BMW 3 Series has abnormal noise when stepping on the brakes.

What is the reason for the abnormal brake sound of BMW 3 Series?

There are many reasons for the abnormal sound of BMW 3 Series brakes, which may be: excessive wear of brake pads; Brake cylinder failure; Suspension system or pressure-bearing rubber ages and hardens; Brake oil is aged and dirty; Brake disc wear and deformation, etc. There are many cases that cause abnormal braking sound, and it is necessary to check them one by one to find out the causes of abnormal braking sound, so as to effectively solve the problem. Below, briefly introduce several causes of abnormal sound of lower brake and corresponding solutions: 1. Excessive wear of brake pads. According to the working principle of brake pads, work is bound to be accompanied by friction, which will lead to loss. When the loss reaches a certain level, the brake pad will lose its braking function. If the abnormal noise is caused by the friction of brake pads, it is necessary to replace the brake pads in time, which can not only solve the abnormal noise, but also play a very important role in driving safety. 2. The suspension system or pressure bearing produces abnormal sound. This abnormal sound is generally caused by rubber strip hardening of parts, and it will be caused by resistance when braking. If rubber strip is aging, it should be replaced. If rubber strip is hardened just because of the cold weather, there is no need to deal with it. When the weather is warm, the elasticity of rubber strip will recover. 3. The brake disc is worn or deformed. Like brake pads, abnormal noise will be generated due to friction loss, excessive wear or deformation during braking. The correct way is to check and evaluate the brake disc after using it for a period of time, and maintain and replace it in time to ensure driving safety.