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      11-21-2012, 04:36 PM   #4
Private First Class

Drives: 2013 535i M-Sport Space Grey
Join Date: Sep 2012
Location: San Diego, CA

iTrader: (0)

Originally Posted by OzDriver View Post
Brake dust varies depending on the type of brakes, but usually includes carbon dust, iron particles, and adhesive residue. At high temps iron carbide can form, and it is an extremely abrasive material (it is used to surface cutting and grinding tools). The carbide can erode the clear coat protection on alloy wheels, allowing the iron particles to galvanicly corrode the alloy - resulting in pitting.
I never had this happen to any other rims. Anyone else have pitting on aftermarket rims? I would think that these wheel companies make the rims to resist this pitting.