the product fitment list. It names TRX200, TRX250, TRX300, TRX350, TRX420, TRX500, and TRX520 models, along with ATC200X, ATC250R, and ATC350X.
The listed OEM number is 45510-HR3-305, with multiple replacement numbers also provided. The cylinder is described as aluminum and designed for a 7/8-inch handlebar. Its stated piston bore is 9/16 inch, or 14.3 mm, and both the mirror hole and banjo bolt are listed as M10×1.25.
Choose this if those identifiers match your original cylinder. Limitation: The listing excludes the TRX300FW edition, and its extensive fitment list still needs to be checked against the exact year and trim.
JAVIK Front Brake Master Cylinder for Suzuki ATVs
Best for: Riders with a listed Suzuki KingQuad, QuadRunner, QuadSport, QuadRacer, Eiger, Vinson, Ozark, QuadMaster, or Twin Peaks model. The fitment spans numerous model families and production years, so matching the precise vehicle is especially important.
The product specifies a 7/8-inch handlebar, a 9/16-inch (14.3 mm) piston bore, and M10×1.25 dimensions for the mirror hole and banjo bolt. It is described as a high-strength aluminum cylinder. These measurements give buyers useful points to compare with the removed part.
Choose this option when your Suzuki model and the listed dimensions align. Limitation: The broad fitment range does not mean it fits every Suzuki ATV; confirm the year, model designation, and connection dimensions first.
M MATI Front Brake Master Cylinder for Honda ATVs
Best for: Honda ATV owners seeking a replacement identified by OEM part number 45510-HR3-305. The listed applications include ATC200X, ATC250R, ATC350X, and several TRX models, including TRX200, TRX250, TRX300, TRX350, TRX420, TRX500, and TRX520.
M MATI lists the same set of replacement part numbers as the JAVIK Honda option and describes the cylinder as a replacement made with advanced materials and precision manufacturing. Its stated fitment provides a useful starting point for checking whether the part corresponds to a specific Honda ATV.
Choose this if the OEM number or one of the listed replacements matches your existing part. Limitation: The listing excludes the TRX300FW edition and does not provide bore, mirror-hole, or banjo-bolt measurements in the supplied details, so compare those dimensions independently.
EOPOAYI GY6 Front Brake Master Cylinder
Best for: Owners of many listed GY6 scooters, mopeds, small ATVs, pit bikes, and dune buggies who need a right-side front brake lever and pump. The listing names brands and models such as Taotao, Baja, Jonway, Roketa, and several 50cc scooter families.
The product has an 8 mm mirror hole, a different specification from the M10×1.25 mirror holes listed for the Honda and Suzuki cylinders above. The product details describe an aluminum handle and a brake-fluid inspection window. They also state that the design is sealed to help prevent fluid bypass.
Choose this if your vehicle is included in the fitment list and the mirror-hole size matches. Limitation: It is listed as incompatible with GY6 49cc engine scooters, Taotao DB14, and Coolster 125 214FC pit bikes.
JAVIK Left Front Brake Master Cylinder for Polaris
Best for: Owners of the listed Polaris Sportsman, Scrambler, Magnum, Trail Blazer, Xpedition, Xplorer, ATP, and other specified ATV models. The listing explicitly identifies this as a left front cylinder, making side selection a key part of fitment verification.
The product is specified for a 7/8-inch handlebar and has a 3/4-inch (19 mm) bore. Its listed banjo bolt size is 10×1 mm. Those measurements differ from the 9/16-inch bore and M10×1.25 fittings on the Honda and Suzuki options, so use the specifications to distinguish it from those products.
Choose this if your Polaris model, year, side, and original-part dimensions match. Limitation: The fitment list includes model-specific exceptions, including the 2006 Sportsman X2 500; verify the exact trim before selecting.
Buying Guide: How to Choose a Front Brake Master Cylinder
How do I confirm fitment?
Start with the vehicle’s make, model, year, and trim. Compare all four details with the product’s stated applications, then check the original cylinder’s part number if available. A broad model-family name alone may not identify the correct part, because year and edition exclusions can apply.
Which measurements should I compare?
Check the handlebar size, piston bore, mirror-hole thread, and banjo-bolt thread. For example, the Honda and Suzuki options list a 9/16-inch bore and M10×1.25 connections, while the Polaris product lists a 3/4-inch bore and 10×1 mm banjo bolt. The EOPOAYI listing specifies an 8 mm mirror hole.
Does left or right side matter?
Yes. The Polaris product is identified as left front, while the EOPOAYI product is described as a right-side front brake pump. Confirm lever orientation and mounting position against the vehicle and original assembly rather than assuming that all front cylinders are interchangeable.
Should I choose by brand or OEM number?
Use an OEM number as a cross-check when one is provided, but confirm the vehicle application and physical dimensions too. The two Honda products list OEM number 45510-HR3-305, while the Suzuki option supplies fitment and measurements without an OEM number in the provided details.
Frequently Asked Questions
Are all front brake master cylinders interchangeable?
No. Fitment, bore size, thread dimensions, handlebar size, and side can differ. Match the replacement to the vehicle and original component.
What does the piston bore measurement tell me?
It identifies the listed bore size of the cylinder. Compare it with the original specification rather than assuming a different bore will work.
Can I use a GY6 cylinder on any scooter?
No. The EOPOAYI listing covers many GY6 vehicles but names specific exclusions. Check the exact scooter or vehicle model and mirror-hole size.
What should I verify before ordering?
Confirm the model year and trim, OEM or replacement part number, left or right orientation, handlebar size, bore, and bolt and mirror-hole threads.