Why is the ABS light on?

ABS anti-lock braking system is mainly composed of wheel speed sensor, electronic control unit, ABS control valve, ABS fault indicator, hydraulic control pipeline, etc., when the ABS light is on, it may be caused by the following reasons.

1. The wheel speed sensor is faulty.

Because the wheel speed sensor is installed on the wheel, it is easily affected by road conditions, once it is hit by a bullet or covered with sediment pollution, it may affect the transmission of data, when the electronic control unit of ABS cannot recognize the wheel speed signal, the ECU will feedback the fault information on the instrument panel through the way the ABS light lights up or flashes to remind the driver.

2. Poor contact or fault of the connecting line.

This kind of fault is now relatively common, if the terminal is in poor contact with the system can not receive the electronic signal resulting in the ABS light on, so we should focus on the connection of the terminal of the relevant circuit. If conditions permit, you can check the fuse box of the vehicle to see if the relevant fuse is blown or damaged;

3. Failure of electronic control unit.

The electronic control unit of the ABS anti-lock braking system is the most sophisticated component of the entire anti-lock braking system, if the circuit board is burned out or the data transmission is blocked, it will cause the whole system to be paralyzed and then the ABS light will be on. At this point, it is likely that the entire ECU may need to be replaced, and the repair can only be done for a simple firmware loss.

Automobile anti-lock braking system is ABS, the device is when the car brakes in the situation, according to the speed of the wheels, automatically adjust the pressure in the brake tube, so that the wheels are always in a slip state of rolling while locking, especially emergency braking, it will brake intermittently, that is, braking - release - braking, in order to avoid danger. [1] Anti-lock braking device, with a frequency of 6 10 times per second for braking-release-braking pulse braking, with electronic intelligent control mode instead of manual mode, to prevent wheel locking, so that the wheels always get the maximum braking force, and keep the steering flexible. When the wheels are to be locked, the braking force is reduced, and when the wheels are not locked, the braking force is increased, and so on repeatedly to make the braking effect the best.

First of all, I want to ask, whether you stepped on the emergency brake, or emergency braking, if this is the case, the ABS fault light is on, then this situation is normal, if it is not the situation I said the light is on, then it is recommended that you go to the repair shop as soon as possible to overhaul!

If it is not normal, the reasons and solutions for stepping on the brakes ABS light are as follows

1. The ABS light is always on, indicating the alarm of the anti-lock braking system. Under normal circumstances, the light will turn on when the ignition switch is turned on or the engine is started, and the system enters the automatic detection program, and after the detection is completed, the light is turned off. If the light does not turn on after turning on the ignition switch, or does not go off after it is on, or lights up while driving, it indicates that the system is faulty.

2. There are two possibilities, if only the ABS warning light is on while driving, it means that there is a fault in the ABS system, but the car is still reliable in the conventional braking system, and the professional should be asked to repair it with a diagnostic instrument as soon as possible, judging that it is a problem such as gear ring, sensor, and line; If the ABS warning light and the braking system warning light are lit at the same time while driving, it means that both the ABS and the braking system are faulty, and the braking characteristics will change.

If the latter is the case, you must immediately stop driving and check the brake fluid level. If the liquid level is normal, it indicates that the ABS system may fail, that is, the adjustment function of the ABS system fails, and only the ordinary braking system plays a role, which is easy to cause the rear wheels to lock up quickly when braking, resulting in side skidding. At this time, you should drive with caution and carry out repairs as soon as possible.

Precautions for driving:

1. Fasten your seatbelt. The first thing to do when you get in the car is to fasten your seatbelt, and don't forget to remind your family or friends to wear one.

2. Check the condition of the car regularly. In a timely manner, the vehicle has been regularly maintained, and it is necessary to check the condition of the vehicle frequently, see whether the parts, tires, lights, oil, etc. are running well, and repair the problems in time.

3. It is strictly forbidden to run red lights. I believe everyone knows this, now that the traffic laws are strict, the punishment for running a red light has been increased, and very few people run a red light, but you must know that the purpose of doing so is nothing more than to ensure safety.

4. Don't overtake casually. Don't try to overtake to save a little time, especially if you're following behind a big car and obstructing the view ahead, as overtaking is most dangerous because you can't be sure if there's a car coming from the opposite side.

There are several reasons why the ABS+ handbrake light is on:

1. The wheel speed sensor is dirty, or the error is out of tolerance;

2. The brake pads are worn to the limit;

3. Lack of brake fluid;

4. The power generation of the generator is too high or too low;

5. ABS failure.

The easiest way to determine is to test it through a special computer. If you don't have a dedicated computer, it's more troublesome. First eliminate the doubt, and then eliminate the 4th doubt, if there is a phenomenon of light at the same time, it is necessary to support the car, clean the wheel speed sensor of the 4 wheels, and then measure its value with a multimeter.

Extended information: ABS was invented to avoid the above-mentioned phenomenon of emergency brake slippage. Vehicles equipped with the ABS system use wheel sensors to monitor whether the wheels are locked.

When the wheels are locked, the ABS system will intervene under the braking system to release the pressure of the brakes, let the locked wheels brake go, let the wheels roll again, let the vehicle regain the ability to handle, and then restore the pressure of the brakes, so that the vehicle continues to slow down.

In this way, with the concept of time-sharing, the braking system of the vehicle is constantly braked-released-braked-released, so that the vehicle can maintain the ability to control between the braking intermittents, so that the vehicle can avoid obstacles and avoid accidents.

The modern ABS system can perform several to more than a dozen of the above movements within 1 second, so that the slippage of the vehicle is minimized, so as to maintain the good braking effect while maintaining the vehicle's handling and dodging ability.

In the event of an emergency braking, the driver only needs to press the pedal at the fastest speed, and ABS will intervene in the operation of the brake in a timely manner. When the ABS system is actuated, the brake pedal will be repulsed due to the repeated release of pressure in the braking system.

If it is just powered on, it means that the system is self-testing, which is normal.

If it is always on during driving, it means that the ABS is faulty and should be repaired as soon as possible.

See if the brake fluid level is low.

The working process of ABS is actually a lock-release-lock-release cycle working process, so that the vehicle is always in a critical locking state of rolling. Then when you urgently press the brakes to make the ABS work, there will be a popping sound, which is normal. At this time, you can press the brake hard to the end.

Causes of the thumping sound when the brakes are applied:1. Brake discs and brake pads are overwhelmed and are basically highly consumable products.

Every time you brake, the two parts basically have to rub, which will naturally cause wear and tear in the long run. It will naturally make noise when it is worn out, so it is natural to maintain and replace it regularly. Under normal circumstances, the replacement cycle of braking the vertical car pad is 6-80,000 kilometers, and the brake disc is 10-120,000 kilometers; 2.

There is a problem with the installation and configuration of the brake pads. If the brake pads are installed in reverse or the model is incorrect, there may also be noise. You can reinstall the brake pads.

If the brake pads are mainly installed on the car, then you have to go to a professional auto repair shop to do business, especially the owners of roadside stalls who have replaced the brake pads, and pay more attention to this. 3.Other possible causes.

Most faulty calipers, brake discs and brake pads can essentially cause this noise. If the sound is continuous, the first task is to detect if there is a drag brake. Poor caliper reset will affect the friction between the disc and the film for a long time, and there will be sound in certain situations.

In addition, if there are foreign objects on the brake pads and brake discs, it may also affect the noise.

1. Abnormal brake noise, the more common brake system is abnormal brake noise, which many car owners have encountered. Generally, the abnormal brake sound is when the vehicle is driving and the brake system will emit a sharp metal friction sound, which often appears after rain;

2. If this situation occurs, it is mostly because the brake pads are thinned, and the back plate grinds the brake disc, the brake pads are hard, and there are foreign objects in the brake pads, which will lead to abnormal noise, so when there is abnormal brake noise, the thickness should be checked first, and the thickness is not problematic, and stepping on the brake a few times may alleviate the problem of abnormal noise;

3. When braking, the "eccentric braking" braking deviation is also the brake deviation, and the brake deviation phenomenon is that the steering wheel has obvious deviation to one side when the owner steps on the brakes, that is to say, the braking force is large on the one hand, and the braking force is small on the other.

The reasons why the ABS light is on are as follows:

1. Basically, it can be determined that it is a brake pad! The sound of the card rubbing against the brake disc! And the brake pads should be replaced!

ABS is a function to detect the operation of brake pads! There is also a situation that will cause the ABS light to turn on! It is the brake pad where there is too much ash of an ABS sensor, which affects the misjudgment of the sensor, thus causing the fault light to be on;

2. It is particularly harsh when you lightly step on the brakes! But step on it heavier and there will be no sound! As long as you step lightly, there is no deep stepping;

3. Then you can be sure that it is the brake pad. The sound of the card and the brake disc rubbing! You can take out the cards and try it! Short distances. Don't be too long. Don't brake suddenly, either. It is still necessary to install it after checking that there is a problem.

When stepping on the brakes, there is a rattling sound is not ABS broken, the reason for the abnormal noise: 1. There will be a run-in period for a new car or a brake disc that has just been replaced, and there will inevitably be some abnormal noises during the run-in period, which will be eliminated after running hundreds of kilometers. The brake pedal will be continuous when braking suddenly"Wow"sound, sometimes there is the phenomenon of springing feet, which means that the ABS system starts, is a normal sound, at this time the strong brake can be stepped on to the end, but only for vehicles equipped with ABS system; 2. If it is screaming, the first thing to check is to despise the brake pads that are running out (the alarm pads sound).

If it is a new film, then check whether there is any foreign object caught between the brake disc and the plate. If it is muffled, it is mostly a problem with the brake caliper, such as the wear of the movable pin, the fall off of the spring blade, etc.; 3. If it is called, then there are more problems, such as calipers, brake discs, and brake pads. 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.

The ABS light is always on, it may be a line fault. This is also a common problem. Although each car has an ABS system, due to the different process assembly quality and materials, in fact, there are many loose faults of the wheel speed sensor insert, which can be focused on checking.

Troubleshooting is a very troublesome thing, and you need to be patient when dealing with it. It is best to check each plug, including the contact of the relevant fuse and the knock of the ground wire. When you hit the brakes, the ABS light comes on.

Reason: The light stays on to indicate that the anti-lock braking system alarms. Under normal circumstances, when the ignition is turned on or the engine starts, the light will turn on and the system will enter the automatic inspection procedure.

When the check is complete, the lights will turn off. If the light does not turn on after the ignition switch is turned on, or the light does not go out after turning on, or the light is on while driving, it means that the system is faulty; 2.There are two possibilities.

If only the ABS warning light is lit while driving, it means that the ABS system is in a fault, but the car is still reliably braking by the conventional braking system, and a professional should be asked to check it with a diagnostic instrument as soon as possible to determine that it is a problem such as gear ring, sensor, wiring, etc.; If the ABS warning light and the braking system warning light are lit at the same time during driving, it means that both the ABS and the braking system are faulty, and the braking characteristics will change; 3.If the latter is the case, it must be stopped immediately to check the level of the dynamic fluid. If the liquid level is normal, it means that the ABS system may be faulty, that is, the adjustment function of the ABS system fails, and only the ordinary braking system works, which is easy to affect the rapid locking of the rear wheels during braking, thus affecting the side skidding.

At this point, you should drive carefully and get repairs as soon as possible.