Can Brake Rotors Be Turned if They Are Already Thin?
If your brake rotors are already thin, it is possible to have them turned, but it is not always recommended. Turning brake rotors involves removing a thin layer of material to ensure a smooth surface for the brake pads to contact. However, if the rotors are already at a dangerously thin level, turning them may compromise their structural integrity and reliability.
Professional Mechanics and Brake Rotors
As a seasoned mechanic with over 40 years of experience, I have never turned rotors or drums myself. Most mechanics and professional repair shops follow the guidelines set by manufacturers and tend to replace rather than turn brake rotors that are approaching or below the minimum required thickness.
Manufacturers specify minimum machining limits. For instance, on my car, the front rotors must not be thinner than 25mm, and the rear rotors must not fall below 14mm. If the rotors are beneath these minimum thickness requirements, they should be replaced rather than turned.
Structural Integrity and Safety
Thin brake rotors can become prone to warping, cracking, or even complete failure due to the high heat and pressure generated during braking. This can significantly reduce braking performance and lead to dangerous situations, potentially even causing brake failure.
Therefore, it is crucial to have your mechanic or brake specialist assess the condition of your rotors. In most cases, if the rotors are too thin, the safest option is to replace them with new ones to ensure reliable and safe braking performance.
alers and Legal Considerations
Attempting to install severely thin rotors (below the minimum thickness) is not only unsafe but also unlawful in most jurisdictions. Most reputable repair shops will neither machine nor install rotors that are dangerously thin as it poses a significant risk for both the vehicle owners and the mechanics performing the work.
For European cars, especially, the practice of replacing rotors along with every set of brake pads is common. For American and Asian vehicles, the cost of replacement is generally not prohibitive. In any case, no reputable auto shop will turn rotors if they fall below the minimum thickness specified by the manufacturer.
Should your rotors be warped or scored, the safest and most effective course of action is to replace them, regardless of the thickness specifications. Warped or scored rotors can significantly impact the braking performance, leading to uneven and poor stopping power.
Always consult a professional mechanic or brake specialist before deciding on any repair or maintenance work, ensuring the safety and reliability of your vehicle's braking system.