Brake pad sound treatment method

First, make a sound

The sound is mainly caused by human factors and product factors.

Human factors:

1. After removing the original car film and replacing it with a new one, it will sound.

At present, according to the actual situation, the probability of the original car brake pad scratching the original car brake disc is more than 50%, but one is due to the original car parts, and the other is because it is only scratched and does not ring, so 90% of the repair shop and drivers do not believe that the original car film is injured disc, so when replacing the new film, they often do not take the initiative to check whether the brake disc has scratches, and wait until the new film rings again. It was found that there were scratches on the brake disc, which often led to the driver asking for the repair shop, dealer, and manufacturer to compensate for the brake disc. This is clearly a human fault.

Treatment: When replacing the brake pad, you must first check the brake disc for scratches. If there are scratches, it is recommended to smooth the scratches or replace the new disc. If the driver does not agree, it should be indicated on the maintenance order and signed by the driver, which will avoid later ringing or injury and lead to claims by the driver.

2. The surface of the brake disc is flat but the new film is ringing.

A: The first of these reasons may be that the repairman installed the brake pad off, you can see that the brake pad surface is only local friction marks. Solution: You can remove it and reinstall it. B: The second reason: At present, between domestic manufacturers, the size of the friction block of the same type of brake pad is inconsistent, especially the width of the friction block, and the size deviation between manufacturers can reach up to three millimeters. This causes the surface of the brake disc to look smooth, but the size of the large brake pad if installed on the size of the small brake pad friction on the brake disc will also ring. Processing method: The first disc, if not the disc can be driven for a period of time, and it will not ring after the trace is matched. C: The third reason, the sudden sound after a period of driving, most of which is due to the hard things on the road such as sand, iron scraps, etc. when stepping on the brake. This situation is not only loud, but also easy to hurt the disc. However, when it is removed for inspection, sometimes the foreign body has fallen off or worn away. Treatment: CD, if there is a foreign body on the film should be removed and then installed. In this case, it is easy to see that the injured disc is only one of the four surfaces of the two discs. However, if the driver is not explained, it is easy to incur claims. D: It sounds after driving for a while. But instead of squeaking, there was a clatter, which could be caused by a loose attachment on the brake pads. Treatment: re-tighten or replace the new film.

Product factor: The sound mentioned here refers to the sound when the brake disc surface is completely smooth and flat. The reason is that the current national regulations prohibit the use of asbestos-containing brake pads, but large domestic manufacturers generally do, and 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 feeling is soft, in this case, the sound can only be replaced by the new film.

Second, injury disk

The injury disc referred to here refers to the injury disc under the condition of smooth and flat brake disc surface, in addition to the brake pad clamping foreign bodies during driving, it is due to the uneven mixing in the production process of the manufacturer. In fact, now the brake disc due to cost reasons, the hardness has been much less than before, even the original car brake disc is generally not as hard as before, which leads to semi-metal brake pads especially easy to hurt the disc, as long as it is a slight scratch, that is, the scratch depth does not exceed 1 mm, there is no need to change the disc, as long as the disc light flat can continue to use.

Third, the friction block slag or fall off

(1) If the color of the friction block does not change and the slag is a product quality problem. The new film should be replaced.

(2) The friction block after the change of color drop or fall off, the reasons can be divided into the following: A, the brake caliper does not return, the brake caliper does not return for a long time, will cause the brake pad temperature is too high, resulting in friction material ablative deterioration, or adhesive failure, in this case, the friction material becomes red or yellow, this does not belong to the product quality reasons, but must be replaced and repair the brake caliper. B, prolonged braking leads to slags or falling off. This situation is more in the mountain area, the second is more in the highway. The road is long in the mountains because of the steep slopes. Experienced drivers use braking downhill, but novices often brake continuously for a long time, which is easy to cause the chip to ablate slag and block, the color of the slag and block will also become red or yellow, and then the highway driving, because the road is good, the driver often drives faster than the safety speed of 110 km/h, sometimes even more than 200 km. In the event of an emergency, the point brake often loses its function and must be continuously braking. This kind of long time braking often also causes the chip to ablate the slag and remove the lumps. The film will also change color to red or yellow. C, in the above two items A and B, the slag stripping, does not belong to the product responsibility, the manufacturer does not assume responsibility.

Four, brake failure

(1) The new film just installed is brake failure, which is often due to the installation of the film surface is artificially caused by oil and other grease, this does not belong to the product responsibility, after removal can be detected there is no oil manufacturers will not be responsible, the driver can only change the new film.

(2) The brake fails after driving for a period of time. Most of this happens when the road water, just in the puddle when the brake, high temperature film and disk will be quenched in cold water, the disk surface of the film to form a hard oxide layer, the surface is hard and the material from the normal white to blue or blue and red color. In this case, the brake pads and brake discs must also be replaced. But does not belong to the product quality responsibility.

V. Supplementary explanation

(1) When changing the disc, you must check whether the brake disc is smooth and flat. If the brake disc is uneven, it should be replaced or smoothed out. If the driver refuses the above suggestion, it must be indicated on the maintenance order to avoid future claims.

(2) Once the owner reflects the problem, it is best to find the car for inspection in the first time in order to judge the responsibility. If there are many cases in the above faults, if the detection is timely, the responsibility can be determined, but if it is not timely detection, it is easy to cause evidence loss and cause claims.

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

(4) Brake pads containing asbestos are easy to cause cancer, and the state has explicitly prohibited their use. But there are still non-standard manufacturers in production and sales. For the health of yourself and others, please refuse to buy and use brake pads containing asbestos.