Brake Master Cylinders
About Brake Master Cylinders
The master cylinder turns the pressure from your hand or foot into hydraulic pressure that pushes brake fluid toward the calipers. When its seals wear, the lever or pedal feels soft, sinks slowly, or the brake drags or does not release.
Master cylinders are listed for the front or rear, and are made for particular models, such as the Can-Am Outlander 450 and 1000 listed here. Many listings are front and rear master cylinder kits, and one is an ATV master cylinder in black. Read the listing to see whether the reservoir is part of the unit. You can either replace the cylinder or rebuild it with seals, and a rebuild only works if the bore is smooth. Either way, bleed the system afterward, and pick your machine in the Ride Finder at the top of the page.
Brands here include All Balls, Quad Logic and Shindy. For seals and repair parts, see Rebuild Kits & Parts. Related categories are Reservoirs, Caps & Covers, Brake Calipers & Brackets and Brake Lines, Hoses & Fittings, all part of Brakes & Brake Parts.
FAQs on UTV and ATV brake master cylinders
Should I replace or rebuild a master cylinder?
Rebuild it if the bore is smooth and the fault is worn seals. Replace it if the bore is scored or pitted, the body is damaged, or the unit has been leaking and corroded. If you are unsure, inspect the bore against the service manual.
What are the signs of a failing master cylinder?
A lever or pedal that sinks slowly under steady pressure, fluid leaking around the cylinder, or brakes that drag are common signs. Air in the lines, worn pads and leaking calipers can feel similar, so check the whole system.
Is the front master cylinder the same as the rear?
No. Front and rear cylinders are listed separately, and on many machines the front is worked by a lever and the rear by a pedal. Pick the right one for your model, and check the listing for the position.
Do I need to bleed the brakes after replacing a master cylinder?
Yes. A new or reassembled master cylinder lets air into the system, so the brake must be bled until the lever or pedal feels firm. Use the fluid type marked on the reservoir or in the manual.
