Methods for handling brake pad noise

1、 Make a sound

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

Human factors:

1. It makes a noise after removing the original car parts and replacing them with new ones.

At present, according to the actual situation, the probability of the original brake pad scratching the original brake disc is over 50%. However, firstly, because it is an original car part, and secondly, because it is only scratched and does not make a sound, 90% of repair shops and drivers do not believe that the original brake pad is damaged. Therefore, when replacing a new piece, they often do not actively check whether the brake disc has scratches. Only when the replacement piece makes a sound do they discover that there are scratches on the brake disc. This often leads to drivers demanding compensation from the repair shop, dealer, or manufacturer who replaced the new disc. This is clearly due to human factors being blamed.

Solution: When replacing brake pads, it is necessary to first check for scratches on the brake disc. If there are scratches, it is recommended to smooth them out or replace the disc with a new one. If the driver does not agree, it should be noted on the repair order and signed by the driver to avoid future claims from the driver due to noise or damage to the disc.

2. The surface of the brake disc is flat, but there is a noise when the new disc is installed.

A: The first reason for this may be that the repairman installed the brake pads off center, and when removed, it can be seen that there are only local friction marks on the surface of the brake pads. Solution: It can be disassembled and reinstalled. B: The second reason is that currently, the friction block sizes of the same type of brake pad vary among manufacturers in China, especially in terms of the width of the friction block. The maximum size deviation between manufacturers can reach three millimeters. This leads to a situation where although the surface of the brake disc appears smooth, larger brake pads will still make noise if they are installed on brake discs that have been rubbed by smaller brake pads. Solution: First, use a CD. If not, you can drive for a period of time until the marks match, and then there will be no noise. C: The third reason is that there is a sudden noise after driving for a period of time, which is mostly due to hard objects on the road such as sand and gravel, iron scraps, etc. getting stuck on the brake pads when stepping on the brakes. This situation not only makes noise, but also easily damages the disc. But sometimes when disassembled for inspection, foreign objects may have fallen off or been worn off. Handling method: If there are foreign objects on the disc, they should be removed before installation. This situation often only damages one of the four surfaces of two discs, which is easy to see. But if the driver is not explained the reason, it is easy to incur claims. D: It makes a noise after driving for a while. But it's not a squeaking sound, it's a rattling sound, which may be caused by loose attachments on the brake pads. Solution: Re tighten or replace with a new piece.

Product factor: The noise referred to here refers to the noise produced when the surface of the brake disc 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 have generally achieved this, while some small manufacturers are still producing and selling asbestos containing brake pads. Although semi metallic asbestos free brake pads have a long driving range and are beneficial for environmental protection and personal health, the material is relatively hard, while asbestos brake pads, due to their soft material, often do not make a sound even if there are scratches on the brake disc, and the braking feeling is soft. In this case, if a new pad makes a sound, it can only be replaced.

2、 Injury disk

The damaged disc referred to here refers to the damaged disc on the smooth and flat surface of the brake disc, which is caused by uneven mixing during the production process of the manufacturer, except for foreign objects caught by the brake pads during driving. In fact, due to cost reasons, the hardness of brake discs is not as good as before. Even the original brake discs are generally not as hard as before, which makes semi metal brake pads particularly prone to disc damage. As long as there are slight scratches, that is, the scratch depth does not exceed 1 millimeter, there is no need to replace the disc. Just flatten the disc and continue to use it.

3、 Friction block falls off or falls off

(1) If the color of the friction block remains unchanged and falls off, it is a product quality issue. A new film should be replaced.

(2) After the friction block changes color and falls off or falls off, the reasons can be divided into the following: A. The brake caliper does not return to its original position. If the brake caliper does not return to its original position for a long time, it will cause the temperature of the brake pads to be too high, resulting in the erosion and deterioration of the friction material, or the failure of the adhesive. In this case, the friction material will turn red or yellow, which is not a product quality issue, but it needs to be replaced with a new one and the brake caliper repaired. B, Long term braking can cause debris or detachment. This situation occurs more frequently in mountainous areas and on highways. In mountainous areas, due to steep slopes and long roads. Experienced drivers use point braking for downhill driving, but novices often brake continuously for a long time, which can easily cause the disc to burn, fall off, and become red or yellow in color. In addition, when driving on highways, due to good roads and good vehicles, drivers often exceed the safe speed of 110 kilometers per hour, sometimes even reaching over 200 kilometers per hour. In emergency situations, braking often loses its effectiveness and requires continuous braking. This type of long-term braking often causes the film to burn, fall, slag, and block. The color of the film will also change to red or yellow. C, The occurrence of slag and block falling in items A and B above is not the responsibility of the product, and the manufacturer shall not be held responsible.

4、 Brake failure

(1) The brake failure of a newly installed brake is often caused by the artificial addition of oil or grease on the surface of the brake pad during installation. This is not the responsibility of the product, and the manufacturer will not be held responsible if any oil stains can be detected after removal. The driver can only replace the brake pad.

(2) After driving for a period of time, the brakes fail. This situation mostly occurs when there is water accumulation on the road surface, and the brake is pressed when passing through a puddle. High temperature plates and discs will quench when exposed to cold water, forming a hard oxide layer on the surface of the plate. The surface is hard and the material changes from normal white to blue or blue red alternating colors. In this situation, it is also necessary to replace the brake pads and brake discs. But it does not belong to product quality responsibility.

5、 Supplementary explanation

(1) When replacing the brake disc, it is necessary to first check whether it is smooth and flat. If the brake disc is uneven, it should be replaced or smoothed. If the driver refuses the above suggestion, it must be noted on the repair order to avoid future claims.

(2) Once the car owner reports a problem, it is best to find the vehicle for inspection as soon as possible to determine responsibility. In many cases of the above-mentioned faults, if detected in a timely manner, responsibility can be determined. However, if not detected in a timely manner, it can easily lead to missing evidence and trigger claims.

(3) Under normal circumstances, if the surface of the brake disc is smooth and flat like a new disc. Even the hardest brake pads will not cause significant scratches on the surface of the brake disc within 5000 kilometers.

(4) Asbestos containing brake pads have been banned by the government due to their high risk of causing cancer. But there are still non-standard manufacturers producing and selling. For your and others' health, please refuse to purchase and use asbestos containing brake pads.