To begin the service process for a rear disc brake caliper, push down on the brake pedal until it feels like you've pressed it 1 inch, then use a brake pedal depressor so no brake fluid leaks from the reservoir. Get the vehicle up on jacks and pull out the rear wheel and tire. Disconnect the hose from the caliper by removing the banjo bolt and discarding the pair of washers that slide off with it. Take out the two guide pin bolts holding the caliper to the adapter, then rotate the caliper and pull it off the lower machined abutment. Cleansing and inspecting the caliper should be the first step before you begin unscrewing it. Twist the bushing on the guide pin toward the back of the case and slip it out with the help of your fingertips and perform this action also on the opposite bushing. Hang the caliper off a wire hook away from the rotor and body, insert a piece of wood between the fingers of the caliper and
Piston and gently push the brake pedal to pull the piston out. Hold the brake pedal down so that fluid doesn't drain out. After that, disconnect the brake fluid flex hose. Place the caliper between the jaws of a vise, remove and throw out the piston dust boot and then carefully extract the old piston seal from the cylinder bore with a soft tool. Carefully inspect and clean the piston bore and if you see minor scratches, use crocus cloth on it. When you clean the brake parts, spray them with water using a timely cloth, gather up any waste and store it in a secured container labeled as hazardous. Brush liberal strokes of Mopers Dielectric Grease inside the bushing and slide it into the caliper boss so that its half unfolded. Introduce clean brake fluid into a new piston seal and slide it into place in the groove, then coat a new piston boot with brake fluid and set it over the piston. Subject the piston to even pressure so that it fits in the cylinder bore, then use Tool C-4689 or C-4842 and Handle C-4171 as needed to put on the dust boot in the counterbore. Put the caliper back on the car, with its piston fully retracted, add grease to the adapter holes and if taken out, install the rotor directly onto the hub's center. Lower the brake shoes and caliper on top of the rotor, but don't damage the guide pin bushings or sleeves. Place the caliper guide pin bolts and tighten them to 22 Nm (192 inch lbs.). Afterward, place the brake hose with new washers and fasten them with a tightened banjo bolt which should be tightened to 35 Nm (26 ft.lbs.). After reinstalling the wheel and tire, tighten the stud nuts just halfway, then torque to 135 Nm (100 ft. lbs.) when done. Prop up the vehicle, free the brake pedal depressor, bleed the hydraulic brake line and test the brakes on the road.