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Disc Rotor RUNOUT Check

WARNING: This page is about a different car, the 2015 Subaru Outback and 2015 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check the hub unit COMPL - front axle for free play and runout before the inspection of disc rotor runout limit. <Ref. to INSPECTION , Front Hub Unit Bearing.>
  2. Tighten the wheel nuts to secure disc rotor.
  3. 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
    G10276676Courtesy of SUBARU OF AMERICA, INC.
  4. If the disc rotor runout exceeds service limit, grind the disc rotor.
  5. Check the disc rotor thickness after grinding. <Ref. to DISC ROTOR THICKNESS CHECK , INSPECTION, Front Disc Rotor.>
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