Because of its working characteristics, the brake system has been working in a very bad environment, such as rain, freezing, wind and sun, sand, bump, corrosion, etc. if the brake system fails, there are always potential safety hazards, so it is necessary to regularly check and maintain the brake system. Although some car owners attach great importance to the brake system, they don't have a deep understanding of it. They will be at a loss when encountering abnormal conditions such as brake pad noise, drag, brake pad carbonization, insufficient braking force, brake pedal softness, brake pad abnormal wear, etc. What are the causes of this series? Let's get to know. 1. When the car stops, the worn powder of the brake pad will be left near the brake cylinder, and if it is not cleaned for a long time, it will cause abnormal brake noise. 2. When the car is driving on the gravel road, there will be particles splashing between the brake pad and the brake disc, so it will cause abnormal noise or abnormal wear. 3. In case of no cleaning and lubrication for a long time, the shock absorbers of sound-absorbing pads and brake pads will make the brake abnormal. 4. If the dust boot of the sliding shaft of the cylinder is worn, the cylinder shaft will be embroidered, the cylinder will not return, the braking force will be reduced, and the brake will run off. 5. If the brake caliper or caliper groove is rusted, resulting in abnormal return of the brake pads, it will cause drag and carbonization of the brake pads.