Disc Rotor RUNOUT Check

Check the hub unit COMPL - rear axle for free play and runout before the inspection of disc rotor runout limit. Ref. to DRIVE SHAFT SYSTEM>Rear Hub Unit Bearing>INSPECTION .
Check the disc rotor runout.
1. Remove the caliper body assembly. Ref. to BRAKE>Rear Disc Brake Assembly>REMOVAL .
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 (0.002 in)
  
  NOTE: <Example of magnet stand and dial gauge installation>
  
  The location where the magnet stand is installed varies to stabilize the magnet stand.
  
  Fig 1: Setting Dial Gauge Inward From Disc Rotor Outer Circumference
  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 (0.002 in)
  
  NOTE: <Example of magnet stand and dial gauge installation>
  
  The location where the magnet stand is installed varies to stabilize the magnet stand.
  
  Fig 2: Setting Dial Gauge Inward From Disc Rotor Outer Circumference
  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 BRAKE>Rear Disc Rotor>INSPECTION>DISC ROTOR THICKNESS CHECK .