US Rear Brake Master Cylinder Pump For 110cc/125cc/140cc ATV Dirt Pit Bike

Rear Brake Master Cylinder Pump for 110cc 125cc 140cc ATV Dirt Pit Bikes

This US rear brake master cylinder pump is a hydraulic replacement unit for 110cc, 125cc, and 140cc ATV and dirt pit bikes, translating rear lever input into fluid pressure that drives the caliper for controlled braking.

Overview

This rear brake master cylinder pump is a hydraulic assembly made to replace a worn or failing rear master cylinder on 110cc, 125cc, and 140cc ATV and dirt pit bikes. The rear brake master cylinder pump pressurizes brake fluid so the rear caliper clamps the rotor with steady, predictable force. Riders and shops servicing small-displacement ATV and pit bike rear brakes will find it a practical replacement part.

Built For Performance

• Rear-mounted hydraulic master cylinder configured for 110cc to 140cc brake systems
• Piston and seal assembly designed to hold line pressure across repeated lever strokes
• Reservoir and body shaped to match common ATV and pit bike mounting points
• Pushrod and lever interface built for smooth, repeatable engagement
• Exterior finish helps resist corrosion from mud, water, and trail grit

Fits These Machines

• for 110cc ATVs
• for 125cc ATVs
• for 140cc ATVs
• for 110cc dirt pit bikes
• for 125cc dirt pit bikes
• for 140cc dirt pit bikes

On-The-Job Use

• Rear brake service on 110cc to 140cc ATVs and pit bikes
• Trail riding where steady rear braking is needed
• Track and practice sessions on small-displacement pit bikes
• Shop inventory for routine hydraulic brake repairs

Specs At A Glance

Good To Know

Q: Will this rear master cylinder bolt straight onto my ATV or pit bike? A: Compare the mounting holes, hose fitting, and lever position on your existing rear master cylinder with this unit before ordering. Matching those details confirms the rear brake master cylinder pump suits your 110cc to 140cc machine.

Q: What else do I need to install this master cylinder? A: Plan on fresh DOT brake fluid and a bleed of the rear system after installation. The part ships dry, so bench bleeding the master cylinder first helps you get a firm lever faster.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.