To swap out the rear brake caliper, first check the level of fluid in the reservoir of the brake master cylinder. If it is over then on the midway point between maximum-full and minimum allowable level, remove fluid to get to midway. Lift and support the vehicle, then unmount the tire and wheel assembly. Inflate the brake caliper pistons with a large c-clamp over the caliper housing top on the outboard pad rear. Tighten the clamp until pistons are moved out completely. Clean the end of the brake hose and attach a rubber cap or plug to the exposed end of the brake pipe fitting to avoid fluid leak and contamination prior to the removal of the brake hose to caliper bolt. Pop the 2 copper brake hose gaskets which might still be attached to the caliper housing or hose end and pull off the brake caliper by removing the caliper guide pin bolts. Check the caliper assembly, and when installing new
Brake Pads, then will require you to clean the outside part of the caliper boots employing denatured alcohol and compressing pistons by the use of a c-clamp protected by a layer or a barrier. Raise the inner edge of the caliper boots to remove trapped air, allowing them to remain below the face level of the piston. Install the brake caliper onto the mounting bracket, clean the threads of the caliper guide pin bolts with brake parts cleaner, apply the threadlocker gm p/n 12345493 (Canadian P/N 10953488) followed by installing and tightening them with the guide pin bolts to 34 nm (25 ft. Lbs) for the 15 series or 72 nm (53 ft. Lbs) for the 25/35 series. Remove the rubber cap or plug, fit 2 new copper brake hose gaskets into place and connect the brake hose to the caliper bolt tighten brake hose to caliper bolt to 40 nm (30 ft. Lbs). Bleed the hydraulic brake system, remount the tire and wheel, lower the vehicle, and charge the master cylinder reservoir to the correct level with fresh brake fluid.