GM 19171429 Front Brake Rotor

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Whenever the disc brake pads are checked for wear, it is also necessary to look at the state or condition of the discs or rotors. Thus, ligth scoring or grooving are expected but deep grooves or severity erosion are not permitted. Some models have a specific channel, the so-called squeal groove, which should not be confused with damage. The existence of a vibration when the brake is applied has also been attributed to disc run out. To check for this, a dial gauge or feeler blades may be used between the disc and any fixed point. It was established that the disc should be turned at a slow rate in order not to exceed the runout of 0.004 inches. Thickness variations that are above the 0.0005 inches may also imply that the disc will vibrate during braking. Discs usually have wear limit and refinish thickness dimensions moulded on them. On the other hand, if a dealer fails to refinish a disc to certain standards of the set tolerance, a new disc has to be fitted. When a brake drum is pulled on a particular scheme for a lining inspection, it is necessary to look for cracks, 'scoring,' and out-of-round conditions. An out-of-round drum results in pulsations felt through the brake pedal during the application and the internal diameter has to be checked at various positions using an internal micrometer. Drums may be refinished internally; however, the wear and refinish sizes that may be cast into them must not be exceeded.

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.