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Old 09-05-2012, 03:06 PM   #35
Registered User
Join Date: Mar 2010
Location: Dallas, TX (USA)
Posts: 2,212
My Ride: E46 330i
Here's a nice (old) brembo vid:

But, to answer your question-
Faux brake covers restricts the amount of air flow through the rims spokes > causing the normal amount of dust produced from braking to collect on the wheels more quickly.
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