GM 19303822
Rotor, Green Line

Begin work by placing the vehicle in a raised position above the ground while supporting it. Put j 41013 c-clamp over the brake caliper body but keep the ends against its back and Brake Pad area during installation. Press the c-clamp until the caliper piston gets compressed to 1mm (0.039 inch) but do not force more to protect brake parts and their working mechanism. Hydraulic brake hose safety depends on using mechanic's wire or an equivalent tool to support the brake caliper after you take off the c-clamp. Pull both the brake caliper and the caliper mounting bracket from the knuckle as one unit while maintaining the hydraulic brake hose in a relaxed state. Use the matchmarks to reposition the Brake Disc onto its wheel studs before taking it out. Use the wheel hub kit j 42450-a and rotor kit j 41013 to clean all rust and debris from the hub/axle flange and Brake Disc surfaces. Examine both sides of the Brake Disc surface before placing it correctly on the hub/axle flange by lining up matchmarks. When you replace brakes check the assembled lateral runout of the disc to see if it matches requirements; adjust the system if runout exceeds standards. Put back the brake assembly with caliper and bracket to the Steering Knuckle before fitting the tire and wheel assembly. The new brake pads need to be run-in with the refinished or replaced Brake Disc through routine operation.

To replace the rear Brake Disc, raise and support the vehicle, first. Take off the tire and the wheel assembly. Using a large c-clamp (J 41013), press down on the Brake Caliper Piston, but should not exceed 1 mm(0.039 in) to crush the internal adjusting component. Once compressing the piston, take off the c-clamp and the brake caliper bracket bolts. Care for the brake caliper by supporting it with heavy mechanic wire to avoid damaging the hydraulic flexible brake hose. Take off the brake caliper and bracket components, and if present, dispose of the Brake Disc retainers. If replacing your original Brake Disc, measure the position of the Brake Disc in relation to the Wheel Hub before removing it. Clean the hub/axle flange free of anything by using the Wheel Hub resurfacing kit (J 42450-A) and clear the Brake Disc by using the rotor resurfacing kit (J 41013) if required. Check the mating surfaces for debris then install the Brake Disc aligning it as stated in the process of removal. If the disc was disassembled for repair, check for assembled lateral runout (LRO) and correct it if it is more than what is specified. Lastly, place the brake caliper bracket assembly on the wheel knuckle, and install and tighten the brake caliper bracket bolts to 115 n.m (85 lb ft), replace the tire and wheel assembly, lower the vehicle and, where applicable, burnish the pads and the discs.

Remove the brake caliper bolts and detach the brake caliper assembly from the steering knuckle, supporting it with heavy mechanic wire.

Use the Wheel Hub Resurfacing Kit (J 42450-A) for the hub/axle flange and the Rotor Resurfacing Kit (J 41013) for the brake rotor.

Adjust accordingly.

Remove the C-clamp and support the brake caliper with heavy mechanic's wire to prevent strain on the hydraulic brake flexible hose.

Inspect the mating surfaces to ensure they are free of debris.

Clean any rust or contaminants using the Wheel Hub Resurfacing Kit (J 42450-A) and the Rotor Resurfacing Kit (J 41013).

The mating surfaces to ensure they are free of debris.

Gently remove the rotor by rotating it if necessary.

Remove the brake caliper and caliper mounting bracket as an assembly from the steering knuckle.

Measure the assembled lateral runout (LRO) of the brake rotor; if it exceeds specifications, adjust accordingly.

Remove the brake caliper bracket bolts and support the brake caliper with heavy mechanic wire to prevent damage to the hydraulic flexible brake hose.

Reinstall the brake caliper mounting bracket and caliper assembly to the suspension knuckle.

Use the Wheel Hub Resurfacing Kit (J 42450-A) and the Rotor Resurfacing Kit (J 41013) to clean the mating surfaces and inspect for foreign particles.