GM 23118530 Front Brake Rotor

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Loosen the wheel lug nuts, raise the vehicle, and support it securely on jackstands. Remove the brake caliper and mounting bracket without disconnecting the brake hose, then suspend the caliper out of the way with a piece of wire. Visually 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 excessive disc runout. To check brake disc runout, reinstall the lug nuts (inverted if possible) 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 or replaced. A seemingly smooth brake disc that has been previously installed should be resurfaced regardless of the dial indicator reading to ensure a perfectly flat surface, eliminating any brake pedal pulsation. If not resurfacing, remove the glaze from the surface with emery cloth or sandpaper using a swirling motion. Do not use a brake disc that is severely pitted, scarred, heavily grooved, or has been machined below the minimum thickness, which is cast or stamped into the disc. The brake disc thickness can be checked with a micrometer, ideally measuring in at least three different locations equally spaced around the disc. Remove the caliper and the caliper mounting bracket, then remove the lug nuts if they were reinstalled for the runout inspection. Mark the brake disc at one of the wheel studs for reinstallation in the same position, then remove the disc retaining screw if equipped and take the disc off the hub. While the disc is off, wire-brush the backside of the disc and the center portion of the wheel hub where the disc makes contact. Align the index marks and place the disc in position over the wheel studs, tightening the retaining screw securely if equipped. Install the caliper mounting bracket and caliper, tightening the bolts to the specified torque. Install 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 from the caliper. Check the operation of the brakes carefully before driving the vehicle.