There is a good chance that this problem is caused by either a hose that is faulty, or a proportioning valve that is sticking. It might be the brake booster or the pedal itself, but that is not as likely. This happens when the brake booster push rod is adjusted out too far which does no allow the brake master to return fully holding the brakes on. To confirm the issue loosen the brake master mounting bolts 3 turns to see if the car starts to roll again, if so remove the master and adjust the booster push rod inward. Also a brake flex hose can come apart internally causing a short of check valve in the system but this is usually isolated to one brake either front or rear.
Wednesday, September 21st, 2011 AT 10:15 PM