What should I do when the brakes are abnormal?
Date of issue:2017-12-04 00:00 Source:http://en.chezvi.com Click:
When the car brakes abnormal noises or even “screams”, we subconsciously think that the car is out of order. The brakes are malfunctioning. When you go to the 4S shop repair factory for inspection, the general maintenance personnel will also push the boat and tell you Some parts of the brake system are "bad" and need to be replaced. The fake "modification" will give you new accessories. When we are still in the dark, people already have bulging wallets.
Why do you say that? Because in many cases, the brakes do not sound abnormally because it has big problems, but some small problems that can be resolved quickly, and even if you do not need to solve yourself, it will be a good problem if your car is because of the above In case of "screaming", there is a great chance of going to repair and it will be slaughtered. So today Xiao Bian talks with you about the main symptoms of brake abnormal sound. After you understand it, you can avoid being pitted because of this incident.
1. "No serious problem" brake abnormal sound
A: During the "break-in" of the brake
Like many parts on a car, brakes have a "break-in period." Whether it is a new car brake or a newly installed brake disc, because at the early stage of use, because it has not yet reached a state of being in line with the brake pads, the brake disc will have a sharp “abnormal sound” when it is suddenly braked and heavily braked. Actually, this is Normal performance, we do not have to worry too much, this is not a fault. However, it is recommended that the owner carefully completes the braking process, while avoiding re-brake and emergency braking during the running-in period, because the performance of the outdated braking force during the running-in period will be compromised. This is for safety reasons.
Two: continuous re-brake
Friends who know a little about the brake system have heard the word “heat decay”. The so-called thermal decay is actually the result of excessive use of brakes in a short period of time, resulting in overheating of the brake discs, which reduces the braking force. When we drive a car in continuous re-brake, there will be a thermal decay. The two specific manifestations of thermal decay are the obvious weakening of the braking force, and the brakes will have a sharp sound that is not usually heard, which is called “unique noise”. In both cases, when the brake heat decay occurs, it is a normal performance. It is not that the brake has malfunctioned. Therefore, you should not worry about it. If the heat attenuation disappears, the abnormal sound will disappear.
2. Problems with brake abnormal sound
In addition to the above-mentioned several non-faulty abnormal sounds, there are several abnormal sounds that actually have a fault phenomenon that need our attention, but the solution is not always to change the brakes. This must be remembered.
A: The brake pads appear metal particles
Although non-environmentally friendly asbestos brake pads have now been eliminated, inferior brake pads have not disappeared, and the original factory brakes are made of semi-metallic and other non-all-metal materials, and such materials are worn to a certain degree. It is highly probable that unevenly distributed high-hardness metal particles will spread over the brake pads. When you brake, the symphony between the metal particles and the brake disc begins. . .
Although such "failures" do not cause any serious damage to the brake system, metal particles will also disappear after a period of grinding time, but such metal particles still have some bad influence on the brake discs. A friend who cares about the car can choose to replace the brake with a better one, and the trouble is resolved immediately.
Two: brake pads wear excessive
Some brake pads have a thickness warning iron plate. When the brake pads wear to the “critical point”, the thickness of the brake pads warns that the iron plates will directly rub against the brake discs, causing abnormally harsh sounds. Note that this sound can be It is much larger than the above-mentioned kinds of so-called "unique sounds", and most people can feel it.
When this happens, it proves that your brake pads have worn out and must be replaced. If you do not replace them, not only will the loud noise make you unbearable, but there will also be a problem of drastically reduced braking force, which will increase safety risks.
Brake disc wear excessive
Excessive wear of the brake pads will lead to “strange noises”. Excessive wear of the brake discs will also cause this problem. When the thickness of the brake disc is lower than the critical point, the metal edging that covers the brake discs will directly contact the brake pads. There is a huge noise, there may be problems such as brake failure, severe vibration of the car body, so you try to check the thickness of the brake disc regularly. The brake pads can be changed to the critical point and the brake disc can only be changed to this level. Really a bit late!
Three: brake disc deformation
Brake disc deformation is also one of the causes of abnormal brake sound. It is also very simple to judge whether the brake disc is deformed. If your car is accompanied by abnormal sound and jitter when you step on the brake, then most of the time, the brake disc is deformed. According to the deformation of the fault to determine whether to repair or replace, if you go to the 4S shop repairs, maintenance technicians did not even check the search requires you to replace, it is rogue, bright people!
