So I have a question. I just installed new calipers on my 80 pickup. When I put my wheels on they rub on a raised section of the caliper. They are A-1 Cardone calipers. Does anyone know if I can just grind that raised piece down or is it sonething other than cosmetic? It looks like it may have something to do with the pistons. I have the cals that are dual piston.