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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: Measuring Disc Rotor Thickness
    G10276699Courtesy of SUBARU OF AMERICA, INC.
    Disc rotor type Standard Wear limit Disc rotor outer diameter
    Disc rotor thickness (A) Solid disc 10 mm (0.39 in) 8.5 mm (0.33 in) 274 mm (10.79 in)
    Ventilated disc 18 mm (0.71 in) 16 mm (0.63 in) 278 mm (10.94 in)
  2. If the wear limit is exceeded in the inspection, replace the disc rotor.
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