Loosen the wheel lug nuts, raise the vehicle, and support it securely on jackstands. Remove the wheel and install the lug nuts to hold the disc in place, releasing the parking brake if working on the rear brake disc. Remove the
Brake Caliper without disconnecting the brake hose, suspending it out of the way with a piece of wire. Remove the caliper bracket bolts and take off the bracket. Visually inspect the disc surface for score marks and other damage; light scratches and shallow grooves are normal, but deep scoring over 0.039-inch requires disc removal and refinishing. Check both sides of the disc, and if pulsating occurs during brake application, suspect disc runout. To check runout, place a dial indicator about 1/2-inch from the outer edge of the disc, set it to zero, and turn the disc, ensuring the reading does not exceed the allowable runout limit. Professionals recommend resurfacing the discs whenever the pads are replaced to ensure a smooth finish and eliminate brake pedal pulsation. If not resurfacing, remove the glaze from the surface with sandpaper or emery cloth using a swirling motion. Ensure the disc is not machined to a thickness under the specified minimum allowable refinish thickness, which can be checked with a micrometer. Remove the lug nuts that were used to hold the disc in place, take out the Phillips-head screws from the disc, and slide the disc off the hub. Place the new disc in position over the threaded studs, install the caliper, and tighten the bolts to the specified torque, bleeding only if the brake hose was disconnected. For rear discs, check the adjustment of the parking brake. Finally, install the wheel and lug nuts, lower the vehicle, tighten the lug nuts to the specified torque, and check the operation of the brakes carefully before driving.