Rev Up for the 2026 ASE Brakes Certification – Master the Test and Shift Gears to Success!

Turning or machining brake rotors is a maintenance procedure performed to restore the surface of the rotor for optimal functionality and performance. This process is particularly relevant when rotors are uneven or have wear patterns that can lead to brake pulsation, reduced contact surface, or noise.

When rotors are in good condition but have worn down beyond minimum thickness specifications, they may not provide sufficient material to safely dissipate heat or maintain effective clamping force during braking. If machining is done, it allows for a fresh, smoother surface which can enhance braking performance and improve overall safety. Addressing issues of imbalance, as seen with uneven surfaces, is critical to maintain the integrity of the braking system.

While rust can be a factor in some cases, mere rust does not automatically designate the need for turning. New brake pads should typically be installed on rotors that are either new or have been machined, but this action alone does not justify turning unless there are other factors at play, such as uneven surfaces or wear beyond specifications. Lastly, experiencing noise during braking can be a sign of various issues, including rotor condition, but it does not directly indicate that machining is always necessary without considering the complete diagnostics of the rotor's condition.