OTOHANS AUTOMOTIVE 7/8" Brake Master Cylinder Reservoir Kit for Honda TRX/Foreman — Right Front Assembly with Switches

OTOHANS AUTOMOTIVE replacement 7/8" brake master cylinder reservoir is a complete plug-and-play front brake master cylinder kit built to restore hydraulic feel and stop-by-stop reliability on compatible Honda, Yamaha, Kawasaki and Suzuki ATVs and motorcycles.

This replacement master cylinder assembly is designed for owners who need a direct-fit, durable solution for worn or leaking brake reservoirs and master cylinders. The kit is manufactured with upgraded materials, a cast piston return spring, and brand-new internal components to minimize fluid bypass and maintain stable braking performance after repeated use. It arrives as a full assembly with the right front master cylinder and both right and left disc brake switches, making installation straightforward for most mechanically inclined riders.

Which vehicles does this master cylinder fit?

This OTOHANS unit covers a wide range of Honda and other models when the 7/8" bore and reservoir configuration match your vehicle. Always cross-check the OEM part numbers and your vehicle’s manual to confirm fitment before purchase.

• OEM replacement numbers included: 45510-HM3-901, 45510-HM4-306, 45510-HBM3-305, 2FM-FTVMC001
• Common compatible Honda models: TRX 250–700 series, Foreman 400–500, FourTrax 125–350, Rancher 350–420, Rincon 650–680, Sportrax 90–450
• Also used on vintage and other models: ATC200X–350X, FL250–400R, CX500, CB750, FT500, GL500
• Verify compatibility using the vehicle manual or parts diagram prior to ordering

How does this replacement improve braking performance?

The kit replaces worn seals and obsolete components that allow fluid bypass and spongy lever feel. Upgraded materials and a new cast piston return spring restore a firmer, more consistent lever response after repeated brake cycles.

• New internal seals reduce fluid leakage under pressure
• Cast piston return spring improves return speed and consistency
• Multiple-cycle bench testing for stability across temperatures
• Includes brake switches to restore electrical brake functions

What comes in the box and what tools are required?

The OTOHANS kit ships as a ready-to-install assembly to minimize parts hunting and reduce install time. Basic hand tools and brake-bleeding equipment are necessary for a correct installation and safe operation.

• Included: 1x right front brake master cylinder assembly, 1x right disc brake switch, 1x left disc brake switch
• Tools typically required: wrenches, screwdrivers, pliers, brake-fluid reservoir caps, and a bleed kit
• Recommended: fresh DOT-spec brake fluid and a service manual for torque specs
• Installation is plug-and-play for experienced DIYers but professional installation is an option

Are there maintenance tips or compatibility warnings I should know?

Routine inspection and correct fluid selection prolong the life of the master cylinder and keep brakes operating as intended. Avoid mixing fluid types and check electrical switches for proper function after installation.

• Use the brake fluid type specified in your vehicle manual (do not mix DOT types)
• Inspect lines and banjo fittings for corrosion before assembly
• Bleed the system thoroughly to remove air pockets after installation
• Test all brake switches and lever travel in a safe area before riding

Who is this for: This OTOHANS 7/8" master cylinder reservoir kit is aimed at ATV and motorcycle owners, restoration specialists, and mechanics who need a direct OEM-number-compatible replacement with improved internal components. It suits riders restoring older machines or upgrading unreliable original equipment; verify OEM part numbers and model fitment before buying. If you need help confirming compatibility or have technical questions, the OTOHANS support team is available to assist.