Impreza WRX STI F4-2.5L DOHC Turbo (2007)
3. Set a dial gauge 10 mm (0.39 inch) inward of rotor outer perimeter. Turn the disc rotor to check runout. If the disc rotor runout exceeds the
service limit, resurface the disc rotor. After resurfacing, check disc rotor thickness as in step 4.
Disc rotor runout limit. 0.070 mm (0.0028 inch)
4. Set a micrometer 10 mm (0.39 inch) 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.