Hissing Sound until brakes are applied - 1987 Audi 5000 Quattro

[BRIT4VWS at aol.com]

In a message dated 06/07/2001 04:23:17 PM Mountain Daylight Time, 
autolit at bmts.com writes:


Hi All

New problem today.

With the engine running, there is a hissing type of sound coming from near
the top of the brake pedal.  Step on the brake pedal and the sound goes
away.

I have the Bentley for my car, but I can't seem to find where there may be a
vacuum hose or what ever that is leaking.

I have dug around in there, but can't find where the leak is as of yet.  It
is definitely right close to the brake pedal.

Any ideas?

Thanks



Vacuum leak in your Brake booster diaphragm.  I have scene it many times on 
other makes and models and the boosters are almost all the same.  I bet that 
is your problem and your car will probably run better when you are done.

Britton Ingraham

1987 4000 CS quattro
1986 Quantum
1973 Beetle
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