Join Date: Nov 2004
Location: Washington State, USA
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Best case scenario is a simple build up of brake dust. BMWs are notorious for this. Seen this same thing happen on a high mileage car. Sprayed EVERYTHING with a can of brake clean and then later blasted them again with a pressure washer... shudder gone.
1992 325ic *sold*
1984 320 *sold*
1986 325 5sp sedan, 175,000 Great car!
1986 535 5sp sedan, 172,000 Awesome!
1978 530 AT sedan, 275,000 still runs and drives
1997 740il AT sedan, 125,000 Like a newly wed!