i bough a set of amg double spoked wheels off of a 2005 S55. the front wheels hit up against my calipers. there is a bump on the caliper between the two pistons that would be nice to grind off but i'm not sure if brake fluid will come out, does any one know ? i bought spacers but now the lug nuts are too short, called ther dealer they only sell what i already have. Help please.