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      11-20-2012, 05:28 AM   #3
OzDriver
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Drives: '13 535i & '08 530i
Join Date: Oct 2012
Location: Sydney

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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.