In order to overhaul the front brake caliper (j55), one should first unmount the brake caliper from the vehicle without intrusion of fingers in front of the
Piston with the application of compressed air in order to prevent injury. Then, unfasten the Brake Caliper Piston using the brake caliper inlet hole and press out the Brake Caliper Piston; apply loctite(R) on the back of the caliper. Exercise caution taking out the Piston boot and seal, use a wee plastic or wood tool to protect against damage to the caliper bore or seal groove. Go ahead and remove the Piston boots and seals, followed by the brake caliper bleeder valve and cap. Do not clean the Brake Caliper Piston using abrasives. Rather, clean the Piston bore, seal counterbore and Piston with denatured alcohol or equal and dry it with non-lubricated filtered air. Check the brake caliper parts for scoring, nicks, or cracks, wear, or corrosion and change the pistons if there is noticeable damage and polish out light caliper bore corrosion using crocus cloth with change of caliper in case. Examine the seal groove in the caliper bore for nicks or burrs and caliper replacement if the caliper is present. Replace the brake caliper bleeder valve and the cap, then lubricate the new Piston seal with delco supreme 11(R) gm p/n 12377967 or equivalent dot-3 brake fluid from a clean sealed container prior to installation of the lubricated new Piston seals into caliper bores. Use a caliper Piston dust boot seal installer or an equivalent tool to full seat the dust boot seal for the determined 71.96mm (2.833 inch) counterbore and 56.5mm (2.224 inch) piston bore diameter. Finally, put the brake caliper back on the vehicle.