The pistons in the original calipers were frozen and not repairable. I bought 2 new calipers from oh oh oh Oreilly. Do you have to place some type of grease between where the caliper and its bracket make contact (see picture). BTW the new calipers have the bleed screw and brake line connection in a different location but I think it will work. The piston on these original calipers can be adjusted with a 1 5/16 inch socket so you don't have to use the cheap rental tool with the small tits that bend or break off.