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Disc Rotor Thickness Check

  1. Set a micrometer 10 mm (0.39 in) inward from the disc rotor outer perimeter, and then measure the disc rotor thickness (A).
    Fig 1: Identifying Disc Rotor Thickness
    G07915615Courtesy of SUBARU OF AMERICA, INC.
    Size Standard Wear limit Disc rotor outer diameter
    Disc rotor thickness (A) 16-inch 24 mm (0.94 in) 22 mm (0.87 in) 294 mm (11.57 in)
    17-inch 30 mm (1.18 in) 28 mm (1.10 in) 316 mm (12.44 in)
  2. If the wear limit is exceeded in the inspection, replace the disc rotor.
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