It's actually because the brake dust is darker in color. The OEM brake pad formulation of all german cars has a higher synthetic graphite content than other makes, that is why you get blacker wheels on BMW, Mercedes, Audi, etc than other cars.
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Ali Al-Chalabi
2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record
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