A4 ABS and Brake warning lights

[Bob]

Identical symptoms on my systers 98 A4 (2.8).  Problem wound up being a 
ton of rust particles were stuck to the magnetic ABS pickup sensors at 
each wheel. It all started after a brake change, and it seems it knocked 
free a lot of rust from the 'gear' on the axle. After cleaning them off 
all was well again, but it came back after a week or so. When I cleaned 
it out I used compressed air, should have used a vacuum, I know there 
was still a ton of crap down in there.

Bob

alan page wrote:

>Hello,
>
>A friends '98 A4 1.8T displayed both the ABS and Brake warning 
>lights (with the audible warning) recently and she had her 
>mechanic look at it immediately. He checked the entire braking 
>system and couldn't find anything wrong, and the lights were off by 
>the time he looked at it. Since then, it has happened several more 
>times, and each time she has no trouble stopping the car.
>
>She's going to have either another mechanic or the dealer look at 
>it, but I can't figure out what type of failure would cause all three of 
>these indicators to go off at the same time. If an ABS sensor were 
>bad or one of the sensor wires were intermittent, wouldn't the ABS 
>light be the only one on?
>
>Thanks,
>Alan
>Newtown, CT USA
>'90 80q
>'94 S4
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