Polaris Rear Brake Caliper and Master Cylinder Assembly
Updated June 9, 2026
This is a combined rear brake caliper and master cylinder assembly designed for select Polaris ATV and UTV models. It integrates the hydraulic master cylinder that generates brake pressure with the caliper that clamps the brake pads against the disc, providing reliable rear braking force. It is a direct OEM replacement for the original unit.
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How It Works
The master cylinder houses a piston that pressurizes brake fluid when the rear brake lever is applied. This hydraulic pressure travels through the brake line to the caliper, where it forces the caliper pistons to push the brake pads against the rear disc rotor, creating friction to slow the vehicle. The assembly is pre-assembled for easy installation and includes the necessary ports and seals for quick connection to the existing brake system.
Common Failure Symptoms
Symptoms of a faulty rear brake caliper or master cylinder include a spongy or soft brake lever, brake fluid leaks near the rear wheel or master cylinder, reduced braking power, uneven brake pad wear, or the rear brake dragging. Often these issues are caused by internal seal failure, corrosion, or damage to the master cylinder or caliper piston.
Installation Notes
Installation typically involves removing the old caliper and master cylinder unit, attaching the new assembly to the frame and rear axle, and connecting the brake line. The system must be bled after installation to remove air from the hydraulic circuit. Verify compatibility with your specific Polaris model and year, as this assembly is designed for select models including Trail Blazer, Scrambler, Sportsman, and Trail Boss, but excludes some variants like 6x6. Always use new copper washers and brake fluid meeting DOT 3 or DOT 4 specifications.
