brake pedal sticks down


Asked by Sep 08, 2016 at 10:02 AM about the 1994 Ford F-150 XLT 4WD Extended Cab LB

Question type: Maintenance & Repair

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

4 Answers

Kelly Mayo

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

Andrew Olsen

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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