Tip Clearance
WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Measure the tip clearance of rotors. If the clearance is out of standard, replace the rotors as a set.
Tip clearance between inner and outer rotors:
Standard
0.04 - 0.14 mm (0.0016 - 0.0055 in)