Brake Master Cylinder - Compensator Port

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the master cylinder. Refer to Brake System Inspection .
With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING .
Apply and release the brakes.
With the brakes released, attempt to rotate each wheel and check for any brake drag.
- If an excessive amount of brake drag exists at multiple wheels, continue to Step 5.
- If an excessive amount of brake drag exists at only one wheel, it indicates a possible seized brake caliper, brake wheel cylinder or parking brake component. Repair or install new components as necessary.
Check the brake stoplamp switch and the brake pedal free play to verify that the brake pedal is not partially applied.
Loosen the brake master cylinder nuts and position the brake master cylinder away from the brake booster.
With the brakes released, attempt to rotate each wheel and check for any brake drag.
- If the brake drag is no longer present, install a new brake booster. Refer to POWER BRAKE ACTUATION .
- If the brake drag is still present, install a new master cylinder. Refer to HYDRAULIC BRAKE ACTUATION .