GM 10445858 Rear Brake Rotor Assembly

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Loosen the wheel lug nuts, raise the vehicle, and support it securely on jackstands. Remove the brake caliper without disconnecting the brake hose, and suspend it out of the way with a piece of wire, ensuring it does not hang by the brake hose. Inspect the disc surface for score marks and other damage; light scratches and shallow grooves are normal, but deep scoring requires disc removal and refinishing by an automotive machine shop. Check both sides of the disc, and if pulsating occurs during brake application, suspect disc runout. To check runout, reinstall the lug nuts inverted and place a dial indicator about 1/2-inch from the outer edge of the disc, setting the indicator to zero before turning the disc. The reading should not exceed the specified allowable runout limit; if it does, the disc should be refinished. If not resurfacing, remove the glaze from the surface with emery cloth or sandpaper using a swirling motion. It is critical that the disc not be machined to a thickness under the specified minimum, which can be checked with a micrometer. For removal, on sliding caliper models, remove the caliper mounting bracket or, on fixed caliper models, the caliper mounting bolts, and also remove the lug nuts if they were reinstalled. Use diagonal cutters to cut the brake disc retainers around the studs if equipped, noting that replacement of these retainers is not necessary during reassembly. While the disc is off, wire-brush the backside of the center portion that contacts the wheel hub and clean any rust or dirt on the hub face. Apply small dots of high-temperature anti-seize around the circumference of the hub and the raised center portion. Position the disc over the threaded studs, install the disc retaining screw, and tighten it to the specified torque values. Install the caliper mounting bracket and caliper, tightening the bolts to the specified torque values. Reinstall the wheel, lower the vehicle to the ground, and tighten the lug nuts to the specified torque. Depress the brake pedal a few times to bring the brake pads into contact with the disc, and bleeding will not be necessary unless the brake hose was disconnected. Finally, check the operation of the brakes carefully before driving the vehicle.