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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 213 (Disc Brake System) >> Repair Instructions >> Front Brake Rotor Replacement (2500 Series) >> Installation Procedure

Installation Procedure

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    NOTE: Any new rotor must have the protective coating removed from the friction surfaces before being placed in service. Remove the protective coating using denatured alcohol or an equivalent brake cleaner, and wipe the surface clean with clean cloths. Do not use gasoline, kerosene, or other oil base solvents which may leave an oily residue. This residue is damaging to the brake lining and is flammable.
    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. Inspect the mating surfaces of the hub/axle flange and the rotor to ensure that there are no foreign particles or debris remaining.
    3. IMPORTANT: 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.
    Fig 1: View Of Front Brake Rotor And Hub
    GM370132Courtesy of GENERAL MOTORS CORP.
  3. Align the rotor to its original position on the hub, if applicable, and install the rotor.
  4. 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. Refer to Brake Rotor Assembled Lateral Runout Measurement .
  5. If the brake rotor assembled LRO measurement exceeds the specification, bring the LRO to within specifications. Refer to Brake Rotor Assembled Lateral Runout Correction .
    6. Fig 2: View Of Brake Caliper & Brake Caliper Bracket
    GM924321Courtesy of GENERAL MOTORS CORP.
  6. Install the brake caliper and bracket assembly.
  7. Perform the following procedure before installing the caliper bracket mounting bolts.
    1. Remove all traces of the original adhesive patch.
    2. Clean the threads of the bolts with brake parts cleaner or equivalent and allow to dry.
    3. Apply Threadlocker GM P/N 12345493 (Canadian P/N 10953488) to the threads of the bolts.
    8. NOTE: Refer to Fastener Notice .
  8. Install the brake caliper bracket mounting bolts.

    Tighten:  Tighten the bolts to 300 N.m (221 lb ft).

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