When deciding whether the brake disc needs to be polished or replaced, the owner needs to make a judgment based on the specific wear and tear of the brake disc.Generally, there will be three pits on the brake disc. The depth of each pit is 1.5mm. If the wear depth reaches 3 mm, it means that the wear of the brake disc is already very serious. At this time, a new brake disc needs to be replaced immediately.

If the brake disc is only rusty on the surface, the rust can be worn off by the friction between the brake pad and the brake disc.When the rust is more serious, the brake pads can be removed for polishing so that the brake discs can continue to be used.However, if the rust is too serious to be resolved by sanding, a new brake disc must be replaced.

There are some disadvantages to polishing brake discs：

After the brake disc is polished, the distance between the brake pads and the brake pads will change. Even if the gap between the brake pads and the brake pads is small, it may cause the brake effect to deteriorate.；
After polishing the brake disc, the service life of the brake disc will be shortened；
The brake discs will become thinner after polishing, and the braking effect will also be affected.
Under normal circumstances, when the vehicle travels to 60,000 to 70,000 kilometers, it is necessary to consider replacing the brake discs.Of course, the specific replacement time needs to be determined according to the owner's driving environment and habits.If the owner often slams on the brakes, or the driving environment is poor, the brake discs may need to be replaced when driving 50,000 kilometers.Conversely, if the owner's driving habits are good and the driving environment is not humid, the brake discs may be used for 100,000 kilometers without problems.

In summary, whether the brake discs need to be polished or replaced, the degree of wear of the brake discs and the specific circumstances of the owner need to be considered comprehensively to ensure the safety of the vehicle and the braking effect.

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