[s-cars] Brake light stays on.

[chris chambers]

Jack,

first check and make sure you have enough fluid in your resevoir, both
hydraulic and brake fluid. I attached the flush FAQ Fred Munro sent me.

After that you can try flushing your hydraulic system before replacing
the bomb. But it sounds like you need a new brake pressure accumulator
aka "the bomb". The cost for the part is ~ $225 and it'll take you
about 30 minutes to change it. Also budget a couple cans of hydraulic
fluid. There is a good write up on replacing the bomb here:
http://www.elektro.com/~audi/audi/bombrepl.html

HTH
Chris

--- Jack Gagnon <bullitt at gwi.net> wrote:

> Hello,
> 
> I am having trouble with my 92 S4.  The brake light does not go off
> no mater
> how long I run the car.  It used to stay on for 10-30 seconds in the
> morning
> and then stay off for the rest of the day.  It behaved like this for
> about
> two-three years of use.
> 
> Just yesterday, it decided to stay on for good and I don't have power
> brakes
> after the first or second application of the brakes.  I suspect the
> hydraulic pump, but the steering feels fine and I cracked the high
> pressure
> line and the fluid squirts out just fine.
> 
> Could it be a stuck valve pressure relief valve in the bomb?  Is it
> the
> servo in the master cylinder? or is it the pump.  I can feel the
> brake pedal
> pulsate a little when the assist is used up.
> 
> 
> I have a bad feeling that this on could cost me a lot of money if it
> is not
> diagnosed properly.
> 
> Any help is appreciated.
> 
> Thanks
> 
> Jack
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