GM 21019788 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 wheel and install the lug nuts to hold the disc in place. Then, remove the brake caliper, suspending it out of the way with wire. If working on a front disc, remove the caliper mounting bracket as well. Visually inspect the disc surface for score marks and damage, and check for disc runout using a dial indicator. If necessary, refinish the disc. Make sure not to machine the disc below the specified minimum thickness. To remove the disc, remove the lug nuts or disc retaining screws and free the disc from the hub. If stuck, use bolts to loosen it. When installing the new disc, secure it with retaining screws. Install the caliper mounting bracket and caliper, tightening the bolts properly. Finally, install the wheel, lower the vehicle, and tighten the lug nuts. Test the brakes before driving.