Why don't mechanics turn rotors anymore?

Nowadays, many repair shops no longer routinely perform brake disc turning machining, mainly because modern brake discs generally use thinner composite material designs. Manufacturers recommend direct replacement rather than machining, and the original factory set thickness allowance has been greatly reduced. After turning, it may affect the heat dissipation performance and structural strength. The price of brake discs equipped in new models is gradually becoming more affordable, and the gap between manual turning costs and replacement parts is narrowing. Moreover, there is still a running in period after processing, and the comprehensive benefits are not as good as directly replacing them. It is worth noting that some high-performance car models still use high cost machinable brake discs, and this type of design will be clearly marked in the maintenance manual with the allowed number of turning times. Consumers should pay attention to distinguishing the causes of brake shake. If the brake pad material is slightly uneven due to transfer, it can be professionally polished. However, if it is truly deformed or has severe grooves, it is recommended to replace it. During daily maintenance, the thickness index of the brake disc can be checked regularly. Most disc surfaces will be marked with the minimum allowable thickness value, which is the key basis for determining whether replacement is needed.