GM 91175503 Front Brake Rotor

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To inspect the brakes, start by loosening the wheel lug nuts and raising the vehicle on jackstands. Remove the front wheels and then remove the brake caliper, making sure not to stretch or twist the brake hose. Visually check the disc surface for score marks and deep grooves, which may require disc removal and refinishing. Check both sides of the disc and inspect the wheel bearings for any issues. To check disc runout, use a dial indicator and turn the disc, ensuring the reading does not exceed the specified limit. If necessary, have the disc refinished by a machine shop. The disc thickness should not be machined below the minimum refinish thickness. To remove the disc, loosen the bolts while an assistant depresses the brake pedal, remove the cotter pin and hub nut, and then remove the caliper and pads. Reference mark the position of the disc to the caliper mounting bracket. Use a slide hammer with the proper adapter to pull off the disc and wheel hub, and separate the disc from the hub. When installing, make sure the spacer on the hub is positioned correctly and use the reference marks made during removal to install the disc and hub assembly. Tighten the driveaxle hub nut to the specified torque and install a new cotter pin. If applicable, re-stake the hub nut into the groove. Install the caliper and brake pad assembly over the disc, position it on the steering knuckle, and tighten the caliper bolts. Finally, install the wheel, lower the vehicle, and tighten the lug nuts. Depress the brake pedal a few times to bring the brake pads into contact with the disc and check the brake operation before normal use.