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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. Ref. 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 resurfacing, check disc rotor thickness as in step 4.
    Fig 1: Checking Rear 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 disc rotor exceeds the service limit, replace with a new disc rotor.
    Fig 2: Identifying Disc Rotor Thickness
    G05032756Courtesy of SUBARU OF AMERICA, INC.
    DISC ROTOR THICKNESS SPECIFICATION

    Specification Service limit Disc rotor outer diameter
    Disc rotor thickness A mm (in) 18 (0.71) 16 (0.63) 320 (12.59)
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