Here is a professional BMW Brake Pad Factory talking about reasons for abnormal sound of brake pads.
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(1) The abnormality of the brake pads caused by the slag or falling off of the friction block
1. Long-term braking can easily lead to slag or falling off. This situation is mainly seen in mountainous areas and highways. In the mountains due to the steep slope. Experienced drivers will use the brakes to descend the slope, but the novices often brake for a long time, which will easily cause the film to ablate and slag, or the driver tends to travel faster than the safe speed when driving on the highway. In the event of an emergency, the brakes often lose their effect and must be braked continuously. This kind of long-term braking often causes the film to ablate and slag and block the block, resulting in abnormal sound of the brake pads.
2. If the brake caliper does not return for a long time, the temperature of
the brake pad will be too high, causing the friction material to ablate and
deteriorate, or the adhesive will fail and cause abnormal noise.
(2) The brake pump rusts
If the brake oil is not replaced for a long time, the oil quality will deteriorate, and the moisture in the oil will react with the sub-pump (cast iron) to rust.
(3) Hand killing cable is not live
If one of the two hand-crushing wires does not work, it will cause the brake pads to be different. At this time, you can adjust or replace the hand-pull cable.
(4) The brake master cylinder returns slowly
The brake master cylinder returns slowly, and the brake cylinder return to the abnormal position will also cause the brake pedal to be abnormal.
There are so many reasons for the abnormal sound of the brake pads, so how to deal with the abnormal situation of the brake pads, first of all we have to analyze which kind of abnormal sound is in the targeted treatment.
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