What happened when the left front wheel of the Changan van braked

I remember it was the disc brakes. I dismantled everything and saw 4 nuts. I think it's a brake pad.

Change the brake pads, they're worn.

Check for debris or damaged brake pads.

Brake pads are an accessory that cannot be ignored, if there is an abnormal state, it will affect the braking and have a great impact on driving safety.

Usually the brake pad is recommended to be inspected every 60,000 kilometers or so, according to the actual situation needs to be replaced, in fact, the replacement cycle of the brake pad does not have an accurate time, after all, different car habits will be different from the wear of the brake pad, which has been driving in the congested city for a long time, the replacement cycle of the brake pad is relatively frequent.

If the owner has a long-term abnormal sound of "iron rubbing iron" in the braking process (it may also be the effect of the run-in of the brake pads at the beginning, but the abnormal sound will not last for a long time), it may be that the brake pads have been seriously worn, and the owner needs to pay attention to whether the brake pads of the car are used for too long, and can observe the wheel brake pads to determine whether they need to be replaced in 4s.

Of course, due to the unique design of the wheels of some models, the owner can not fully observe the wear and tear of the brake pads, at this time, the owner needs to determine whether it is advisable to go to the 4S shop to replace the brake pads according to the time of use of the brake pads or the number of kilometers driven. Problems that may be caused by abnormal braking When you hear a sound when you step on the brake, please check it as soon as possible, because when you hear the sound, the performance of the brake is likely to be reduced, and in serious cases, the impact of no brake on driving safety is very large.

Due to the large number of parts, the car emits various abnormal noises, which is a fault that is difficult to repair. A technician who can solve all kinds of abnormal noises in 4S shops or repair shops must have experience and skills. Some unusual noises have no effect on driving, but they sound uncomfortable.

For example, there is abnormal noise in the car, which is usually caused by the friction and loosening of some decorative panels. However, some abnormal noises not only sound uncomfortable, but also have a certain impact on driving safety, and need to be checked and maintained in time. Today we are going to talk about the abnormal sound of the front wheels, which is common in driving.

Many people have come across or heard of it. After their car has abnormal noise, they should stop and check in time.

1.There is a clicking sound when driving, and the faster the wheels turn, the more frequent it is, especially when listening with the window open. This sound is very common and is often heard when walking on the road and when cars pass by.

Most of this noise is due to large rocks stuck in the grooves of the tire, which are higher than the height of the tire. As the wheels turn, the stone will collide with the ground and make a sound, that is, a click is heard. When you hear this sound, listen carefully to which side it is coming from, and then get out of the car to find it, focusing on the deep groove in the middle of the tire.

It's easy to find this big stone, deduct it to solve. If you can't hear which side it's coming from, you can look for each wheel without difficulty. Sometimes it's not just a big rock that makes this sound, it's also possible that it's been punctured and the big screw on the head is stuck.

It can also make a loud noise when the screw touches the ground. Therefore, if there is a clicking sound, it is best to check it in time, so that you can troubleshoot it yourself.

2.When driving at low speeds, a slight grinding sound can be heard from the front wheels, and the sound is very low, like an air leak, especially when cornering. The most likely cause is worn brake pads.

When turning, the brake pads move slightly due to centrifugal force, and the closer they are to the brake disc, the friction makes a more pronounced sound. If the brake pads grind into the alarm plate, they will make a squeaky sound. This is because the contact area between the iron plate and the brake disc is small, just like we draw iron wire on the iron plate.

If the alarm iron plate is worn, the brake pad is worn, and the iron plate of the brake pad is in contact with the brake disc. The contact area between the iron plate and the brake disc is large, so the sound is smaller instead of a sharp squeak. If you don't step on the brakes, there will be friction, so be sure to check it in time.

3.At high speeds, the front wheels buzz. There are two kinds of this sound, one is that the bearing is broken, and the other is that the tire is not wearing properly, both of which can make a buzzing sound, which is very common.

The tires are ground into a zigzag shape and make a sound when they rotate at high speeds, so it is important to rule out the cause of the tires when you inspect them. Checking a tire is easy, just touch it with your hands. Don't turn the wheels, touch the tires half a lap and feel the tread of the tires.

If it's high, it's obvious that it must be from the tires. The maintenance method is to change the tires. If the tire is normal, there is no phenomenon of one high and one low, and then further check whether there is a problem with the bearing.

Check the bearings to lift the car. After turning the wheel, listen with a stethoscope. If there is noise, it is a bearing problem and the bearing needs to be replaced.

1. It may be that the repairman has installed the brake pad off, and when removing it, you can see that there are only some friction marks on the surface of the brake pad. At this time, you will get the 4S shop to remove and reinstall.

2. After driving for a period of time, it suddenly sounds, most of which happen to be sandy and gravel, iron scraps, etc. on the brake pads when stepping on the brakes, you can go to the 4S shop for cleaning.

3. Due to the problems of 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 some manufacturers can reach three millimeters. This causes the surface of the brake disc to look smooth, but the larger brake pads will also rattle if they are fitted against the smaller pads. In such a situation, you need to take the disc first, if you don't have a disc, you can drive for a while, and it won't sound after the traces match.

If it is a new car, the new car disc and disc are in a run-in state, which leads to a variety of reasons for abnormal brake noise, rust in water, stones stuck in the middle of the disc and disc, and large metal particles in the brake pad. It doesn't matter as long as it doesn't affect the performance of the brakes.

It may be because the front arm of the left front wheel of the car is loose, it is recommended to go to a professional auto repair shop for inspection and repair in time.

Most likely, there was a problem with the brake pads, and secondly, there was a problem with that shaft of the engine.

1. Rhythmic screeching This may be a friction sound caused by the gap between the brake pad and the brake disc is too small.

2. Continuous squealing may be the bearing is broken.

3. The continuous dull sound may be a problem with the transmission shaft. Because what you said is not very specific, according to what you said, you can also experience whether the sound changes during neutral and drag gear, if so, it is likely to be the cause of the propeller shaft.

It may be because of a problem with your bearing, if your noise is particularly sharp, it may also be that your brake disc clearance may be too small, if the sound is particularly dull, it may also be that there is some problem with your drive shaft, it is best to go to the store to find a professional to help deal with it.

It may be because the brake pads are worn out more severely, so there is such a sound.

Abnormal wheel noise: Abnormal wheel noise is likely to be caused by untimely maintenance of the vehicle, or often driving on bad roads, resulting in uneven wear of tires, and serious wear of tire bearings.

It is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are imitation abnormal noises. When I went to the repair shop to inspect the vehicles on the abnormal noise bridge tour, only nearly 20% of the cars really had problems. Models equipped with turbocharged engines are different; 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 due to their lack of understanding of mechanical knowledge, they mistake reasonable abnormal noise as a vehicle failure.

Therefore, learn to distinguish the abnormal noise of the car and avoid wasting time and energy.

Second, the identification method of car noise:

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, to use a screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or to reduce the sound by using a single cylinder fire cut-off to meet the needs of diagnosis. The auscultation site should be kept quiet to minimize human interference.

The brake noise of the right front bush virtual curved wheel is likely to be the wear of the brake pads, the brake pads have become thinner, the brake drum is in direct contact with the vehicle, resulting in abnormal noise, or it is possible that the brake pads are worn unevenly, and the brake pads are raised with foreign objects causing friction and abnormal noise. The abnormal brake noise may not be a component problem of the vehicle itself, or it may be that the braking system has not yet completed the heating up when the cold car starts, and the brakes may produce abnormal noise when the working temperature is not reached; When the stuffy vehicle drives through some sand and gravel areas, the brake pads and brake discs of the vehicle may carry some gravel, and there will be abnormal noises when braking. Brake pads are an important part in the vehicle's braking system, so the brake pads need to be checked frequently by the owner for wear or other abnormalities.

Generally speaking, under normal use, the brake pads generally need to be replaced when they travel to 80,000 kilometers; Of course, you can also decide whether to replace it by observing the thickness of the vehicle's brake pads, which generally need to be replaced if the thickness of the brake pads is less than 5 mm.

First, the vehicle's lower swing arm ball joint or rubber sleeve aging caused by this phenomenon, you need to go to the repair shop to lift the car up, check the lower swing arm ball head and rubber sleeve, if there is an obvious gap, it is necessary to replace the new lower swing arm ball head or lower swing arm assembly! Second, the vehicle's balance bar rubber sleeve or vertical tie rod has a problem caused by this phenomenon, this is the need to check the rubber sleeve and vertical tie rod Third, the vehicle shock absorber oil leakage or shock absorber on the seat top glue has a problem caused by this phenomenon, this is a need to focus on checking the shock absorber and the upper seat top rubber, if there is a problem, you need to replace the new shock absorber or top glue In summary, the reason for the abnormal noise and stuffiness of the vehicle chassis is mostly due to the above aspects, You can take the time to go to the repair shop to do a directional exclusion! [Summary].

The front wheel walks up the key belt book to make abnormal noise, the related reasons are the following points, first, the vehicle's lower swing arm ball head or rubber sleeve aging caused by this phenomenon, you need to go to the repair shop to lift the car up, check the lower swing arm ball head and rubber sleeve, if there is an obvious gap, it is necessary to replace the new swing arm ball head or lower swing arm assembly! Second, the vehicle's balance bar rubber sleeve or vertical tie rod has a problem caused by this phenomenon, this is the need to check the rubber sleeve and vertical tie rod Third, the vehicle shock absorber oil leakage or shock absorber on the top of the seat rubber has a problem caused by this phenomenon, this is the need to focus on checking the shock absorber and the top of the seat rubber, if there is a problem, you need to replace the new reduced macro shock or top glue In summary, the reason for the abnormal noise of the chassis of the car is mostly due to the above aspects, You can take the time to go to the repair shop to do a directional exclusion!

The abnormal sound of the right rear wheel when braking is due to the brake pads, and there are also reasons for uneven brake disc material or large balance error or abnormal wear.

Brake pads are also called brake pads. In the braking system of the car, the brake pad is the most critical safety part, and the brake pad plays a decisive role in the quality of all brake effects, so a good brake pad is the protector of people and cars.

If the car brake pads have abnormal noises, the owner must find out the cause and solve the problem in time, so what happens when the car brake pads have abnormal noise? The main reasons for the abnormal noise of automobile brake pads are the run-in of new cars, serious wear of brake pads, and failure of brake calipers, which should be paid attention to.

Common reasons why car brake pads have abnormal noises:

1. New car running-in: When the new car is just on the road, because the friction surface between the brake pads and the brake disc has not yet been completely matched, each brake is in a process of running in with each other, so that the brake pads will make abnormal noises.

2. Serious wear of brake pads: Alarm devices will be placed inside the brake pads, and when the brake pads of the car wash are worn very seriously, the brake pads will send out a sharp alarm sound, prompting the owner to replace the new brake pads to avoid accidents.

3. Brake caliper failure: When the brake caliper of the car is abnormal, the brake pads will also make abnormal noises, which is generally a relatively muffled sound, and the owner should also pay attention to it.