Disc Rotor RUNOUT Check

WARNING: This page is about a different car, the 2016 Subaru Outback and 2016 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Check the hub unit COMPL - rear axle for free play and runout before the inspection of disc rotor runout limit. < Ref. to INSPECTION , Rear Hub Unit Bearing. >
Check the disc rotor runout.
1. Remove the caliper body assembly. < Ref. to REMOVAL , Rear Disc Brake Assembly. >
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, and check the outer disc rotor runout while rotating the disc rotor.
  Disc rotor runout limit:
  
  0.05 mm (0.0020 in)
  
  Fig 1: Checking Outer Disc Rotor Runout
  Courtesy of SUBARU OF AMERICA, INC.
4. Set a dial gauge 10 mm (0.39 in) inward from the disc rotor outer circumference, and check the inner disc rotor runout while rotating the disc rotor.
  Disc rotor runout limit:
  
  0.05 mm (0.0020 in)
  
  Fig 2: Checking Inner Disc Rotor Runout
  Courtesy of SUBARU OF AMERICA, INC.
If the disc rotor runout exceeds service limit, grind the disc rotor.
Check the disc rotor thickness after grinding. < Ref. to DISC ROTOR THICKNESS CHECK , INSPECTION, Rear Disc Rotor. >