brake pedal sticks down
old FORD F-150 - with engine off, pumped brakes many times. Kept foot pressure on brake pedal and started engine. Brake pedal sinks considerably (inches). Is this alone enough to conclude that the brake booster has to be replaced? this is s 1994
yes it is...while your at it put up a combo booster/master cyl in it and replace both..... unless the master is fresh or been replaced
Master cylinder is internaly leaking. If the booster goes out you lose power assist. It's only doing it started I'm assuming because with the power assist you now have enough force to overcome the seals. If the rear of the master cylinder is leaking into the booster then it is nessesary to replace both
I'm betting on the master cylinder, I think there is air in it for whatever reason. I will report back after replacing it. I doubt it is the booster.
repjlaced master cylinder and the problem remains. I may start looking at the ABS system for answers
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