Front Disc Rotor: Inspection
WARNING: This page is about a different car, the 2013 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
- Check the front wheel bearing play and axle hub runout before the inspection of disc rotor runout limit. < Ref. to INSPECTION , Front Axle. >
- Secure the disc rotor by tightening the five wheel nuts.
- Set a dial gauge 10 mm (0.39 in) inward from the disc rotor outer circumference. Rotate the disc rotor to check runout. If the disc rotor runout exceeds the limit, resurface the disc rotor. After grinding, check the thickness of the disc rotor according to the procedure in step 4).
Courtesy of SUBARU OF AMERICA, INC.
Disc rotor runout limit:
Brembo type
0.075 mm (0.0030 in)
Except for brembo type
0.050 mm (0.0020 in)
- Set a micrometer 10 mm (0.39 in) inward from the disc rotor outer perimeter, and then measure the disc rotor thickness. If the thickness A of the disc rotor exceeds the service limit, replace with a new disc rotor.
Disc rotor thickness A
mm (in)Standard Limit Disc rotor diameter Brembo type 30 (1.18) 28 (1.10) 326 (12.83) Except for brembo type 24 (0.94) 22 (0.87) 294 (11.57)