Yep, it's all about brake lining selection. There is a tradeoff for high Mu linings = brake dust.
You can always look to switch to a ceramic pad :
http://zeckhausen.com/BMW/E92_M3.htm
Quote:
Originally Posted by i001947
I seriously cann't believe that BMW have not yet developed a way to prevent brake dust from accumulating on their great looking 19's rims by now. 
Nothing pisses me off than looking at my new M3 wheels and noticing how dirty they get just after 25 miles of stop and go driving. I've tried rim wax and sprays to prevent the built up of brake dust and nothing stops it.
I remember having this same problem with all of my BMWs (320i, 325i, 525i and 740i). And I do recall buying some brake shields for my 325i. They worked to prevent the dust from building up. But they made the rims heat up more a and they really didn't make the rims look nice at all.
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