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AMEDEE
AMEDEE, FORD TECHNICIAN
Category: Ford
Satisfied Customers: 24409
Experience:  ASE CERTIFIED TECHNICIAN ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
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brakes fade while holding at stop or on hills..master cylinder..leaks

Resolved Question:

brakes fade while holding at stop or on hills I have replaced master cylinder no improvement 110,000 mi , no fluid leaks, no codes on computer
Submitted: 6 years ago.
Category: Ford
Expert:  AMEDEE replied 6 years ago.
Hello!

You could have bad caliper slides binding up causing your problem or even a loose wheel bearing. The caliper slides can bend when you are pushing down on the brake pedal or the wheel bearing can move causing the brake pedal to appear low or spongy.

I would recommend to diagnose the problem. You are going to have to pin point what is causing the spongy pedal. This is done by clamping off all four brake lines at the hoses by each wheel. Start the vehicle up and check the pedal. Chances are that it is nice and firm. If it is not, the master cylinder is at fault and will need to be replaced (or there is simply air in the system). If the brake pedal is nice and firm, disconnect the clamps one by one and see what makes the most difference when doing this. If its in the front, than the calipers will need to be replaced (sometimes one of the caliper slides stick and the other one is free witch causes the caliper to flex when stepping on the pedal and results in a spongy pedal.) If its in the rear than something may be broke or they are way out of adjustment!
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