The main cause of human factors and product factors. Human Factors:

1. Remove the original car and replace it with a new film.

At present, according to the actual situation, the original car brakes are more than 50% more likely to scratch the original brake discs, but because of the original car parts, and because the scratches are not sounded, 90% of the repair shops and The driver does not believe that the original car has a broken disc, so when replacing a new film, it is often not proactively checking whether the brake disc has scratches. When the new film is re-sounded, it is found that there are scratches on the brake disc, which often leads to the driver. Repair repair shops, dealers, and production plants that require new films to compensate for brake discs. This is a black pot that is obviously caused by human factors.

2. The surface of the brake disc is flat but the new piece is sounded.

A: The first reason for this may be that the repairman has biased the brake pads. When removed, you can see that the surface of the brake pads is only partially scratched. Processing method: You can remove and reinstall. B: The second reason: At present, the size of the friction block of the same type of brake pad is inconsistent among the domestic manufacturers, especially the width of the friction block, and the dimensional deviation between the manufacturers can reach up to three millimeters. This results in a smooth surface of the brake disc, but a large-sized brake pad can also sound if it is attached to a brake disc that has a small brake pad.

Processing method: First CD, if you don't have a CD, you can drive for a period of time. After the traces match, it will not sound. C: The third reason is that after a period of driving, it suddenly sounds. This is mostly due to the fact that hard objects such as sand and iron scraps on the road are caught on the brake pads when the brakes are applied. This situation is not only audible, but also vulnerable to damage. However, when the inspection is removed, sometimes the foreign matter has fallen off or worn away. Processing method: CD, if there is foreign matter on the film, it should be removed and then installed. In this case, it is easy to see that the wound disc only hurts one of the four surfaces of the two discs. However, if you do not explain the reason to the driver, it is easy to incur a claim. D: It sounds after driving for a while. But it is not a buzzing sound, but a squeaking sound, which may be caused by the loose attachment on the brake pads. Handling: Retighten or replace the new piece.

Product factor: The sound mentioned here refers to the sound when the surface of the brake disc is completely smooth and flat. The reason is that the current state regulations prohibit the use of asbestos-containing brake pads, but domestic manufacturers have generally done, and some small manufacturers are still producing and selling asbestos brake pads. Semi-metal asbestos-free brake pads have a long driving range, which is good for environmental protection and personal health. However, the material is hard and the asbestos brake pads are soft because of the material. Even if there are scratches on the brake disc, they will not ring, and the brake feels soft. The situation can only be replaced with new ones.

The wound disc mentioned here refers to the wound disc under the condition that the surface of the brake disc is smooth and flat. Except for the foreign matter caught in the brake pad during driving, it is caused by uneven mixing during the production process of the manufacturer. In fact, due to the cost of the brake disc, the hardness is not as good as before. Even if the brake disc of the original car is generally less rigid than before, this will cause the semi-metal brake pad to be particularly prone to damage. As long as it is slightly scratched, the scratch depth is not more than 1 mm, there is no need to change the plate, just keep the plate flat and continue to use.

(1) If the color of the friction block is not changed and the slag is removed, it is a product quality problem. A new film should be replaced.

(2) After the friction block is discolored, it will fall into the slag or fall off. The reasons can be divided into the following types: A, the brake caliper does not return, and the brake caliper does not return for a long time, which will cause the brake pad temperature to be too high, resulting in friction material ablation. The quality, or the adhesive fails. In this case, the friction material turns red or yellow. This is not a product quality reason, but a new piece must be replaced and the brake caliper repaired. B, long-term brakes cause slag or fall off. This situation is more common in the mountains, and second, there are more on the highway. In the mountains due to the steep slope of the road. Experienced drivers use the brakes to go downhill, but the novices often brake for a long time, which is easy to cause the film to ablate and slag, and the color of the slag will turn red or yellow. Driving, because the road is good, the driver often travels faster than the safe speed of 110 km / h, and sometimes even more than 200 km. 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 deblocking. The color of the film will also change to red or yellow. C. In the above A and B items, the slag deblocking is not a product liability, and the manufacturer is not responsible.

(1) The new film on Gang'an is the brake failure. This is often caused by the grease on the surface of the film when it is installed. This is not a product liability. After the removal, it is a manufacturer that can detect the presence or absence of oil. Will be responsible, the driver can only change the new film.

(2) The brakes fail after driving for a while. Most of this happens when the road area is water. When the water is over the puddle, the brakes are applied. The high temperature film and the plate will be quenched when it meets the cold water. A hard oxide layer is formed on the surface of the disk. The surface is hard and the material is normal. White turns blue or blue and red. In this case, the brake pads and brake discs must also be replaced. But it is not a product quality responsibility.

(1) Before changing the film, you must first check whether the brake disc is smooth and flat. If the brake disc is replaced or the brake disc is flat, if the driver refuses the above suggestions, it must be indicated on the repair order to avoid future claims.

(2) Once the owner reflects the problem, it is best to find the car for inspection at the first time in order to judge the responsibility. If there are many situations in the above-mentioned faults, if the inspection is timely, the responsibility can be determined, but if it is not detected in time, it will easily lead to the lack of evidence and trigger the claim.

(3) Under normal circumstances, if the surface of the brake disc is smooth and flat, it is like a new disc. Even the hardest brake pads will not cause significant scratches on the brake disc surface within 5,000 km.

(4) Asbestos-containing brake pads are banned due to their tendency to cause cancer. However, there are still non-standard manufacturers in production and sales. For the health of you and others, please refuse to buy asbestos-containing brake pads.