Rear Disc Brake Rotor (2002 Legacy & Outback): Inspection

1. Set dial gauge on disc rotor. See Fig 1 . Turn disc rotor to check runout. See REAR DISC BRAKE SERVICE SPECIFICATIONS  table under DISC BRAKE SPECIFICATIONS.
   NOTE: Securely adjust the disc rotor to hub. Make sure dial gauge is set to 0.2" (5 mm) inward of rotor outer perimeter.
2. If runout of disc exceeds the limit, check for abnormal free play at the hub bearing and runout in the thrust direction. See INSPECTION under REAR AXLE under REMOVAL & INSTALLATION in appropriate REAR AXLE SHAFTS article under DRIVELINE/AXLES.
3. Measure disc rotor thickness. See Figure . See REAR DISC BRAKE SERVICE SPECIFICATIONS  table under DISC BRAKE SPECIFICATIONS.
   NOTE: Make sure dial gauge is set to 0.2" (5 mm) inward of rotor outer perimeter.

Fig 1: Measuring Rear Disc Rotor Runout

Courtesy of SUBARU OF AMERICA, INC.