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Brake Disc RUNOUT Check: Check

WARNING: This page is about a different car, the 2002 Mercury Cougar. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the wheel and tire. For additional information, refer to SPECIFICATIONS & PROCEDURES .
  2. Detach the caliper and anchor plate assembly. For additional information, refer to DISC & DRUM .
  3. Reverse and install the wheel nuts to hold the brake disc in place.
  4. Install a dial indicator gauge and holding fixture to the suspension unit.
    5. NOTE: If the runout is outside specification, check the hub face runout.
  5. Using the special tool, 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 hub/disc assembly. The total dial reading should not exceed 0.075 mm (0.003 inch).
      Fig 1: Measuring Inner And Outer Faces Of Disc
      G03417733Courtesy of FORD MOTOR CO.
  6. Remove the brake disc. For additional information, refer to DISC & DRUM .
  7. Using the special tool, check the hub face runout.
    • Slowly rotate the hub and check the runout. If the runout exceeds 0.05 mm (0.002 inch) install a new hub and recheck. For additional information, refer to DISC & DRUM .
    Fig 2: Checking Hub Face Runout
    G03417734Courtesy of FORD MOTOR CO.
  8. If the hub face runout is within specification install a new disc and recheck disc run-out. For additional information, refer to DISC & DRUM .
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