Brake failure Ask for help, will there be a fault warning if the brake fails

There are 10 major failures.

1. Fault phenomenon: step on the brake pedal, the pedal does not rise, and there is no resistance;

Determine the cause: check whether the brake fluid is missing; Whether there is oil leakage at the brake cylinder, pipeline and joint; whether the parts of the main pump and sub-pump are damaged;

2. Fault phenomenon: the brake pedal is pressed to the end, and the braking effect is not good; Continuous braking, the effect is not improved, and the pedal is gradually raised;

Determine the reason: there is gas mixed in the braking system;

3. Fault phenomenon: continuously step on the brake, the pedal return is raised, and the braking effect is improved;

Determine the reason: the gap between the friction pad and the brake drum is too large;

4. Fault phenomenon: continuously step on the brake, the pedal position rises, and there is a sinking feeling;

Determine the cause: oil leakage;

5. Fault phenomenon: the pedal position is very low; If you step on it again, the position cannot be raised, and it feels hard;

Determine the cause: the main pump is blocked;

6. Fault phenomenon: the pedal height is normal, not soft or sinking, but the braking effect is not good;

Determine the reason: the gap between the friction pad and the brake drum is too large or there is oil stain;

7. Fault phenomenon: brake deviation;

Judgment reason: the car deviates to the left, then the right wheel brake is ineffective, and vice versa;

8. Fault phenomenon: the car travels for a certain mileage, and the brake drum (disc) heats up;

Determine the reason: check the brake master cylinder, brake cylinder or pipeline;

9. Fault phenomenon: the free stroke of the brake pedal is too small;

Judgment reason: needs to be adjusted;

10. Fault phenomenon: the brake fluid level rises slowly;

Judgment reason: Loosen the deflating screw and observe the return of the brake shoe. If the brake shoe returns, the oil pipe should be dredged; If the brake shoe does not return, the brake cylinder should be disassembled and checked.

If the car's brakes fail, it depends on what the fault is, and you can go to a repair shop in a professional shop to check it.

There will be a fault warning if the brake fails. First warning: weak brakes. The most obvious warning before a brake failure is that there is a feeling of powerlessness when braking.

This is clearly the brake pads.

Excessive wear and tear, so we must replace it in time, otherwise the danger may come at any time.

Second warning: brake shaking.

This situation is likely to be caused by the inaccuracy of the appearance of the brake disc, so in this case, it is not recommended to continue driving, and the brake pads should be replaced in time, otherwise it is also very dangerous.

Warning No. 3: The brake bump becomes soft or stiff.

If it suddenly becomes very hard, it is also extremely abnormal, and the brake pump leakage or blockage may cause the brake to become soft or hard, and in this case, it is necessary to go to Xinzhen for maintenance in time.

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.

1.Poor braking (soft braking). When the car brakes, the braking deceleration is small and the braking distance is long.

Usually due to:1. The oil leakage of the auxiliary cylinder or the master cylinder cannot ensure sufficient oil pressure; 2.

brake failure; 3.The air body penetrates into the brake pipe. The reasons for the poor braking efficiency 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 pressing the brake pedal.

When maintaining braking, if the pedal height drops slowly, it means that the brake line is broken somewhere, the seal of the joint is poor, the piston of the master cylinder or slave cylinder is poorly sealed, and the return valve and outlet valve 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 secondary cylinder foc 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.

Second, the brakes suddenly failed. When the car is moving, one or several feet brake continuously, the brake pedal is pressed to the end, and the brake suddenly fails. Reason:

1。Serious oil leakage from the brake master cylinder or sub-cylinder; 2.The piston seals of the brake master cylinder or follower cylinder are damaged, or there is too much air in the brake oil circuit.

If this happens, the driver should brake quickly and continuously with both feet. If the brakes fail, stop and check immediately. First, observe whether there is any loss of brake fluid in the brake fluid box, and then observe whether there is brake fluid leakage in the master cylinder, slave cylinder and oil pipe.

Third, brake mistracking. 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.

Fourth, brake shaking. 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.

Fifth, the brakes creak. It is generally caused by uneven wear of brake discs, brake pads, brake drums and brake shoes.

Sixth, brake no return. When you press the brake pedal, it feels high and stiff or there is no free travel, and the automatic start is difficult or difficult to drive. Symptoms:

When the brake pedal is pressed, the pedal does not rise and there is no resistance. It is necessary to determine whether the brake fluid is missing; whether there is oil leakage from brake cylinders, pipes and joints; Whether the parts of the master cylinder and slave cylinder are damaged.

Brake system troubleshooting method:

1. Fault phenomenon, step on the brake pedal, the pedal does not rise, there is no resistance, judge the cause, check whether the brake fluid is missing, the brake cylinder, pipeline and joint are in a state of closed oil leakage, and whether the parts of the main pump and cylinder are damaged;

2. The brake pedal is pressed to the end, the braking effect is not good, the continuous braking, the effect is not improved, and the pedal gradually increases, judge the reason, the braking system is mixed with gas;

3. If the handbrake is not put or not put in place, check whether there is a lack of brake oil, and add some brake oil.

The handling method of the brake system alarm fault is as follows:

1. Lack of brake fluid, when the driver steps on the brake dismantling pedal, the force of stepping down from the pedal is transmitted by the piston of the brake master cylinder through the brake rock section fluid to the brake cylinder located at the wheel, so that the brake pad is in contact with the wheel, so as to achieve the purpose of preventing the vehicle from advancing; Just add brake fluid;

2. The brake oil pot is damaged, the brake fluid cup is divided into the upper line and the lower line, when the brake fluid inside is lower than the lower line, this phenomenon will be sensed through the sensor next to the oil cup, and reflected by the brake light on the instrument thick Yuyu plate. If the brake fluid decreases quickly, it means that there is a leak in the braking system; Replace the brake oil can;

3. The brake pads are seriously worn, and the lights will always be on, so the brake pads need to be replaced.

The failure of the automobile brake balance may be the lack of necessary maintenance of the automobile brake system, resulting in too many impurities in the brake master cylinder of the car, poor sealing, failure of the vacuum booster pump, and dirty brake oil, etc., which need to be further tested and repaired. Extended content: 1. The working principle of the brake is to convert the kinetic energy of the car into frictional heat energy and consume it, when braking, the car brake pedal is the brake lever linkage pressure, the brake pad transmitted to the brake drum is jammed with the brake, and the wheel disc makes the car slow down or stop running.

2. The car brake can make the car brake and make the car stop. There are two kinds of common braking devices in automobiles, drum brakes and disc brakes, the manufacturing cost of drum brakes is relatively low, the installation is convenient, and the heat dissipation performance of disc brakes is relatively good, and it is not easy to cause brake failure.

The handling method of the brake system alarm fault is:

1. Lack of brake fluid, when the driver steps on the brake pedal, the force of stepping down from the pedal is transmitted by the piston of the brake master cylinder to the brake fluid to the brake cylinder located in the wheel, so that the brake pad is in contact with the wheel, so as to achieve the purpose of preventing the vehicle from moving forward; Just add brake fluid;

2. The brake oil pot is damaged, the brake fluid cup is divided into the upper line and the lower line, when the brake fluid of the inner staring beam is lower than the lower line, this phenomenon will be sensed by the sensor next to the oil cup, and reflected by the brake light on the dashboard. If the brake fluid decreases quickly, it means that there is a leak in the braking system; Replace the brake oil can;

3. The brake pads are seriously worn, and the lights will always be on, so the brake pads need to be replaced.

1. Improper operation.

Due to the improper operation of the brakes in daily driving, the failure of the parts, such as a long time downhill, the brake pads will be heated by friction, the brake hub will be carbonized, and the brake function will be completely invalid.

2. Lack of maintenance.

In daily maintenance, the lack of necessary maintenance of the brake system, too many impurities in the brake master cylinder, poor sealing, failure of the vacuum booster pump, excessive dirt of the brake fluid or the mixing of several brake fluids after heating, oil leakage of the brake master cylinder or sub-cylinder, air leakage of the air tank or pipeline interface and other problems will lead to brake failure.

3. Serious overload.

Due to the serious overload of the car when driving, under the action of gravitational acceleration, the inertia of the vehicle movement is increased, which directly leads to brake failure.

Brake failure is a serious fault in the driving of the car, and when the following phenomenon occurs, it may be a brake failure. When the car is moving, one or several consecutive feet brake, the brake pedal is stepped to the end, and the brake suddenly fails. What should I do if I encounter such failures?

Fault Cause

1.There is no brake fluid in the master cylinder.

2.The main pump bowl is broken or overturned.

3.The sub-pump bowl is broken or overturned.

4.Brake lines are badly ruptured or joints are disjointed.

Fault diagnosis

The reasons for the poor braking efficiency of the hydraulic braking system can generally be judged according to the brake pedal stroke (commonly known as high and low), the soft and hard feeling when the brake pedal is pressed, the stability after stepping the brake pedal, and the pedal height increase when braking.

1.Generally, the pedal height is too low when braking, and the braking efficiency is poor. If two or more feet brake continuously, the pedal height will increase and the braking efficiency will improve, indicating that the gap between the brake drum and the friction pad or the master cylinder piston and the push rod is too large.

2.When maintaining braking, if the height of the pedal decreases slowly or rapidly, it means that the brake line is cracked somewhere, the joint is poorly sealed or the sub-pump bowl is poorly sealed, the return spring is too soft or broken, or the master cylinder bowl and ring are poorly sealed, and the oil return valve and oil outlet valve are poor. You can first step on the brake pedal to observe whether there is any brake fluid leakage.

If the exterior is normal, the sub-pump or master pump should be checked for failure.

3.When braking several feet in a row, the pedal height is still too low, and after the second foot brake, I feel that the master cylinder piston is not returned, and when I step on the brake pedal, there is a sound of the master cylinder push rod and the piston colliding, which is the main cylinder leather bowl is broken or the return spring is too soft.

4.When braking several feet in a row, the pedal height increases slightly, and there is a spring**, indicating that air has seeped into the brake line.

5.After several consecutive feet, the pedal was stepped to the bottom, and the pedal was felt to have no reaction, indicating that the brake fluid in the reservoir of the master cylinder was seriously lost.

6.When braking several feet in a row, the pedal height is low and soft, which is the plug vent of the reservoir in the total oil inlet hole.

7.When braking on one or both feet, the pedal height is appropriate, but if it is too hard, the braking efficiency is not good. It should be checked whether the gap between the friction plate of each wheel and the drum is too small.

If the gap is normal, check the surface condition of the drum wall and friction plate. If it is normal, check whether the brake shoe spring is too hard, whether the main cylinder or sub-pump leather bowl is swollen, and whether the piston and cylinder wall are loose. If it is normal, you should further check whether the brake hose is aging and unblocked.