I am going to change my brake pads soon and I'll probably need to push the piston back in for clearance. Will these c-clamps work? c-clamps on ebay I think they will do the job but I just want to make sure before I buy them. Also another thing, are the fronts and rears the same as far as pushing the piston back in? Some cars require a #3 Phillips screwdriver or something like that for the rear pistons. Thanks in advance.