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RE: The pedal is hard with the engine off.....
If the above is a correct statement, and with the engine off you actually have a rock hard pedal that goes hard when pushed about an inch or two down, then your brake system is holding pressure and you can do no more with the hydraulic end of things, that was taken care of by you, and maybe even in the garage you took it to, although I doubt they did anything except charge you. I'm still surprised and troubled that the mechanic let you drive the car and didn't tell you what the rest of the problem was. In most states it is a law that a mechanic can't release a car with questionable brakes to the customer, even if the customer demands the vehicle. That part of this drama troubles me, because it sounds like the car is not really safe to drive. The brake booster is probably the culprit so that when you are running the engine you are not getting any power assist, so it is very difficult to stop the car, you have to press the pedal very hard and it feels like you are pushing the pedal to the floor. I would suggest you look closely at the brake booster, especially the vaccuum source that operates it. Make sure there is vaccumm at the booster and that the large diameter vaccumm hose that supplies the booster is not plugged or capped off. I really don't know if your engine has a seperate vaccuum pump which may be bad and not creating enough vaccuum, or if your booster is getting vaccuum directly from the intake manifold. I don't know what else to tell you to look at, please let us know what the final fix is.
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Time flies like an arrow.... Fruit flies like a banana!
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