[s-cars] Fix for that annoying UrS "brake" warning light on start-up

[Aaron]

Hi Fred
I know im due for such a service.
I dont know if there is any good info in the archive but as this is
seems to be a common issue Im sure I would be put to good use.
Aaron

Fred Munro wrote:

>	I had a couple of minor annoyances on my '94 S4.
>
> 	One was the red "brake" warning light coming on in the morning for 20
>seconds or so after the car sat overnight. This is a common problem with the
>UrS cars and indicates the bomb has bled off pressure overnight. The light
>stays on until the bomb is back up to pressure. In my case the problem got
>worse until the light would come on after the car sat for only a few hours
>and stay on for 40 seconds or so. The bomb was losing pressure rapidly
>(leaking internal check valve) and was taking longer to recharge. Time for
>action!
>
>	The other little problem was a "dead" spot on-centre in the steering feel.
>There was no feel and no steering feedback. It felt like a loose tie rod
>end, but all suspension components were tight. I adjusted the rack preload
>to no avail. This made the car rather unpleasant to drive, as it felt quite
>"loose".
>
>I resolved both these problems with one "fix". The brake light never comes
>on now, even after the car has been sitting for several days. Steering feel
>is back to normal.
>
>What is this miracle fix?
>
>I drained & replaced the Pentosin and cleaned the reservoir strainer. As a
>point of interest, I got 48 pumps out of my 9 year old bomb.
>
>The old oil was black as pitch. I suspect the new oil has cleaned out the
>bomb check valve, restoring it's functionality, and cleaned out the rack
>valving, evening out steering boost.
>
>I'll put together a flush "how-to" with a couple of photos if anyone is
>interested.
>
>Fred Munro
>'94 S4 (no longer annoyed)
>
>
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