A: This procedure is applicable to both front and, if applicable, rear brake discs. Begin by loosening wheel lug nuts, raising and securely supporting the vehicle on jackstands, and installing the lug nuts with washers to hold the disc in place or use disc retaining screws if present; for rear discs, release the parking brake. Remove the Brake Caliper without disconnecting the brake hose, suspend it with wire, and inspect the disc surface for scoring or damage. Check both sides of the disc for light scratches or deep grooves; deep scoring requires machining or replacement. To check disc runout, place a dial indicator about 1/2-inch from the disc's outer edge, set the indicator to zero, rotate the disc, and ensure the reading doesn't exceed allowable runout limit. If necessary, have the disc refinished at an automotive machine shop. The minimum wear thickness is stamped on the disc; check with a micrometer. For removal, remove caliper mounting bracket-to-steering knuckle bolts or, for rear calipers, bracket-to-trailing arm bolts, and the bracket; remove lug nuts or disc retaining screws and the disc from the hub, using bolts if stuck. During installation, place the disc over the threaded studs, install disc retaining screws, caliper mounting bracket, brake pads, and caliper over the disc, then tighten bolts. Install the wheel and lug nuts, lower the vehicle, tighten lug nuts, depress the brake pedal to bring the brake pads in contact with the disc, and check brake operation carefully before normal use.