Buick 19303830 Rotor

Loosen the wheel lug nuts, raise the vehicle, and support it securely on jackstands. Apply the parking brake and block the wheels to prevent rolling. Remove the wheel and install three lug nuts to hold the disc in place. 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 hose. Visually inspect the disc surface for score marks and damage; light scratches are normal, but deep score marks over 0.015-inch require disc removal and refinishing. Check both sides of the disc, noting that severe wear may necessitate replacement. To check disc run out, mount 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 limit. Discs should be resurfaced for a smooth finish, and if not machined, remove the glaze with sandpaper or emery cloth. Never machine the disc below the specified minimum allowable thickness, which can be checked with a micrometer. If equipped, remove the caliper mounting bracket by detaching the bolts. Place the disc over the threaded studs, install the caliper and brake pad assembly, and tighten the caliper bolts to the specified torque. 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 operation of the brakes before driving.