Disc Rotor RUNOUT Check

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

Check the rear hub unit bearing for free play and runout before the inspection of brake disc rear runout limit. Ref. to PROPELLER SHAFT/DRIVE SHAFT/AXLE>REAR HUB UNIT BEARING>INSPECTION .

Check the brake disc rear runout.

Remove the caliper body. Ref. to BRAKE>REAR DISC BRAKE ASSEMBLY>REMOVAL .
Secure the brake disc rear by tightening the five wheel nuts.

Set a dial gauge 10 mm (0.39 in) inward from the brake disc rear outer circumference, and check the runout of front side while rotating the brake disc rear.

Service limit:

0.05 mm (0.002 in)

NOTE:

The location where the magnet stand is installed varies to stabilize the magnet stand.

Courtesy of SUBARU OF AMERICA, INC.

Set a dial gauge 10 mm (0.39 in) inward from the brake disc rear outer circumference, and check the runout of back side while rotating the brake disc rear.
Service limit:

0.05 mm (0.002 in)

NOTE:

The location where the magnet stand is installed varies to stabilize the magnet stand.

Courtesy of SUBARU OF AMERICA, INC.

If the brake disc rear runout exceeds service limit, grind the brake disc rear.
Check the brake disc rear thickness after grinding. Ref. to BRAKE>REAR DISC ROTOR>INSPECTION>DISC ROTOR THICKNESS CHECK .