GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2009 🢒 G8 🢒 Preface 🢒 Dangers, Warnings, and Cautions 🢒 Front Wheel Hub Assembly Inspection

    Warning: Refer to Safety Glasses Warning in the Preface section.

    Danger: To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Remove the front wheel. Refer to Tire and Wheel Removal and Installation.
  3. Remove the brake disc. Refer to Front Brake Rotor Replacement.
  4. Clean the wheel mounting surface of the front wheel hub assembly of any loose debris, rust, and/or corrosion.

    5. Object Number: 1959856 Size: SH

    Important: The dial gauge mounting base (1) must be securely mounted to the front strut unit (2).

  5. Position a dial indicator (4), on the wheel mounting surface of the front wheel hub assembly (3) perpendicular to the surface.
  6. Slowly rotate the front wheel hub assembly one complete revolution in order to find the low spot.
  7. Set the dial indicator to zero at the low spot.
  8. Slowly rotate the front wheel hub assembly one more complete revolution and measure the total amount of radial runout.

    9. Specification
    Maximum front wheel hub assembly runout 0.025 mm (0.001 in)


    Object Number: 1959857 Size: SH

    Important: The dial gauge mounting base (1) must be securely mounted to the front strut unit (2).

  9. Position the dial indicator (4) on the centre of the wheel mounting flange (3) of the front wheel hub assembly perpendicular to the surface.
  10. Push the wheel mounting flange towards the centre of the car, set the dial indicator to zero.
  11. Pull the wheel mounting flange towards the outside of the car and measure the total amount of axial end float.

    12. Specification
    The front wheel hub assembly has zero axial end float (preload).

  12. If the measurements are not within the specified range replace the front wheel hub assembly. Refer to Front Wheel Bearing and Hub Replacement.
  13. Install the brake disc. Refer to Front Brake Rotor Replacement.
  14. Install the rear wheel. Refer to Tire and Wheel Removal and Installation.
  15. Remove the safety stands.
  16. Lower the vehicle to the ground.