What is the consequence of excessive runout on rotors?

Excessive runout on rotors can lead to increased wear on brake pads. When a rotor has excessive runout, it means that it is not perfectly aligned or circular, leading to uneven contact with the brake pads as they engage. As a result, some areas of the brake pad may wear down more quickly than others, causing premature degradation and reduced lifespan of the pads. This uneven wear can also lead to inconsistent braking performance, as the brakes may grab or slip depending on the contact surface.

Furthermore, it is essential to understand that while increased wear on brake pads is the most direct consequence of excessive runout, it can also contribute to other issues such as vibration and noise during braking. However, the primary and most pertinent consequence remains the accelerated wear on the brake pads themselves.