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Brake Disc Runout Check: Check

WARNING: This page is about a different car, the 2004 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
  1. Loosen the wheel nuts.
  2. Raise and support the vehicle. For additional information, refer to JACKING AND LIFTING .
  3. Remove the wheel.
  4. Remove the brake pads. For additional information, refer to FRONT BRAKE CALIPER & PADS and/or REAR BRAKE CALIPER & PADS .
  5. Reverse and install the wheel nuts to hold the brake disc in place.
  6. Install a dial indicator gauge and holding fixture to the suspension strut.
    7. NOTE: If the runout is outside the specification, check the wheel hub face runout.
    Fig 1: Measuring Inner And Outer Faces Of Disc
    G03191341Courtesy of FORD MOTOR CO.
  7. Using a suitable dial indicator gauge measure the inner and outer faces of the disc.
    1. Position the gauge so that it contacts the disc 10 mm (0.4 inch) from the outer edge.
    2. Slowly rotate the disc. The total dial reading should not exceed the given specification. For additional information, refer to DISC BRAKE SPECIFICATIONS .
  8. Check the brake disc thickness variation.
    • Using a suitable micrometer measure the disc thickness at eight positions 45 degrees apart and 15 mm in from the outer edge of the brake disc.
    • If any of the readings vary by 0.015 mm or more, or the brake disc thickness is less than the specified minimum, a new brake disc should be installed.
    Fig 2: Measuring Disc Thickness Variation
    G03191342Courtesy of FORD MOTOR CO.
  9. Remove the brake disc. For additional information, refer to FRONT BRAKE ROTOR and/or REAR BRAKE ROTOR .
    10. NOTE: Make sure the wheel hub face is clean and free of rust and foreign material.
    Fig 3: Removing Wheel Hub Face Runout
    G03191343Courtesy of FORD MOTOR CO.
  10. Using the special tool, check the wheel hub face runout.
    • Slowly rotate the wheel hub and check the runout. If the runout exceeds the given specification. Install a new wheel hub and recheck. For additional information, refer to FRONT SUSPENSION and/or REAR SUSPENSION .
  11. If the hub face runout is within specification install a new brake disc and recheck the brake disc runout. For additional information, refer to FRONT BRAKE ROTOR and/or REAR BRAKE ROTOR .
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