What is the rattling sound when going uphill, like a brake hitting a brake disc?

When the clutch release bearing is damaged, the clutch plate cannot be completely disengaged, which eventually leads to an abnormal sound during acceleration.

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.

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, 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.

Hello, it may be that the shock absorber is abnormal.

The reason for the sudden braking to the bottom is that the ABS anti-lock braking system is activatedWhen the ABS system is started, in addition to the rattling sound, the brake pedal will also bounce its feet, and in the braking stage, the brake pedal will drop a little or slowly down.

2. It may be the abnormal noise caused by brake pads and brake discs, and the common reason is excessive wear.

3. Foreign objects on brake pads and brake discs may also cause abnormal noise.

4. If it is caused by excessive wear, you can directly replace the brake pads or brake discs.

5. If you can't find the problem, it is recommended to go to a 4S shop or a professional auto repair shop to check first, determine where the problem is, and repair the symptoms.

ABS anti-lock braking system

Antilock brake system (ABS) is abbreviated as ABS. The function is to automatically control the braking force of the brake when the car is braking, so that the wheels are not locked and are in a state of rolling and slipping (the slip rate is about 20%), so as to ensure that the adhesion between the wheels and the ground is at the maximum.

The development of the ABS system dates back to the early 20th century. In the late 70s of the 20th century, the rapid development of digital electronic technology and large-scale integrated circuits laid a technical foundation for the practical development of ABS system, and many companies have developed various forms of ABS system. Since the mid-80s of the 20th century, the ABS system has developed in the direction of high cost performance.

Some companies have simplified the structure and optimized the system of ABS, and launched an economical ABS device; Some companies have introduced rear-wheel ABS or four-wheel ABS systems for light trucks and passenger and cargo vehicles. These efforts have created the conditions for the rapid popularization of ABS. The ABS system is considered to be the most important technical achievement in terms of safety since the introduction of seat belts in automobiles.

Quality problems with brake pads.

The brake cylinder does not return, it is mostly a problem with the brake duct, the rust in the brake duct or the dirty lubricating oil will lead to poor return, clean the brake duct, polish it with fine sandpaper and apply new lubricating oil. It is also possible that there is a problem with the brake cylinder, and the brake cylinder needs to be replaced, but this kind of failure is relatively rare.

Brake guide caliper fit problems. In addition to the brake guide being stuck because of dirty, it is also possible that the gap between the brake guide and the brake caliper is too large, and there is an amount of space between the two resulting in abnormal noise, replace the new brake guide or brake caliper (generally replace the brake caliper, because the aperture of the brake caliper may become larger due to wear, and the wear of the brake hose is relatively small), or wrap a layer of waterproof tape on the brake hose to reduce the fitting gap.

Precautions for low-speed driving.

When driving at low speed, try to turn off the air conditioner, and do not make the engine run at a higher speed in order to improve the efficiency of the car air conditioner when encountering traffic jams, which will shorten the service life of the engine and the air conditioning compressor.

The car air conditioner switch program should be kept in mind: when turning on, turn on the fan switch first, and then turn on the compressor switch (a c), when turning off, turn off the compressor switch (a c), and then turn off the fan switch. It is best to turn off the compressor switch off at high temperatures, and then turn off the fan for two or three minutes, which will allow the air conditioner compressor to dissipate heat better.

The above content refers to People's Daily Online-The real cause of abnormal noise of cars: 6 ways to easily get it.

The reason for the sudden braking sound of the car is the sound made when the ABS anti-lock braking system is working.

Causes of chassis rattling when applying brakes:

1. The material of the brake pad.

2. The brake disc is uneven.

3. The edge of the brake disc is raised due to natural wear. What is the specific reason, it is best to go to 4S to check to know.

The effects of sudden braking of a car are:1. Increase consumption;

2. Affect the service life of tires and increase wear;

3. Reduce the service life of the engine;

4. Reduce the service life of the clutch system;

5. Reduce the service life of brake pads and brake discs;

6. Accelerate the aging of the brake cylinder and the brake master cylinder.

Abnormal noise when stepping on the brakes may be due to the normal operation of ABS, safety reminders, loose chassis parts, and unstable brake discs.

The details are as follows:

1. The working process of ABS is actually a cyclic working process of locking, loosening, locking and loosening, so that the vehicle is always in a critical locking gap rolling state. Then when you slam on the brake sharply to trigger the ABS to work, it will make a clanging sound, which is a normal phenomenon.

2. If you press the brake pedal and hear the rattle between the gearbox and the gear, the main reason for the sound may be the electronic linkage between the braking system and the automatic transmission. When the brakes are applied, the transmission solenoid valve opens with a clanging sound. At this time, press the lock button of the stop to enter the gear, which is a safety reminder.

3. If the brake will also produce a clanging sound, or the vehicle does not have an automatic lock button, or the sound is continuous or uninterrupted, then you should pay attention to it, it is likely to be caused by the failure of the brake system or the failure of the chassis connection parts.

4. The brake disc is uneven, the brake disc may be uneven during use, and when the brake disc is uneven, it is easier to step on the brake to make abnormal sound.

Summary. Hello, I'm helping you sort out the answer to your question, please wait a while What is the reason for the rattling of the chassis in front of the brake?

Hello, I'm helping you sort out the answer to your question, please wait a while Oh Stop by stepping on it, squeak, as if under the chassis.

In this case. As soon as you step on the brakes or when you go high, first check whether the brake pads are normal. If the brake pads are normal, then the chain rock needs to check whether there is a problem with the ball head of the chassis and whether the ball head is loose.

Take a look at the brake pads and brake discs to see if there is any problem.

This can be caused by excessive aging of the suspension bushing, damage to the front shock absorber flat bearing, or excessive clearance between the brake pads and the brake caliper. When this happens, be sure to go to a professional facility to check the chassis' bushings, flat bearings, and the gap between the brake pads and brake calipers. There are a number of control arms on the suspension of the car, all of which have bushings.

1.Material issues with brake pads. Most of the brake pads used today are semi-metallic brake pads.

If the metal in the brake pads is too hard, it will make noise when braking. In this case, the brake pads can be removed and replaced, and a product with a very high coefficient of friction can be selected. 2.

The brake pads are uneven. During use, the brake pads may create scratches in the middle of the brake disc. When the brake pads are uneven, it is very easy to make noise when braking, especially when replacing the so-called "original brake pads", the brake disc will definitely bulge in the middle, and it will shake up and down to produce an impact sound when braking.

In this case, the brake pads can be removed or smoothed. 3.The edge of the brake blade is protruding due to natural wear.

When we replace the brake pads with new ones, the brake pads and brake pads do not fit perfectly into the brakes and make noise. In this case, when replacing the brake pads with new ones, the brake pads can be chamfered or replaced. Millions of car purchase subsidies.