Disc Rotor RUNOUT Check

Check the front hub unit bearing for free play and runout before the inspection of disc rotor runout limit. Refer to INSPECTION .
Tighten the wheel nuts to secure disc rotor.
Set a dial gauge 10 mm (0.39 in) inward from the disc rotor outer circumference, and check the disc rotor runout while rotating the disc rotor.
Disc rotor runout limit: 0.05 mm (0.0020 in)

Fig 1: Checking Disc Rotor Runout Using Dial Gauge
Courtesy of SUBARU OF AMERICA, INC.
If the runout limit is exceeded in the inspection, replace the disc rotor.