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post #1 of (permalink) Old 02-13-2001, 01:18 PM
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Bronco Brake Problem

I have a 1989 Ford Bronco with rear anti-lock brakes. The brake pedal feels
fine until I start the engine. At that point the pedal goes to the floor. I have
replaced wheel cylinders, master cylinders, front calipers, put on new pads
and shoes, and front brake lines. The power brake booster seems to be okay
since the brake pedal fades slightly when started but then the pedal goes to
the floor afterwards. Air also escapes from the booster when I take the
vacuum hose off. I have bled all bleeders including the antilock bleeder till I'm
blue in the face with the same results. Good pedal til I start the engine. There
are no leaks anywhere. Any help you can give me will be greatly appreciated.

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post #2 of (permalink) Old 02-13-2001, 02:37 PM
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Re: Bronco Brake Problem

Sounds like a vacuum problem. Someone else on this board had the same problem about a year ago. They never posted the final result. Eric6=8 was in on the conversation, maybe he remembers the solution? Start checking for cracked/broken hoses.


post #3 of (permalink) Old 02-13-2001, 07:52 PM
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Re: Bronco Brake Problem

If the booster is making noise, I'd check it. And the pedal can't go to the floor unless the master cylinder isn't making pressure or the wheel cylinders aren't holding pressure. If the rear autoadjusters are locked and the shoes are worn, the pedal will go to the floor. Recheck all those. The Haynes manual has instructions.

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post #4 of (permalink) Old 02-14-2001, 09:31 PM
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Re: Bronco Brake Problem

I bench-bled the master cylinder until no more air was in the lines. Tonight I
tried another mastercylinder with the same results-good pedal untilI I start the
engine. I almost am now convinced that the problem must be in the power
booster, since I lose the brake pedal with the engine on. Thanks for your
response.I gotta get this fixed soon before the better half insists I get rid of it.
I read that they make a power booster that you have to adjust the rod on and
one that comes preadjusted. does anyone know if this is true or where the
best place to get one is.

post #5 of (permalink) Old 02-14-2001, 09:39 PM
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