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Rear Disc Brake Rotor: Inspection

  1. Set dial gauge on disc rotor. Turn disc rotor to check runout. See Fig 1 .
    NOTE: Securely adjust the disc rotor to hub. Make sure dial gauge is set to 0.39" (10 mm) inward of rotor outer perimeter.
  2. If runout of disc exceeds the limit, check for abnormal free play at the hub bearing and runout in the thrust direction. See DISC BRAKE SPECIFICATIONS  . See INSPECTION under REAR AXLE under REMOVAL & INSTALLATION in appropriate REAR AXLE SHAFTS article under DRIVELINE/AXLES.
  3. If hub bearing is okay, replace the disc rotor.
  4. Measure disc rotor thickness. See Figure . If thickness of disc rotor is below runout limit, replace the disc rotor. See DISC BRAKE SPECIFICATIONS  .
    NOTE: Make sure dial gauge is set to 0.39" (10 mm) inward of rotor outer perimeter.
Fig 1: Measuring Rear Disc Rotor Runout
G00305262Courtesy of SUBARU OF AMERICA, INC.
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