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Installation Procedure

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    IMPORTANT: 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 J 42450-A  to clean all rust and contaminants from the mating surface of the hub flange. See Special Tools .
  2. Use the 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. See Special Tools .
  3. Inspect the mating surfaces of the hub/axle flange and the rotor to ensure that there are no foreign particles or debris remaining.
  4. Align the rotor to its original position on the hub, if applicable.
    5. Fig 1: View Of Rear Brake Rotor
    GM686151Courtesy of GENERAL MOTORS CORP.
  5. Install the rotor by slowly turning the rotor while pushing the rotor towards the axle.
  6. If the rotor was removed and installed as part of a brake system repair, measure the assembled lateral runout (LRO) of the rotor to ensure optimum performance of the disc brakes. Refer to Brake Rotor Assembled Lateral Runout Measurement .
  7. If the rotor assembled LRO measurement exceeds the specification, bring the LRO to within specifications. Refer to Brake Rotor Assembled Lateral Runout Correction .
    8. Fig 2: Rear Brake Caliper Mounting Bracket Bolts (15 Series w/NYS)
    GM789156Courtesy of GENERAL MOTORS CORP.
  8. Install the caliper and caliper bracket as an assembly.
  9. Perform the following procedure before installing the brake caliper bracket bolts:
    1. Remove all traces of the original adhesive patch.
    2. Clean the threads of the bolts with brake parts cleaner or the equivalent and allow to dry.
    3. Apply threadlocker GM P/N 12345493 (Canadian P/N 10953488) to the threads of the bolts.
    10. NOTE: Refer to Fastener Notice .
  10. Install the brake caliper bracket bolts.

    Tighten:  Tighten the bolts to 200 N.m (148 lb ft).

  11. Install the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation .
  12. Lower the vehicle.
  13. With the engine OFF gradually apply the brake pedal to approximately 2/3 of its travel distance.
  14. Slowly release the brake pedal.
  15. Wait 15 seconds then repeat steps 13-14 until a firm pedal is obtained. This will properly seat the caliper pistons and pads.
  16. Fill the master cylinder reservoir to the proper level with clean brake fluid, if necessary. Refer to Master Cylinder Reservoir Filling (JD9, JH6) or Master Cylinder Reservoir Filling (Two-mode Hybrid) .
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