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Rear Disc Rotor: Inspection

  1. Check the rear wheel bearing play and axle hub runout before inspecting the disc rotor runout. Refer to INSPECTION , Rear Hub Unit Bearing .
  2. Secure the disc rotor by tightening the five wheel nuts.
  3. Set a dial gauge 10 mm (0.39 in) inward from the disc rotor outer circumference. Rotate the disc rotor to check runout. If the runout of disc rotor exceeds the service limit, grind the disc rotor. After grinding, check the thickness of the disc rotor according to the procedure in step 4).
    Fig 1: Checking Disc Rotor Runout
    G05032781Courtesy of SUBARU OF AMERICA, INC.

    Disc rotor runout limit: 

    0.05 mm (0.0020 in) 

  4. Set a micrometer 10 mm (0.39 in) inward from the disc rotor outer perimeter, and then measure the disc rotor thickness. If the thickness of the disc rotor exceeds the service limit, replace with a new disc rotor.
Fig 2: Identifying Disc Rotor Thickness
G05327343Courtesy of SUBARU OF AMERICA, INC.
DISC ROTOR THICKNESS REFERENCE CHART

Standard Limit Disc outer dia.
Disc rotor thickness A mm (in) 10 (0.39) 8.5 (0.335) 286 (11.26)
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