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Causes And Treatment Of Abnormal Sound Of Brake Pad
- Oct 19, 2017 -

Brake system is more common fault when the brake is abnormal, the failure of many owners have met. General brake noise is the vehicle when driving the brake, the brake system will issue a sharp metal friction sound, this sound often occurs after the rain.

If there is such a situation because the brake film thinning appeared backplane grinding brake disc, brake pads hard, brake pads in the foreign body will lead to abnormal sound situation, so when the brake sound when the first check the thickness of the brake pads, Thickness no problem Meng step on a few feet brakes may ease the abnormal sound problem.

The main reason for the brake noise

① running the new car, which brake pads run is a very important part, usually run hundreds of kilometers later, in order to feel the brakes will be more comfortable;

② the new brake pads also need to run through with the old disk to better integration, just put on the time, will feel very hard brakes, usually also need to open hundreds of kilometers before they can feel better;

③ vehicles driving, there may be very small sand into the middle of the film and disk, and sometimes because of friction abnormal sound, this situation generally do not need to repair, run a small sand to run out like a good The

④ for the non-running and abnormal sound, there are owners simply run up brakes, so you can run in a short time the brakes, but this will make the brake pads wear more powerful, that is, to reduce the use of brake pads Life, so it is recommended that you still run for some time to observe, do not go to the artificial wear brake pads;

⑤ the brake disc of the fixed screw is lost or damaged, will cause the brake noise;

⑥ brake system failure, which requires inspection and maintenance;

⑦ If your car is equipped with ABS that may also be involved in it;

⑧ When the brake disc wear abnormal, this is due to the brake disc surface dirty, brake disc material density is not uniform, too high operating temperature, brake disc installation torque does not match.

⑨ high frequency sounds sharp, when the brake disc and the brake disc vibration frequency of the same, they resonate produce screams.

Check that the brake disc must be inspected before replacing the brake pads; check the brake disc thickness with a caliper; reinstall the fixed brake disc bolts; measure the flatness of the brake disc surface.

⑩ generally known as caliper noise, caused by the vibration of the caliper component, may also be caused by the suspension system vibration. New car calipers or suspension systems have a slight shock, early morning sensitivity, such as winter morning, especially common. Check calipers, suspension systems and bushings.

Check the calipers: whether the rails are smooth, the piston oil seal is damaged; all the anti-noise clips and brake pads are suitable, the installation is correct; brake pads are too smooth, is overused.

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

Human Factors

1 removed the original car film after the new film

At present, according to the actual situation, the original car brakes scratch the original car brake discs in the probability of more than 50%, but because of the original car parts, and secondly because the scratches did not sound, so 90% of the repair shop and The driver does not believe that the original car film injury plate, so the replacement of new films often do not take the initiative to check whether the brake disc scratches, until the new film when the re-check, only to find scratches on the brake disc, which often leads to the driver Requires a new film repair shop, dealer, manufacturer compensation brake disc. This is obviously caused by human factors


Replace the brake pads must first check the brake disc with or without scratches, if scratches can be recommended to scratch or replace the new plate. If the driver does not agree, it should be marked on the repair sheet, signed by the driver, which will avoid the subsequent sound or injury caused by the driver claims.

2 Brake disc surface is flat but loaded with new film

The first reason:

May be repair workers to brake pads installed, you can see when the brake surface is only part of the friction traces.

Solution: you can remove the re-installation.

The second reason:

At present, the domestic manufacturers, the same type of brake pads friction block size is inconsistent, especially the width of the friction block, the size of the deviation between manufacturers up to three millimeters. This will cause the brake disc surface to look smooth, but the size of the brake pads if the size of the small brake pads to friction on the brake disc will also ring.


First disc, such as not only can drive for some time, until the traces of anastomosis will not sound.

The third reason:

● After a long period of time after the sudden attack, most of the time because of the brakes on the road when the hard objects such as gravel, iron scraps and other clips on the brake pads. This situation is not only sound, and easy to hurt the disk. But when the inspection is removed, sometimes the foreign body has fallen off or worn away.


CD-ROM, such as the film should be removed after the installation of foreign body. This is often the case of injury is just hurt the two sides of the four sides of the surface, is easy to see. But if the driver does not explain the reasons, it is easy to lead to claims.

● After a period of time after the action. But not squeaky, but crashed sound, which may be caused by loose accessories on the brake pads.


Re-fasten or replace the new film.

Product factor

Here is the sound of the brake disc surface is completely smooth appearance of the case. The reason is that the current state prohibits the use of asbestos-containing brakes, but the domestic manufacturers generally do, and some small manufacturers are still in the production and sales of asbestos-containing brake pads. Semi-metallic non-asbestos brakes Although the mileage is long, conducive to environmental protection and personal health, but the material is too hard and asbestos brake pads because of the material is soft, often even if there is no scratches on the brake disc, and the brake feel soft Kind of situation can only replace the new film.

Injury plate

Here refers to the disc is the surface of the brake disc smooth smooth case, in addition to driving the brake pads caught foreign body, is due to uneven production process caused by uneven mixing. In fact, the current brake discs due to cost reasons, the hardness has been worse than before, even if the original car brake disc is generally not as good as before, which led to semi-metallic brake pads are particularly vulnerable to injury, as long as a slight scratch, 1.5 mm, there is no need to change the disk, as long as the plate can continue to use flat.

The friction block is dregs or falls off

1, if the friction block color does not change and dross is a product quality problems. Should replace the new film.

2, the friction block after dull or fall off, the reasons can be divided into the following:

A 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 ablation, or adhesive failure, in this case, the friction material into red or yellow, This is not the cause of the product quality, but must replace the new film and repair the brake caliper.

B Brakes lead to dregs or fall off for a long time. This situation is more in the mountains more, the second is more in the highway. In the mountains due to steep road length. Experienced drivers use point brake downhill, but the novice is often a long time continuous brakes, it is easy to cause the film ablated dregs off the block, this dregs off the color will turn into red or yellow, then the highway Driving, because the road is good car, the driver often travel faster than the safe speed of 110 km / h, and sometimes even more than 200 km. In case of an emergency, the brake is often lost, must be continuous braking. This long time the brake will often cause the film to ablate the slag. The film color will change to red or yellow.

C in the A, B bin appeared in the dregs off the block, does not belong to product liability, manufacturers do not assume responsibility.