Trying to install my rear brake pads. With the piston all the way seated back I still cannot get the caliper over the two new pads. I have plenty of clearance on the pad adjacent to the brake piston but the outer side of the caliper will not rotate down over the outer pad with the lower caliper pin bolt installed. Any hints? Only thing I can think of is that maybe my lower pin bolt is supposed to slide like the upper pin bold but doesn't because it is rusted or something. I've put rear brakes before on a 1996 Mustang and never had this problem. And yes....they are the correct pads. Any help would be greatly appreciated.