1912301 Rear Brake Master Cylinder for Polaris Sportsman 400 450 500 570 800

Rear Brake Master Cylinder for Polaris

This rear brake master cylinder for Polaris ATV models converts lever or pedal input into hydraulic pressure for the rear brake circuit, with OEM cross-reference 1912301 for straightforward matching.

Overview

The rear brake master cylinder for Polaris is a direct-fit hydraulic component that pressurizes brake fluid to engage the rear caliper. Built to match the original 1912301 specification, this rear brake master cylinder for Polaris restores consistent stopping power for trail, farm, and utility riders. It suits riders replacing a leaking or seized unit on Sportsman 400, 450, 500, 570, and 800 machines.

Built For Performance

• Cast body construction for reliable hydraulic pressure
• Precision bore sizing for consistent pedal or lever response
• Fits 1912301 mounting points without adapter hardware
• Seals designed for DOT brake fluid compatibility
• Reservoir and outlet ports configured to match the original layout

Fits These Machines

• for Polaris Sportsman 400
• for Polaris Sportsman 450
• for Polaris Sportsman 500
• for Polaris Sportsman 570
• for Polaris Sportsman 800

On-The-Job Use

• Rear brake service on Sportsman ATVs
• Trail and off-road riding
• Farm and property maintenance
• Hunting and utility work

Specs At A Glance

Good To Know

Q: Does this include the brake fluid? A: No, brake fluid is not included and must be added and bled after installation. Use the fluid type specified for your machine.

Q: Will this fit every year of the listed models? A: Fitment can vary by year and sub-model, so confirm the 1912301 number against your parts diagram before ordering.

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