Is it necessary to change the rear brake disc? One pair of brake discs or four?
Whether the rear brake disc needs to be replaced depends on a number of factors, including the degree of wear and thickness of the brake disc, and whether there are abnormal sounds or scratches. Here are some criteria to judge:
Degree of wear: When the brake disc is worn to a certain extent, it needs to be replaced. In general, when the thickness of the brake disc is worn to one-third or less than 5 mm, it is recommended to replace it.
Thickness: The thickness of the new brake pads is generally about 15-20mm. When the thickness of the brake pad is observed with the naked eye, it is only 1/3 of the original, and the brake disc needs to be replaced.
Abnormal sounds or scratches: If there is obvious wear or scratches on the surface of the brake disc, or you hear a silk pull sound, or the brake disc warning light is on, these are signals that the brake disc needs to be replaced.
In addition, if the vehicle is under warranty, replacing the non-original brake disc may affect the warranty, because the 4S shop usually only recognizes the quality of the original brake disc. Therefore, when deciding whether to replace the brake disc, the owner should consider the above factors and decide according to the actual situation and the specific situation of the vehicle. If you are unsure, it is recommended to consult a professional car maintenance personnel in time to ensure driving safety.
The number of brake discs to be replaced depends on a number of factors, including how worn the brake discs are, how far the vehicle has traveled, and how the brake discs are being used.
Brake disc wear degree. If the wear degree of the four brake discs is similar and is close to or exceeds the wear limit, it is recommended to replace all four brake discs at the same time to ensure the uniformity of the braking effect and improve driving safety. If the degree of wear of the brake disc is different, it can be considered to replace only the brake disc with severe wear, but doing so may cause the new brake disc and the old brake disc to differ in braking effect, which may affect the braking stability and safety of the vehicle.
The mileage of the vehicle. The replacement cycle of the front brake disc is usually 60,000 to 80,000 kilometers, and the replacement cycle of the rear brake disc is usually about 100,000 kilometers, but this will also be affected by personal driving habits and driving environment.
Warning light. If the brake disc's warning light is on, the loss of the brake disc may have reached its limit and needs to be replaced.
Therefore, it is best to decide the number of brake discs to replace according to the advice of professional car maintenance personnel.
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