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      07-08-2008, 11:43 AM   #2
Gearhead999s
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Drives: E93 335is(wifes)E92 M3
Join Date: Apr 2007
Location: Toronto

Posts: 6,699
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I have the same thing and I beleive its wash down from the brake rotors and pads.I have cleaned the wheels once off the car when I had my track tires on and its shown up again after a few weeks and washes.I now intend to keep my wheels bathed in brake dust from enjoying the car,so I do not notice the rust runoff
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