Rotor Distortion and the Hub Flange
![Lateral runout and thickness variation measured](graphics/brake-rotor-lateral-runout.png)
The steering wheel shakes when I apply the brakes. This vibration is the most common customer complaint when it comes to brakes. Sometimes, this vibration is severe.
![Wheel hub.](graphics/wheel-hub-1.jpg)
Lateral runout and thickness variation are real problems and result in rotor replacement and machining. This vehicle requires frequent rotor replacement, indicating that something else is causing this recurring pulsation.
![Rotor distortion and hub flange surface inspection.](graphics/brakes-rusty-hub.png)
It reminds us of the importance of inspecting components like the steering knuckle, hub, and hub flange before replacing the rotors. Rust, debris, or a protrusion on its surface results in an uneven surface between the flange and the rotor. This problem causes the rotor to wobble.
![Steering wheel vibration caused by brake rotor wobble.](graphics/steering-wheel-2.jpg)
If the problem rotor is on the front, a vibration will be felt in the steering wheel while braking. The vibration is felt in the seat if the problem rotor is on the rear.