Cadillac 15942195 Front Brake Rotor

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To inspect the brakes, start by loosening the wheel lug nuts and raising the front of the vehicle on jackstands. Remove the wheel and install the lugnuts to hold the disc in place. Next, remove the brake caliper, making sure to suspend it out of the way with a piece of wire. Visually inspect the disc surface for any score marks or damage, and check for disc runout using a dial indicator. If necessary, the disc should be refinished by an automotive machine shop. Additionally, ensure that the disc thickness meets the specified minimum thickness. For removal, unbolt the caliper mounting bracket and remove the lug nuts and disc from the hub. If removing a rear disc, detach the caliper mounting bracket from the rear knuckle. To install, place the disc over the threaded studs and install the caliper and brake pad assembly. Tighten the caliper bolts and install the wheel. Lower the vehicle, tighten the lug nuts, and depress the brake pedal to bring the brake pads into contact with the disc. Finally, check the operation of the brakes before driving the vehicle in traffic.

If necessary, the disc should be refinished by an automotive machine shop.

If the disc has excessive runout, it should be refinished.

Disc runout can be checked by placing a dial indicator at a point about 1/2-inch from the outer edge of the disc.

To inspect the brakes, start by loosening the wheel lug nuts and raising the vehicle on jackstands. Make sure to apply the parking brake and remove the wheels. Visually inspect the disc surface for any score marks or damage. Light scratches and shallow grooves are normal and won't affect brake operation, but deep grooves require disc removal and refinishing by a machine shop. Check both sides of the disc. To check disc runout, place a dial indicator about 1/2-inch from the outer edge of the disc and set it to zero. Turn the disc and make sure the indicator reading does not exceed the runout limit specifications. If it does, the disc should be refinished. It's recommended to have the discs refinished when replacing brake pads to ensure a smooth finish and eliminate any brake pedal pulsation. If you choose not to have them resurfaced, remove the glaze from the surface using emery cloth or sandpaper. Make sure the disc thickness is not less than the specified minimum thickness, which is cast into the disc, by checking it with a micrometer. For removal, remove the brake calipers without disconnecting the brake hoses and hang them out of the way. On newer models, remove the caliper mounting bracket. For front discs, remove the grease cap, wheel bearing retainer nut, spindle nut, outer bearing retainer washer, and outer wheel bearing before removing the disc/hub. For rear discs, simply slide the disc off the wheel studs. Installation is the reverse of removal, making sure to tighten the caliper mounting bracket and wheel lug nuts to the correct torque specifications. Lower the vehicle and ensure everything is securely in place.

After raising and supporting the vehicle, the brake caliper should be removed and the disc surface visually checked for damage.

After loosening the wheel lug nuts, the vehicle should be raised and securely supported on jackstands.

After installing the new disc, the wheel and lug nuts should be installed, the vehicle should be lowered, and the brake pedal should be depressed a few times to bring the brake pads into contact with the disc.