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Brake Problem (brake booster??)

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Brake Problem (brake booster??)

Old 10-31-2005, 11:54 AM
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Default Brake Problem (brake booster??)

Hello all,

I own a '96 A4 2.8, 107k miles and recently there is a problem that mysteriously comes and goes. Whenever there's slow traffic and it's a hot day (above 90 deg) while I'm driving (all 4 times it happened to me on the freeway), suddenly the break pedal gets extremely stiff, the car seems to have a trouble going forward, as if I was pressing the brakes and the gas simultaneously and I also get a smell of burning rubber... (brake pads??) When I manage to stop at the shoulder, turn off the engine for 2 minutes and turn it back on the brakes return to normal and I can drive the car again. The brakes work even when the pedal is stiff (if I press them hard the car stopts). My mechanic (although I don't believe he spent much time examining the car) said he can't see any problems with the brakes. I changed the brake pads 8 months ago, bleeded the whole system, everything was cool. No fault codes on the brakes, it seems this is a brake booster related problem but why it's happening only at high temp conditions? (I don't know that much of car engineering so...) Thank you all for your time,

Theodoros Zanos.
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Old 10-31-2005, 02:59 PM
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Default It could be the booster

Could also be the vacuum line running from the engine to the booster has sprung a sporadic leak. It runs through the bulkhead before the firewall so its easy to find.....check it for leaks and let us know.
Carson (K03x2) is offline  
Old 10-31-2005, 06:11 PM
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Default I've had an older Audi with the hydralic booster do that...

It was the booster, never seen it happen on a vaccum booster, but I don't think a vaccum leak would bind the brakes.
David.Norton is offline  
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