Front Disc Rotor: Inspection

Check front wheel bearing play and axial hub runout before disc rotor runout limit inspection. <Ref. to INSPECTION , Front Axle.>
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 Front Wheel Disc Runout (17 Inch)
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 (17 Inch)

Courtesy of SUBARU OF AMERICA, INC.

DISC ROTOR THICKNESS SPECIFICATIONS (17 INCH)