How much runout is allowable on an air disk rotor?

The allowable runout on an air disk rotor is critical for ensuring proper brake function and performance. A maximum runout of 0.020 of an inch is recognized as acceptable because it helps maintain the alignment and effectiveness of the brake components. Excessive runout can lead to uneven wear, increased vibration, and diminished braking performance, posing safety risks while driving. Keeping the runout within this limit allows for smoother operation of the brakes, ensures better contact with the brake pads, and minimizes the likelihood of brake noise or pulsation during operation. Thus, manufacturers and industry standards typically set the threshold at this measurement to ensure safety and reliability in braking systems.