Brake problem, there is an abnormal noise after braking, what s going on

1. The run-in of the new car, in which the run-in of the brake pads is a very important link, usually after running hundreds of kilometers, you can feel that the brakes will be more comfortable.

2. The new brake pads also need to be better combined with the old disc through running-in, and when you first put it on, you will feel that the brakes are very hard, and you usually need to drive hundreds of kilometers to feel better.

3. During the driving of the vehicle, there may be very fine sand particles into the middle of the piece and the plate, and sometimes there will be abnormal noise due to friction, which generally does not need to be maintained, and it is good to run a small sand particle to fall out.

4. For those who do not have a good run-in and abnormal noise, some car owners simply run up and slam on the brakes, so that the brakes can be run in in a short time, but this will make the brake pads wear more severely, that is, it is equivalent to reducing the service life of the brake pads, so it is recommended that you still run for a period of time to observe, and do not artificially force the wear of the brake pads. Missing or damaged fixing screws of the brake disc can also cause abnormal brake noises.

5. The brake system is faulty, which needs to be inspected and repaired.

The brakes will ring, and there are several cases. First, the quality of brake pads; Second, the brake pads are almost finished; As far as you say that there is an oil leak on the front wheel, it can be roughly analyzed that there is oil dripping on the brake pads or brake discs, which fouls the brake pads and causes the brake to sound. Because the brake pad is a composite body, it is a grinding body composed of many medium materials, and if there is oil, when the brake pad and brake disc are polished, there will be a slippage, resulting in a sound.

If it's slight, it's okay to press the brakes a few more times, and if there is a lot of oil, you need to replace the brake pads!!

After the automobile brake disc and brake pad are used to a certain mileage, due to the braking, friction produces a large amount of heat and debris, and the thermal stress of high temperature will produce deep scratches and surface grooves on the working surface of the brake disc, and it will also cause the brake pad to be worn to varying degrees, and the brake pad will become very hard with the continuous extension of the use time.

The braking force is determined by the friction between the brake pad and the brake disc to produce strong resistance, so as to achieve the effect of braking, and the braking force is as follows: compression force (thrust of the brake cylinder), friction coefficient (material related), contact area (the contact surface between the brake pad and the brake disc is determined, under the condition that the first two items remain unchanged, the larger the contact surface, the greater the braking force generated, and the better the braking effect. The old brake pad is used together with the new brake disc, and the contact area is relatively small, and it is easy to cause the new brake disc to appear slotted again (because the old brake pad has been slotted), and the braking effect can not be achieved, so it needs to be replaced together ideally, and the new brake pad is run in with the new brake disc, so that the new brake disc can avoid the new ring slot in a relatively short period of time.

The possible causes of abnormal noise during braking are as follows: 1. Wear of brake pads or brake discs. 2. There is a foreign object between the brake pad and the brake disc.

3. Assembly problems of brake pads or brake calipers. 4. The return piston of the brake cylinder is too dirty. Extensions:

1. Downhill can not be neutral slide by brake control, many people downhill may choose to slide in neutral gear, with brakes to control the trembling system, feel that this is so fuel-efficient, in fact, this is a misunderstanding of the hole. Coasting downhill in neutral gear and using the brake to control the distance of the car is likely to cause the brake system to overheat and malfunction for a long time, which will lead to accidents. 2. When encountering downhill slopes, you should hang the appropriate gear according to the speed of the vehicle, brake through the engine, and occasionally supplement the brake, which is both safe and respectful to prolong the life of the brake.

Generally speaking, there are five reasons for the abnormal noise of automobile brakes: 1. The thickness of the automobile brake disc, brake disc, and circumferential direction changes; 2. Automobile brake discs, brake discs, deformed or improperly assembled; 3. Automobile wheels, wheels, deformed or surface defects; 4. There is oil on the surface of the wheel, wheel, and brake disc or between them; 5. Automobile brake friction material.

The brake pads may be stained with fine particles and foreign bodies, resulting in abnormal noises during braking, and the gap between the brake calipers and brake pads is too large or too small, which is also easy to cause brake system noise.

On the issue of abnormal noise of automobiles, it is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are reasonable abnormal noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. In the case of a turbocharged engine, there is a must be a difference between the sound and the sound of a naturally aspirated engine; Models with engine guards may also make noises due to friction; After some car owners come into contact with different cars, it is likely that they lack their own understanding of mechanical knowledge, so they can distinguish the abnormal noise of the car and avoid wasting time and energy.

How to identify the sound of a car:

In practice, due to the limitations of working conditions, it is difficult to measure the sound of the car with special instruments, and the sound of the car can only be described and compared with the judgment of the sound in daily life. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal and abnormal sounds.

The vibration of each mechanism in the work of the car will emit a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal noise. The normal vibration sound of each system component (such as the noise on the surface of the engine), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the flashover sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal operation of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of other noises, so as not to affect the accuracy of judgment.

It is best to consciously amplify or reduce the sound, that is, use a screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize human interference.

If there is an abnormal noise, there may be the following reasons: 1. The hardness of the brake disc is different during manufacturing, resulting in different degrees of wear, which will not have much impact. If the sound you hear is in the cab (at the brake pedal), it may be due to the wearing of the nylon bushing on the brake pedal fixing bracket and the sound of the brake pedal fixing pin rubbing against him.

2. The wear of the disc is very serious, and there is a direct contact with the iron parts. How to solve the problem: (1) If it is the cause of the hard point, the easiest way is to step on the hard point when the speed of the sports car is about 5 kilometers backwards, and you can generally remove the hard point.

The sound is not too loud, it is recommended or ignored, and it has no effect on driving. (2) If it is iron-to-iron, the disc should be replaced immediately. In addition, at this time, the brake of the instrument does not alarm, and the sensor connected to the brake fault light should be checked at the same time.

There are many reasons for abnormal brake noise, some are faulty and some are normal. It is necessary to analyze the specific problems in combination with the situation of the vehicle at that time.

1. There is a clicking sound when braking suddenly. This is to prevent lock-in ABS pumps to intervene to control brake oil pressure changes back and forth. This is normal sound. In addition to the click, it often manifests as a brake pedal vibration.

2. The brake clicks when starting to refuel. This is normal. This is mainly the case after parking on rainy days or for long periods of time. This is mainly due to the fact that the brake pads are attached to the brake disc. A few stomps can eliminate the malfunction.

3. Abnormal noise when stepping on the brakes in the reversing state. In this case, the reverse vehicle changes its direction of movement, and the engine as a whole will show signs of forward and backward tilt, and the engine vibration will be reduced when the brakes are pressed. If the lower guard plate is not installed properly or deformed in a collision, it will be in direct contact with the exhaust pipe and a sound will occur.

4. Squeak when braking. This kind of situation needs to be noted, and there are generally two situations. One is that the brake pads are worn to the limit, and the alarm limit pads on the brake pads interfere with the brake discs.

Another possibility is that foreign objects such as stones or powder particles from the wear of the friction pads fly into the brake pads and rub against the brake disc during driving.

In this case, we can pull over first, check the brake disc for foreign objects, wait three to five minutes, and rinse it with water. If you drive again to see if there is a sound, you can press the brakes several times in a row.

5. The brake of the shock absorber belt makes a clicking sound. This sound is due to the excessive gap between the brake cylinder pin and the caliper. In addition to piggybacking on the brakes, there is also a phenomenon where the vehicle turns off and there is a click when getting out of the car.

To determine whether this is the fault, we can add lubricating grease to the sub-pump pin to compensate for the gap between the two, and the abnormal noise will disappear. But it didn't take long for the glitch to reappear. So if you can't stand it, it is recommended to replace it directly.

The first step is to determine what type of abnormal noise it is, if it is a scream, a screeching scream of metal rubbing during the braking process, and it will be very uncomfortable and embarrassing to hear it, then what should you do in this situation?

The second step, the way to solve the screaming:

The first thing to check is to despise the brake pads that are running out (the alarm pads sound). If the brake pads are used up, then a new pair of brake pads need to be replaced for a long time, usually there will be an alarm iron pin on the brake pads, and the brake pads will be worn to a certain extent, and the iron pin will rub against the brake disc, so there will be a scream of metal friction;

If it is a new film, then check whether there is any foreign object caught between the brake disc and the plate.

The third step, if the newly replaced brake pads, there is no foreign matter between the discs, in this case, it should be because there is a running-in period between the new brake pads and the old brake discs, which can be processed by polishing the brake pads, and the fourth step, if it is muffled and the sound is very dull, in this case, the brake calipers should be checked, such as the wear of the movable pin, the spring blades falling off, etc., these situations can not be found by themselves, and they need to go to the auto repair shop to deal with them, so that the auto repair master can check it.

Fifth, if it is a slight call, then there are more problems, calipers, brake discs, brake pads may have problems. If the sound is continuous, first check whether there is drag, poor caliper reset will cause the disc to rub against the disc for a long time, and under certain conditions, it will make abnormal noise. Then check whether there is any foreign object stuck between the disc and the disc.

If it is a new film, it depends on whether the brake disc is grooved, because local friction will cause abnormal noise. If there is no problem with the disc, then consider whether the brake pads are too stiff or the muffler is installed incorrectly.

Finally, the braking system is no trivial matter, if there is a problem, go to the 4S shop or auto repair shop to check, it is best to find a car repair shop that you are more familiar with, to avoid being pitted, which is very important. The car is the same thing as a woman, it needs to be maintained, the woman will be moist and beautiful if it is well maintained, and the service life of the car will be extended if it is well maintained, there is no big problem, and you can drive it yourself to save costs and worry.

Hello, brake abnormal noise to brake disc and the front wear difference is the most, in the case of no impact on braking performance is a normal sound (disc groove, sand, water caused), if the brake system has not been maintained for a long time or the brake performance is abnormal, it is recommended that you go to a professional repair shop for maintenance, safety first, I hope to help you.

Hello. If the brakes are weird. First of all, check the thickness of the car's brake pads. The second is to check the brake pads of the car for spilled foreign objects.

The brake discs and pads are worn.

What's the deal with the rattling noise?