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      10-19-2012, 02:50 PM   #709
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Sara504's Avatar

Drives: 2013 335is
Join Date: Aug 2007
Location: New Orleans

iTrader: (6)

Originally Posted by GRIP View Post
well I don't get what your question is then if you meant rust. Rust doesn't happen while the car is in use, and the brakes are being used. The surface rust happens when the car is sitting and the metal has time to react with moisture, and air. So when the car sit's up outside, that's exactly when rust will accumulate on the rotors, or anywhere else for that matter.
So then if I wash it, it should come right off, because its not coming off no matter how hard I scrub.....

I think Doc is having the same issue as me.. It looks like rust.. I could be brake dust but it looks like rust to me. It'll snap a pic to confirm later.