Seven reasons why brake pads ring abnormally

(a) replacement of the original car brake pads, caused by human factors

1, it may be that the repairman installed the brake pad, and when it is removed, you can see that the surface of the brake pad is only local friction traces. At this point you get the 4S shop to remove and reinstall.

2. After driving for a period of time, it suddenly rings, most of which happen to be hard things such as sand and iron scraps on the road when stepping on the brake, in which case you can go to the 4S shop for cleaning.

3, due to the manufacturer's problem, as a type of brake pad friction block size is inconsistent, especially the width of the friction block, some manufacturers between the size deviation can reach three millimeters. This causes the surface of the brake disc to look smooth, but the large brake pad will also ring if it is mounted on the brake disc that the small brake pad has rubbed against. In such a case, you need to first CD, if not CD can travel for a period of time, and so the trace will not ring after the match.

(2) brake pad material and other product factors caused by noise

If the brake pad material is harder and worse, such as the prohibition of the use of asbestos containing brake pads, but some small manufacturers are still producing and selling asbestos containing brake pads. Semi-metal asbestos-free brake pads although the mileage is long, conducive to environmental protection and human health, but the material is hard and asbestos brake pads due to soft material, often even if there are scratches on the brake disc will not ring, and the brake feels soft, if this is the case of the sound you can only replace the new film.

(3) Abnormal sound of brake pads caused by injury discs
The injury disc referred to here refers to the injury disc in the case of smooth and flat brake disc surface, in addition to the brake pad clamping foreign bodies in the driving process, and is caused by uneven mixing in the production process of the manufacturer. Now the brake disc due to cost reasons, the hardness is much less than before, which leads to semi-metal brake pads are particularly easy to hurt the disc and produce abnormal sound.

(4) Brake pad abnormal sound caused by friction block falling slag or falling off
1, a long time of braking is easy to lead to slag or fall off. This situation is mainly in mountainous areas and highways appear more. In the mountains the slopes are steep and long. Experienced drivers will use the spot brake downhill, but novices often continuous braking for a long time, so it is easy to cause the chip ablation slag off, or the driver often travels faster than the safe speed when driving on the highway. In the event of an emergency, the point brake often loses its function and must be continuously braking. This kind of long braking often causes the chip to ablate the slag and remove the block, resulting in abnormal brake pad noise.

2, the brake caliper does not return for a long time, which will cause the temperature of the brake pad to be too high, resulting in the ablative deterioration of the friction material, or the failure of the adhesive resulting in abnormal sound.

(5) Brake pump rust

If the brake oil is not replaced for a long time, the oil will deteriorate, and the moisture in the oil will react with the pump (cast iron) to rust. Resulting in friction abnormal sound

(6) The thread is not alive
If one of the two hand pull wires is not alive, it will cause the brake pad to be different, then you can adjust or replace the hand pull wire.

(7) Slow return of the brake master pump
Slow return of the brake master pump and abnormal return of the brake sub-pump will also lead to abnormal brake pad sound.

There are so many reasons for the abnormal ring of brake pads, so how to deal with the abnormal ring of brake pads, first of all, we have to analyze what kind of abnormal ring of the situation and then targeted processing.