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 against the hub flange. If the lug nuts don't contact the disc when screwed on all the way, install washer sunder them. If you're checking the rear disc release the parking brake. Remove the 
Brake Caliper, suspend the caliper out of the way with a piece of wire. Visually inspect the disc surface for score marks and other damage. To check disc run out, place a dial indicator at a point about 1/2-inch from the outer edge of the disc. Set the indicator to zero and turn the disc. The indicator reading should not exceed the specified allowable run out limit. If it does, the disc should be refinished by an automotive machine shop. The discs should be resurfaced regardless of the dial indicator reading, as this will impart a smooth finish and ensure a perfectly flat surface, eliminating any brake pedal pulsation or other undesirable symptoms related to questionable discs. Remove the caliper support bracket bolts and remove the support bracket. Slide the disc off the hub. If the disc is stuck to the hub and won't come off, thread two bolts into the holes provided and tighten them. Thoroughly clean all parts. Install the disc, caliper support bracket and brake pads. Install the wheel and lug nuts, then lower the vehicle to the ground. Tighten the lug nuts. Depress the brake pedal a few times to bring the brake pads into contact with the disc. Check the operation of the brakes carefully before driving the vehicle.