GM 19303821
Rotor, Rear

To replace the rear Brake Disc, first lift and support the vehicle. Follow it up by removing the tire and wheel assembly. Use heavy mechanic's wire to support the brake caliper so as to avoid spoiling the hydraulic flexible brake hose when removal caliper bracket bolts. Next, remove the brake caliper and caliper mounting bracket assembly from the suspension knuckle, not putting any pressure on the hydraulic brake flexible hose. Take off the Brake Disc retaining screw and then the Brake Disc, remove it off rotating it gently if necessary. Remove any rust or contaminants from the hub/axle flange and Brake Disc mating surfaces using wheel hub resurfacing kit (J 42450-A) and the rotor resurfacing kit, (J 41013). Check the mating surfaces for any foreign matter or debris prior to fitting the new Brake Disc on the hub / axle flange. Mount the Brake Disc retaining screw and tighten it to 10 nm (89 inch lbs.). If the Brake Disc was removed while working out on a brake system repair, then it would be wise to determine the assembled lateral run out (LRO) and do so to ensure optimal disc brake performance. If the lro is above the specification, adjust it appropriately. Finally, install the brake caliper and the caliper bracket assembly on the suspension knuckle, and install a tire and wheel assembly, and lower the vehicle down and burnish the pads and discs as applicable.

Raising your vehicle and supporting it underneath marks the first step to replace the rear Brake Disc. Take off the tire and wheel setup. Hook up heavy mechanic wire or an alternative to support the brake caliper whenever you disconnect it at the mount position during maintenance on the hydraulic flexible brake hose to avoid damage. Use a wrench to remove the caliper bracket bolts then take out the brake caliper assembly and its bracket together from the knuckle while keeping hydraulic brake tension off the hose. Use a socket to take out the Brake Disc retaining screw. When needed pull the disc straight out while gently turning it. Before installing parts you must scrub off rust or dirt from both hub/axle flange and Brake Disc contact surfaces using tools from wheel hub resurfacing kit (J 42450-A) and rotor resurfacing kit (J 41013). Put the Brake Disc onto the hub/axle flange and attach it with its screw. Secure the screw tightly to 10 n.m. Take measurements of the brake system when the Brake Disc was replaced during service to verify if it runs level. Adjust if necessary to meet brake system standards. Put the brake caliper and Brake Caliper Bracket onto the suspension knuckle and fit back the tire and wheel parts. Drop the vehicle and perform pad and disc burnishing if the step is needed.

If applicable, measure the assembled lateral runout (LRO) of the brake rotor to ensure optimal performance, and correct it if it exceeds specifications.

Install the brake rotor onto the hub/axle flange and tighten the retaining screw to 10 N.m (89 lb in).

Take off the brake caliper and caliper mounting bracket as an assembly from the suspension knuckle, ensuring no tension on the hydraulic brake flexible hose.