As JV suggested, any good wax on a clean wheel surface will help in the removal process, though short of "dustsless pads", nothing will reduce the brake dust cast-off process; those are big freaking brakes and they Work!
Another couple prods. to try:
Zaino combo of prods., which I use and find that the "release" ability is outstanding, eg, the crap comes off. Great on your paint,too:
http://www.zainostore.com/Merchant2/...tegory_Code=QO
Or, Wheel Wax, which was raved about by some here, though I have no exp. w/the prod:
http://www.wheelwax.com/
GL,md