Question about 1992 Audi 80

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Hesitation in acceleration on my 92 audi 80 quatto

My brakes pedal is hard..which i figured it would be the brake booster causing a vacuum leak and my hard pedal problem. But i replaced the booster that i got off a low miles not rusted same model as my car. The used brake booster didnt cure my hesitation and hard predal problem..
I can also hear a pffff sound of air every time i take my foot off the brake pedal.. Im just asking if a faulty brake booster would cause a serious hesitation...And if i were to smoke test the brake booster...the smoke should not get into the cabin of the car..right?

Posted by jsawdey on

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Run the car fo a while. Turn it off and wait about 30 seconds. Pull the hose off the booster. You will hear a loud rush of air entering the booster to fill the void. If not the booster is leaking. It will also cause all sorts of idle and off-idle acceleration problems. Did you check the hose from the engine to the booster? Was there a chack valve in the line too?

Posted on Feb 06, 2010

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Hi, your basic symptoms will be. Your brake pedal. Will be very hard to push. When the pedal is engaged there will be a large vacuum leak, usually causing the engine to be very ruff or stall. If its bad enuff, youll hear the the air leak when pedal is depressed, hope that helps.

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You can only have whatever the engine vacuum is
at any time.
Is there vacuum to the booster check valve
& is the valve working,assuming you have the
old one or a new one with the new booster.
Does fluid flow out all 4 corners?
Are the Rubber Flex Hoses Collaped
Calipers Rusted & frozen?
Did you remove the master & clean out
the moisture from around the piston
That is where you start,then flush & on to
every component in the system, if they are
on the vehicle for many years
You do realize brake fluid gets changed every
2 years on all vehicles or you got big problems with
moisture in years to come

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Have the brakes checked asap. the brake system may have a leak causing the pedal to go low. check the fluid level and if it is low or empty then there is a problem, could be a rotted brake line leaking or a wheel cylinder leaking.

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