GM 18043519
Mount Bracket, Rear

The replacement of the rear Brake Caliper Bracket (except 35 Series) begins with checking the brake master cylinder reservoir fluid levels. Fluid removal from the reservoir is necessary when fluid levels reach beyond the midpoint separating maximum-full and minimum allowable limits. Place the vehicle on supports then take off the tire and wheel assembly. The check for caliper function should begin with using a c-clamp to keeping both brake caliper pistons in equal compression. Use heavy gauge wire to suspend the caliper from the vehicle frame after you disconnect the caliper from its bracket using caliper mounting bolts. The evaluation of the caliper and bracket begins after removing brake pads and anti-rattle clips from the mounting bracket followed by Brake Caliper Bracket mounting bolt extraction. During installation position the brake pads together with anti-rattle clips onto the mounting bracket. Before installing the caliper bracket mounting bolts, remove any original adhesive, clean the bolt threads with brake parts cleaner, and apply threadlocker gm p/n 12345493 or red loctite tm #272. Mount the caliper bracket first before tightening its mounting bolts to 200 nm for jc5/jh5 systems or 165 nm for jh6 systems. For jc5/jh5 systems tighten the brake caliper mounting bolts to 42 nm (31 ft. Lbs.) while jh6 systems require 108 nm (80 ft. Lbs.). To release trapped air from the rubber boot you should gently move its edges against the caliper housing. Reinstall the tire-wheel assembly while you remove safety stands before lowering the vehicle down. When the engine is off apply the brake pedal gradually to reach two-thirds of its total length before letting it go. Perform this procedure two more times followed by a firm pedal check to allow correct pad and piston position within the caliper. End the procedure by adding the right amount of clean brake fluid into the master cylinder reservoir.

Raise and support the vehicle, then remove the tire and wheel assembly.

Pump the brake pedal slowly and firmly to seat the brake pads.

Place the new brake caliper bracket, ensuring to remove any original adhesive and clean the bolt threads with denatured alcohol before applying Threadlocker GM P/N 12345493 (Canadian P/N 10953488) to the threads.

Attach the anti-rattle clips and brake pads.

Tighten them to 300 Nm (221 ft. lbs.).

Raise and support the vehicle, then remove the tire and wheel assembly.

Fill the master cylinder reservoir to the correct level with clean brake fluid if needed.