Master Brake Cylinder Problems

Your car's master cylinder is the main component that operates the hydraulic brake functions, which allows you to stop when driving. Identifying and solving the problems that the master cylinder may have is essential for safety reasons.

Bypassing

Bypassing is a leak that occurs internally within the master cylinder. This is when brake fluid is being pumped into the front chamber out from the rear chamber and the rear reservoir would appear low on fluid. Bypassing can cause a low or sinking brake pedal feel. A defective sealing cup within the master cylinder would be responsible for this condition.

Seepage

Problems with your car's master cylinder would typically involve leaks or seepage. Because the master cylinder is mounted onto the brake booster, seepage may likely occur around the mounting area. A little seepage is normal. But should a lot of seepage occur, the master cylinder's secondary end seal may be defective.

Blocked Vent Port

You may have to overhaul the master cylinder with a kit if it has a blocked vent port. If the brake fluid is not allowed to escape when the brakes are released, it can heat up and cause the brakes to self-apply while you are driving.