This might be a moot point, since it's not your car, but if the amount of brake dust is annoying, you might consider installing Kleen Wheels.

I hope this doesn't spark a religious debate.

I'd also check the condition of the lug nuts. Brand new ones are less than $3 each.

__________________
Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino