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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 limit. 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 disc rotor runout exceeds the limit, resurface 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
    G05327343Courtesy of SUBARU OF AMERICA, INC.
    DISC ROTOR SPECIFICATIONS

    Standard Limit Disc outer dia.
    Disc rotor thickness A mm (in) Solid disc 10 (0.39) 8.5 (0.335) 274 (10.79)
    Ventilated disc 18 (0.71) 16 (0.63) 290 (11.42)
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