Rear Disc Rotor: Inspection

WARNING: This page is about a different car, the 2007 Subaru Outback and 2007 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Check rear wheel bearing play and axial hub runout before disc rotor runout limit inspection. < Ref. to INSPECTION , Rear Hub Unit Bearing. >
Secure the disc rotor by tightening five wheel nuts.
Set a dial gauge 10 mm (0.39 in) inward of the rotor outer perimeter. Turn the disc rotor to check runout. If the disc rotor runout exceeds specified value, replace with a new disc rotor.

Fig 1: Measuring Disc Rotor Runout
Courtesy of SUBARU OF AMERICA, INC.

Disc rotor runout limit:

0.05 mm (0.0020 in)
Set a micrometer 10 mm (0.39 in) inward of the rotor outer perimeter, and then measure the disc rotor thickness. If the thickness of disc rotor exceeds the service limit, replace with a new disc rotor.

Fig 2: View Of Disc Rotor

Courtesy of SUBARU OF AMERICA, INC.

DISC ROTOR THICKNESS SPECIFICATIONS

Standard value			Limit	Disc outer dia.
Disc rotor thickness A mm (in)	Solid disc	10 (0.39)	8.5 (0.335)	274 (10.79)
Disc rotor thickness A mm (in)	Ventilated disc	18 (0.71)	16 (0.63)	290 (11.42)