Rear Disc Rotor: Inspection

Secure disc rotor by tightening the five wheel nuts.
Set a dial gauge on the disc rotor. Turn disc rotor to check runout.
CAUTION: Securely fix disc rotor to hub.

Fig 1: Setting Dial Gauge On Disc Rotor
Courtesy of SUBARU OF AMERICA, INC.
NOTE:
- Make sure that dial gauge is set 10 mm (0.39 in) inward of rotor outer perimeter.
- If disc rotor runout is above standard value, inspect play of hub bearing axial direction and runout of axle hub.
  < Ref. to INSPECTION , Hub Unit Bearing . >
Disc rotor runout limit:

0.075 mm (0.0030 in)
Measure disc rotor thickness.

Fig 2: Identifying Disc Rotor Thickness
Courtesy of SUBARU OF AMERICA, INC.

NOTE: Make sure that micrometer is set 5 mm (0.20 in) inward of rotor outer perimeter.

Disc rotor thickness: A

Standard value

10 mm (0.39 in)

Service limit

8.5 mm (0.335 in)