Subaru IMPREZA 2002 Service Manual page 396

REAR DISC ROTOR
BRAKE
C: INSPECTION
1) Set a dial gauge on the disc rotor. Turn the disc
rotor to check runout.
CAUTION:
Securely adjust the disc rotor to
hub.
NOTE:
Make sure the dial gauge is set 5 mm (0.20 in) in-
ward of rotor outer perimeter.
If the runout of disc rotor exceeds the limit, check
for abnormal free play at hub bearing and runout in
the thrust direction. <Ref. to DS-31, INSPECTION,
Rear Axle.>
If the hub bearing is okay, replace the disc rotor.
Disc rotor runout limit:
0.07 mm (0.0028 in)
2) Measure the disc rotor thickness.
If the thickness of disk rotor is below runout limit, re-
place the disk rotor.
NOTE:
Make sure the micrometer is set 5 mm (0.20 in) in-
ward of rotor outer perimeter.
Standard value
Service limit
10 mm (0.39 in)
8.5 mm (0.335 in)
BR-26