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Brake Rotor: Installation

CAUTION: Whenever the brake rotor has been separated from the hub/axle flange, any rust or contaminants should be cleaned from the hub/axle flange and the brake rotor mating surfaces. Failure to do this may result in excessive assembled lateral runout (LRO) of the brake rotor, which could lead to brake pulsation.
  1. Use Rotor Resurfacing Kit (J-42450-A) to clean all rust and contaminants from the mating surface of the hub flange. Use the Wheel Hub Resurfacing Kit (J-41013) to clean all rust and contaminants from the inside diameter of the hat section of the brake rotor to prevent any foreign material from getting between the brake rotor and the hub flange. Inspect the mating surfaces of the hub/axle flange and the rotor to ensure that there are no foreign particles or debris remaining.
    2. CAUTION: If the rotor was removed using the jack screw method you must ensure that the hub flange is free of nicks or marks caused by this procedure. Remove all raised nicks or marks before installing the rotor.
  2. Align the rotor to its original position on the hub, if applicable, and install the rotor. If the brake rotor was removed and installed as part of a brake system repair, measure the assembled Lateral Runout (LRO) of the brake rotor to ensure optimum performance of the disc brakes. See appropriate ANTI-LOCK article.
  3. If the brake rotor assembled LRO measurement exceeds the specification, bring the LRO to within specifications. See appropriate ANTI-LOCK article. Install the caliper and caliper mounting bracket assembly.
  4. Perform the following procedure before installing the brake caliper bracket mounting bolts. Remove all traces of the original adhesive patch. Clean the threads of the bolt with brake parts cleaner or the equivalent and allow to dry. Apply Threadlocker (GM P/N 12345493) to the threads of the bolt.
  5. Install the 2 caliper bracket mounting bolts. Tighten the brake caliper bracket mounting bolts to specification. See TORQUE SPECIFICATIONS . Install the tire and wheel assembly. Lower the vehicle.
  6. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance. Slowly release the brake pedal. Wait 15 seconds, then repeat step until a firm pedal is obtained. This will properly seat the brake caliper pistons and brake pads. Fill the master cylinder reservoir to the proper level with clean brake fluid.


CAUTION: Whenever the brake rotor has been separated from the hub/axle flange, any rust or contaminants should be cleaned from the hub/axle flange and the brake rotor mating surfaces. Failure to do this may result in excessive assembled lateral runout (LRO) of the brake rotor, which could lead to brake pulsation.
  1. Use the Wheel Hub Resurfacing Kit (J-42450-A) to clean all rust and contaminants from the mating surface of the hub flange. Use the Rotor Resurfacing Kit (J-41013) to clean all rust and contaminants from the inside diameter of the hat section of the brake rotor to prevent any foreign material from getting between the brake rotor and the hub flange.
  2. Inspect the mating surfaces of the hub/axle flange and the rotor to ensure that there are no foreign particles or debris remaining. Align the rotor to its original position on the hub, if applicable, and install the rotor by slowly turning the rotor while pushing the rotor towards the axle.
  3. If the brake rotor was removed and installed as part of a brake system repair, measure the Assembled Lateral Runout (LRO) of the brake rotor to ensure optimum performance of the disc brakes. If the brake rotor assembled LRO measurement exceeds the specification, bring the LRO to within specifications.
  4. Install the caliper and the bracket as an assembly to the vehicle. Perform the following procedure before installing the caliper bracket mounting bolts.
    • Remove all traces of the original adhesive patch.
    • Clean the threads of the bolt with brake parts cleaner or the equivalent and allow to dry.
    • Apply Threadlocker (GM P/N 12345493) to the threads of the bolt.
  5. Install the caliper bracket mounting bolts. Tighten the brake caliper bracket mounting bolts to specification. See TORQUE SPECIFICATIONS . Install the tire and wheel assembly. Lower the vehicle.
  6. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance. Slowly release the brake pedal. Wait 15 seconds, then repeat step until a firm pedal is obtained. This will properly seat the brake caliper pistons and brake pads.
  7. Fill the master cylinder reservoir to the proper level with clean brake fluid.
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