Rear Brake Master Cylinder For Honda CR125R CR250R CRF250R CRF450R

Rear Brake Master Cylinder for Honda CR125R CR250R CRF250R CRF450R

This rear brake master cylinder is a direct replacement hydraulic pump that pressurizes brake fluid to actuate the rear caliper on for Honda CR125R, CR250R, CRF250R, and CRF450R motocross bikes.

Overview

This rear brake master cylinder restores reliable rear braking on for Honda CR125R, CR250R, CRF250R, and CRF450R models. It converts lever input into hydraulic pressure that drives the rear caliper, giving you consistent stopping power on the track or trail. Riders doing routine maintenance or a full brake system rebuild will find this rear brake master cylinder a practical direct-fit replacement.

Built For Performance

• Durable aluminum body built to handle high-pressure braking cycles
• Sealed internal piston and cup design keeps fluid contained under repeated use
• Threaded ports sized for standard banjo fittings on for Honda rear brake lines
• Reservoir mount points match factory frame and pedal linkage locations
• Corrosion-resistant exterior finish suited to mud, water, and dust exposure
• Direct-fit geometry for the listed CR and CRF models

Fits These Machines

• for Honda CR125R
• for Honda CR250R
• for Honda CRF250R
• for Honda CRF450R

On-The-Job Use

• Rear brake system replacement on motocross bikes
• Trail and off-road riding where rear brake control matters
• Track-day maintenance and brake system rebuilds
• Restoring rear braking after fluid loss or master cylinder failure

Specs At A Glance

Good To Know

Q: Does this come with a reservoir and lever? A: This listing covers the rear brake master cylinder unit itself, so check your existing reservoir, lever, and line fittings before installing. Reusing serviceable factory hardware is common during a master cylinder swap.

Q: Will I need to bleed the rear brake after installing it? A: Yes, any time a master cylinder is replaced the rear brake circuit must be bled to remove air. Use fresh DOT brake fluid and pump the pedal until it feels firm and consistent.

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