Cap for 3/4 inch hydraulic master cylinder

A replacement master cylinder cap designed to fit 3/4 inch size master cylinders securely. Avoid leaks and ensure optimal performance for your hydraulic trailer brakes.

Maintain trailer hydraulic brakes

We recommend you thoroughly bleed the brakes and flush through brake fluid before fitting a new cap onto your master cylinder in case the old cap failed and let dirt and debris into your trailer's brake lines.