What are the most common failures of car brakes? How can these failures be resolved?

1. There is an abnormal sound on the brakes.

1. Abnormal brake noise of new cars. The brake pads and brake discs of the new car are all new, and they are still in the run-in period, at this time there will be a slight sound, which is a normal phenomenon, and the sound will disappear after the car has been driven for a long time.

2. There is an abnormal sound on rainy days. In rainy days or when there is water in the brake disc, the brake pads and brake discs are relatively wet, and the brakes are prone to a whining sound of vibration at low speeds, and the water will be fine after drying.

3. There is an abnormal sound between the brake pad and the brake disc. For example, small particles such as sand and small stones enter between the discs, which will cause a slight sound. Removing the foreign matter inside in time is sufficient.

4. Friction between the brake pad and the edge of the groove. After a long time of friction, the brake disc will have a certain degree of groove, and the brake pad will make an abnormal noise when it rubs against the edge of the groove. When the wear of the brake disc is large, it is necessary to replace the brake disc in time.

Second, the brakes become harder.

The vacuum booster relies on the negative pressure in the engine intake pipe to extract the negative pressure in the vacuum booster pump, but the negative pressure extracted in a few seconds is enough for you to brake about 3 times or more. For example, if you stop on the spot and idle, and step on it loosely continuously, your feet will gradually become harder! As long as you're driving, because you've been vacuuming, there's no low rpm brakes that will get stiffer.

High-speed traffic jams can also ensure that there are no problems. If you still feel that the brakes are hard after many attempts, you need to go to the repair point in time to check.

3. The brakes become loose.

The first thing we have to check is whether the brake pads have been worn to the limit, because the brake pads are wearing parts, which will wear out thinner and thinner with the increase of kilometers, and when they are worn to the limit value, its braking effect will decrease. If the brake master cylinder or sub-cylinder is damaged, or if there is a slight oil leakage, it will also cause the brakes to become softer and the braking distance to become longer. We also need to pay extra attention to the brake discs and whether the tires are badly worn and whether the tire pressure is normal.

Fourth, the body trembles when the brakes are applied.

If the deformation of the brake disc is slight, the boring disc can solve the problem, and the serious deformation must be replaced with a new brake disc and brake pads, and the left brake disc is replaced because of serious deformation. When the owner brakes frequently and suddenly, the problem of brake discs and brake pads rises too quickly, and it will be deformed when it is suddenly cold, and after deformation, there will be the problem of stepping on the brakes and shaking, the brake pedal is shaking, and the steering wheel is also shaking.

The brake system fails, the pressure is not enough, it becomes very soft, it cannot brake, the car cannot stop quickly, and the brake belt should be replaced and the braking system adjusted can solve these faults.

The most prone fault is that the brake can not be braked or is too sensitive, when braking, it is easy to cause the front seat and the back seat of the person to lean forward, go to the repair shop to adjust the brake pads, not too tight, not too loose.

For example, if the brake fails, the brake wear is particularly serious, and the brake pedal has no effect, so you must replace the brake pads with new ones in time.

Many brakes are emergency brakes as a last resort, so you must pay attention to the braking skills. There are two situations discussed here, one is the vehicle without the ABS anti-lock braking system, and the old vehicles are basically like this. Xiangshu this kind of vehicle in the encounter with emergency braking, if the braking force is too large, it may make the car tires lock (the tires do not rotate at all), we can often see two long black brake marks on the road, this is the car without ABS when the tire and the ground friction traces, the tire due to emergency braking causes the tire to lock up and no longer rotate, but the huge inertia will make the car's tire rub against the ground and continue to slide forward, The violent friction between the tire and the ground caused a black mark on the rubber particles that had been rubbed off on the tire.

At this time, if you force the direction, it will often have serious consequences such as deviation, side slippage, tail flicking, or even rollover out of control.

The braking system is generally composed of two main parts: the brake control mechanism and the brake. The brake control mechanism produces the braking action, controls the braking effect, and transmits the braking energy to the various parts of the braking system, and the brake is the part that generates the force that hinders the movement or movement trend of the vehicle.

1. The brake pads are seriously worn, the brake pads are divided into two kinds of induction wires and without induction line, and the induction line will automatically turn on the circuit when the brake pads are worn to the limit position, and the fault light will be lit at this time. Brake pads need to be replaced;

2. The brake fluid level is too low, and the lack of brake fluid will be accompanied by an obvious lack of braking force, and even the loss of braking force will occur in serious cases. In this case, the warning light will turn on. As long as the brake fluid is replenished in time;

3. Oil leakage and false alarm of the brake system. It directly affects the technical performance of the car, resulting in the waste of lubricating oil and fuel, consuming power, affecting the cleanliness of the car, and causing environmental pollution. The fault light will be lit and the gasket or oil seal needs to be replaced.

If the braking system fails, it will affect the driving safety, and it is necessary to check and repair it in time. The braking system of the automobile is composed of a vacuum booster pump, a brake master cylinder, a brake cylinder, a brake pad, and a brake vertical disc. In order to ensure the safe driving of automobiles, increase the average driving speed of automobiles, and improve transportation productivity, special braking mechanisms are provided on various automobiles, and such a series of specialized devices are called braking systems.

The main function of the braking system is to slow down or even stop the moving car, to stabilize the speed of the car driving downhill, and to keep the stopped car still.

There are many reasons why this braking system fails, such as:

1) Insufficient brake oil pressure. (lack of oil in the brake master cylinder, rupture of the brake line, leakage of the oil pipe joint, and blockage of the oil circuit).

2) There is air in the braking system.

3) Manufacture and sale of free stroke of the carrying pedal or too large brake clearance, poor contact of the brake shoe friction pad, serious wear or oil stains.

4) The brake master cylinder, wheel cylinder piston back erection and cylinder tube are worn or strained, and the leather bowl is aged and damaged.

The brake is a very important part of the car, controlling the speed of the car and whether it is moving or stopping. If there is a problem with the brakes of the car, it is a very terrible thing and can lead to serious consequences. Therefore, before every drive, checking the brakes is a very necessary thing to say.

So, what happens when checking the brakes to indicate that there is a problem with the brakes of the car? <>

First of all, if you feel weak when you step on the brakes, then there must be some problems in this situation, and the most likely situation is that the brake pads are very badly damaged, and the service life has been reached. It may also be due to insufficient brake fluid, or some water mixed in the brake fluid or air in the brake pipeline, etc., which may lead to a feeling of softness and weakness during braking. At this time, car owners must check the symptoms one by one, and only drive after ensuring that the brakes are correct.

The second situation is that there is an abnormal sound when the brakes are applied, and many car owners may not pay much attention to the sound when they step on the brakes, thinking that this may be a very normal phenomenon. However, the abnormal sound of stepping on the brakes may be caused by the very serious wear of the brake disc and brake pads, or it may be due to the poor quality of the brake pads. At this time, you must not be careless, you must go to the car's maintenance key shop for a comprehensive and systematic inspection, so that the brake system can be prevented only after all the mistakes have been made.

Finally, when the brakes are stepped on, the body of the car will be accompanied by shaking or deviation, which is often caused by the deformation of the brake disc or too much wear, and it is generally recommended to replace the brake disc. If the car deviates when the brakes are pressed, it may be because different specifications or different brands of brake discs are used on both sides of the wheel, resulting in different friction effects, and it may be because of oil leakage from the cylinder of one side of the brake. In this case, if you can't determine or solve it, you have to go to the 4S shop to ask a professional maintenance personnel to overhaul it.

The first point is that if there is a seepage of the sound of repentance, the bureau will say that Cong Zhengming has a problem with the brakes, the second point of the brakes, the value is not good, there may be a problem at this time, and the third point If there is, the phenomenon of jamming may also be a problem with the brakes.

There is a shaking phenomenon when the brake is pressed, the brake becomes soft, the feedback strength of the brake pedal is not clear, the position of the brake pedal changes, and there is an abnormal sound when braking.

If the car is not sensitive when stepping on the brakes or when stepping on the brakes makes a peculiar sound, it means that Tongwei has a certain stupid problem when the car rolls on, and we need to go to the repair shop immediately for repair.

Brake failure: Continuously press the brake pedal, and the vehicle brakes poorly. 1. Press the brake pedal, if the pedal does not rise and there is no resistance, you should check whether the brake fluid is missing, whether the brake cylinder, pipeline and joint are leaking, and whether the components of the main cylinder and sub-cylinder are damaged.

2.If the brake pedal is pressed to the end, the braking effect is not good, and there is no improvement when pressed continuously, and the pedal is gradually raised, it can be judged that the braking system is mixed with gas. 3.

If the pedal returns to its original position and the effect improves after continuous pedaling, the gap between the friction pads and the brake drum is too large and should be adjusted. 4.If you press the throttle continuously, the position will rise, it will feel sinking, and there will be oil leakage.

5.When you press the pedal, the position is low. If you step on the cover again, the position cannot be lifted, and it feels stiff, then the master pump will be blocked.

6.The pedal height is normal, not soft or sinking, but poor braking refers to the excessive gap between the friction pads and the brake drum or oil stains.

Common faults in the automotive braking system include: poor braking effect (soft braking), sudden brake failure, brake mistracking, brake shaking, brake squeak, brake failure, etc. 1.

Poor braking effect (soft braking) When the car brakes, the braking deceleration is small and the braking distance is long. It is usually due to: oil leakage in the auxiliary cylinder or master cylinder, which cannot ensure sufficient oil pressure; Brake failure.

Common faults in the automotive braking system include: poor braking effect (soft braking), sudden brake failure, brake mistracking, brake shaking, brake squeak, brake failure, etc.

1.Poor braking effect (soft braking).

When the car brakes, the braking deceleration is small and the braking distance is long. It is usually due to: oil leakage in the auxiliary cylinder or master cylinder, which cannot ensure sufficient oil pressure; Brake failure. The air body penetrates into the brake pipe.

The reasons for the poor braking effect of the hydraulic braking system can generally be judged by the stroke of the brake pedal, the soft and hard feeling when the brake pedal is pressed, and the stability after the brake pedal is pressed. When maintaining braking, if the pedal height drops slowly, it means that the brake line is broken somewhere, the joint is poorly sealed, the master cylinder or slave cylinder piston is poorly sealed, and the return and outlet valves are poor. First, press the brake pedal and observe if there is any brake fluid leakage.

If the appearance is normal, check for the fault of the sub cylinder or master cylinder. When braking a few feet in a row, the pedal height increases slightly, and there is a spring**, indicating that the air body has infiltrated the brake line.

2.Braking deviation.

When braking, the direction is off, especially in cars without ABS anti-lock braking device, the direction cannot be controlled. The reason is that the brakes are worn unevenly, the piston oil seal of the master cylinder is inflated, and oil leaks from the cylinder.

3.Brake judder.

When braking, it glows and the steering wheel jumps. The reason is that the swing of the brake disc exceeds the limit, the brake caliper is deformed, and the brake pads are ground into a tapered shape. This situation must be fixed at the factory.

What is the performance of a broken car brake master cylinder.

The fault of the brake master cylinder is manifested as: oil leakage at the connection between the brake master cylinder and the vacuum booster or the limit screw; After the brake pedal is pressed all the way, the brake still fails or fails; Pressing the brake pedal feels soft; brake failure after braking; Sudden failure of the brakes; And the filial brake pedal does not return or returns slowly.

The main function of the brake master cylinder is to provide brake assistance, which is only possible after the vehicle engine has been started. The main oil brake master cylinder is a true air auxiliary pump. With the help of the master cylinder, it is so easy for the driver to press the brake pedal.

If the car doesn't start the engine, it's hard for the driver to step on it after a few steps. Therefore, once the brake pump fails, it will affect the normal braking function.

Brake master cylinders are divided into pneumatic brake master cylinders and hydraulic brake master cylinders. Pneumatic brake master cylinders are mainly used in trucks (such as heavy trucks, large buses, construction vehicles) and some agricultural vehicles. Hydraulic brake master cylinders are mainly used in small cars (such as cars, vans, minivans and minibuses) and some agricultural vehicles.

The main brake cylinder is the main control device in the automobile service braking system, which realizes the sensitive follow-up control of the braking process and release process of the dual-circuit main braking system. What are the common faults of the car brake system What are the manifestations of a broken car brake master cylinder @2019