After bleeding the brakes, the abs light came on. Self-bleeding the brakes on a car with ABS: step by step instructions

Bleeding ABS brakes is a very difficult process, requiring motorists to have a set of certain technical skills. Previously, before the advent of cars with such a system, this issue was not so serious, so doing it at home took no more than an hour and a half. But with the development of technology, the problem arose of how to bleed the brakes with ABS.

The anti-lock system (ABS) prevents the wheels from locking when hard braking while providing protection against loss of vehicle control. Its main task is to regulate the speed of rotation of all wheels. This is achieved by changing the pressure in the vehicle system, namely with the help of impulses that are fed to the system control unit.

The principle of operation is based on the elementary laws of physics, more precisely on the force of friction. It is clear that the wheel contact is relatively pavement is stationary, and since the static friction force is greater than the sliding friction force, the anti-lock braking system maximally equates the speed of the wheels with the machine itself when braking.

The elements of the system include control valves that are located in the line of the main brake system, they receive impulses and regulate pressure. Further, sensors located on the wheel hubs, which measure the speed of movement, transmit this information to the main node. And finally the electronic unit control, which makes decisions about the force of pressure in the brakes.

Bleeding instructions

In order to bleed the ABS of the first type, you must perform the following steps. First, conduct a visual inspection of the main unit of the system. Secondly, turn off completely by removing the fuse. Thirdly, unscrew the fitting and the pumping RTC and proceed directly to pumping. Do not forget that the whole process should take place with the pedal depressed, if you do everything correctly, then the malfunction indicator will light up when ignited anti-lock braking system. Next, you need to turn on the pump and wait until all the air has left the system. The system will be primed correctly if the light goes out.

The second type of ABS is pumped in a different way, a little more complicated. First you need to find a person who will help, because since such a system has all the elements in different places, it will be impossible to do it alone. The very first thing to do is to relieve pressure, as it can reach 180 or more atmospheres. It is recommended to do this by turning off the ignition and pressing the brakes about 10-20 times. You should also disconnect the connectors on the brake fluid reservoir. Pumping is carried out first on the front wheels, and then on each rear wheel separately, first on the right, and then on the left.

Let's start with the front wheels: turn off the ignition, put the hose on the bleeder fitting, opening it no more than half a turn. Depress the brake pedal and firmly fix it in this position. Performing this action, you can observe how the brake fluid comes out with bubbles. After that, it is necessary to tighten the fitting and release the pedal.

Next is the back right wheel. To begin with, put the hose on the fitting again, but this time open it completely, for the whole turn. Fully depress the brake pedal. Turn on the ignition without releasing the pedal. Then the pump itself will drive out of brake system all the air, and as soon as you see that the brake fluid comes out without bubbles, you can close the fitting and release the pedal.

And, finally, the algorithm for bleeding the rear left wheel brake. Everything is the same as with the previous wheel, you need to put the hose on the fitting and open it completely. In this case, you do not need to depress the brake pedal. Meanwhile, the included pump will pump out brake fluid along with air. The next thing to do is to press the pedal halfway and tighten the fitting. Depress the brake pedal and wait for a while until the pump stops completely. And in the end, turn off the ignition, not forgetting to connect the connectors to the brake fluid reservoir. An important thing to remember: during the procedure, it is worth making sure that the pump works without liquid, and it cannot work for more than two minutes. When the liquid does not have time to exit during this time, it stops and the whole cycle repeats from the beginning.

At the end of the procedure, it is worth checking the tightness of the brake system, if there are any leaks in it. Also add brake fluid to the reservoir to acceptable level. This completes the whole process.

There are generally accepted precautions when bleeding a car's brake fluid. First - do not allow the expansion tank to be completely empty, because of this, air enters the hydraulic pump, which can only be removed in the workshop using special devices. The second is when replacing brake hose it is necessary to do pumping in the workshop, without which it is impossible to use the car as a means of transportation.

Do not forget that each car model has its own characteristics of bleeding the brakes with the ABS system, so before starting the robots, you should carefully study the manual for driving your particular vehicle, since it necessarily has its own design features.

Peculiarities

From the very beginning we put vehicle so that you can easily get to the brake bleeder fittings. Let me remind you that they are located on the brake cylinders of each wheel.

There are two types of ABS: the first one consists of a pump, a hydraulic valve and a hydraulic accumulator. This type is considered to be the simplest, since the pumping technology is the same as that of standard system braking. Main Feature the second type is that all its elements are located in different places of the car.


Based on these two types of ABS, it becomes clear that the principle of pumping each will be significantly different.

Video “Bleeding brakes with ABS”

The video shows how to bleed the brakes on a Mitsubishi Pajero foreign car with your own hands.

It is no more difficult than bleeding a traditional car brake system. But in order to properly remove air from the brake system on which the ABS system is installed, it is recommended to understand the principle and scheme of its operation specifically for your car. Since depending on the model, the pumping scheme may differ slightly. For example, when the hydraulic valve block and the hydraulic accumulator with the pump are in the same unit, both the replacement of the fluid and the pumping of the brake system with ABS will be carried out in a similar way, as well as.

Types of ABS systems

1. ABS includes: hydraulic valve block, hydraulic accumulator, pump (pumped in garage conditions);
2. The pump, hydraulic accumulator and hydraulic valve block are located at different nodes, such a brake system, in addition to ABS module includes additional ESP modules, SBC (in service station conditions). It is necessary to have a diagnostic scanner to monitor the modulator valves.

Based on the features, we can conclude that before you pump the brakes with ABS, decide on the type of your system, since this instruction will relevant only for standard anti-lock braking system.

Bleeding the ABS brakes

In order to qualitatively complete the task, it is desirable to pump with an assistant, starting to pump the brake system from the front wheels, then the rear wheels (right and left).

The pressure in the brake system with ABS can fluctuate up to 180 atm, which is why the first thing to do is to reset it.

The pressure is released by discharging the pressure accumulator. To do this, turn off the ignition and press the brake pedal about 20 times. And then, to proceed to the next stage of bleeding the brake, disconnect the connectors on the brake fluid reservoir.

The general principle of how to bleed the brakes with ABS

1. We find and remove the fuse in the block responsible for the operation of the ABS;
2. We unscrew the wheel and find the RTC fitting for bleeding the brake;
3. We begin to pump the brakes with abs with the pedal depressed;
4. Turn on hydraulic pump(with ignition on, dashboard) and wait until all the air comes out;
5. We twist the fitting and release the brake pedal, if the ABS light is no longer on, everything is done correctly and the air is completely out.

The sequence of removing air from the vehicle

Let's start pumping the brakes from front right and then left. Procedure happens when the ignition is off.(position to "0") and removed terminal on the TJ tank.

1. We put the hose, with a bottle, on the fitting and open it (with an open-end wrench). Just need to give transparent hose so that air bubbles can be seen, as well as the other end of the hose must be completely immersed in liquid.
2. Fully depress the pedal and hold until all the air comes out.
3. Tighten the fitting and release the pedal as soon as the liquid comes out without air.

Rear wheels pumped with ignition on in key position "2".

1. As with bleeding the front wheels, we put a hose on the bleeder fitting on the caliper.
2. After fully depressing the pedal, turn the ignition key (to start the hydraulic pump). We observe the air outlet and control the level of brake fluid in the reservoir (top up periodically).
   

   In order for the pump not to be out of order, it is necessary to monitor the level of TJ all the time (to prevent running “dry”). And also do not allow to work continuously for more than 2 minutes.

   3. We close the fitting after the complete release of air bubbles, and the pump is turned off and the brake is released.

To properly bleed the brakes with abs on the rear left wheel, the sequence of actions needs to be slightly changed.

1. As in previous cases, we first put the hose on the fitting and unscrew it not completely, but only 1 turn, and the pedal no need to squeeze.
2. Turn the ignition key to start the hydraulic pump.
3. Once the air is out depress the brake pedal to half and tighten the bleed screw.
4. Then we release the brake and wait for the pump to stop.
5. Turn off the ignition and connect the removed connector from the tank.

If you need to bleed the brakes together with the ABS modulator, then information on such a procedure can be viewed.

IN without fail after the brakes have been bled, before leaving, you need to check the tightness of the system and the absence of smudges. Check the brake fluid level.

Good day, dear motorists! Among us, most likely, there is no driver who at least once did not experience a feeling of helplessness at the moment of braking. When the car continues its movement, and not at all in the direction in which the driver wants. Skid.

Fortunately, engineering thought does not stand still. Modern driver armed with a system such as ABS. Let's take a closer look at the system and see if it is possible to bleed the brakes with ABS with your own hands.

What is car ABS

ABS (Anti-lock Braking System) is an anti-lock braking system that prevents the wheels from locking during emergency braking.

Basic ABS task is: adjusting the speed of rotation of all wheels. This is done by changing the pressure in the vehicle's brake system. The process occurs with the help of signals (impulses) from each wheel sensor, which enter the ABS control unit.

The principle of operation of the anti-lock braking system
The contact patch of the wheels of the car is in relative immobility to the roadway. According to physics, the wheels are affected by the so-called. static friction force.

Taking into account the fact that the static friction force is greater than the sliding friction force, with the help of ABS, the rotation of the wheels is effectively slowed down at a speed that corresponds to the speed of the car at the time of braking.

At the moment of the beginning of braking, the anti-lock braking system begins to constantly and accurately determine the speed of rotation of each wheel, and synchronizes it.

Anti-lock system device
Here are the main components of ABS:

• sensors installed on the wheel hubs of the car: speed, acceleration or deceleration;
• control valves installed in the line of the main brake system. They are also components of the pressure modulator;
• the electronic unit ABS control. Its task is to receive a signal from sensors and control the operation of valves.

Bleeding brakes with ABS, taking into account the features of the system

Bleeding the ABS brake system will require you to have certain technical skills. In addition, it will not be superfluous to study the manual for the installation and maintenance of the brake system of your car.

Features of pumping brakes with ABS

• in cars that have in one node: a hydraulic valve block, a hydraulic accumulator and a pump, changing the brake fluid and bleeding the brake system with an anti-lock braking system is done in the same way, you need to turn off the system by removing the fuse. Bleeding of the circuits is carried out with the brake pedal depressed, the RTC bleeder must be unscrewed. The ignition is turned on and the pump expels air from the circuit. The bleeder screw is tightened and the brake pedal is released. An extinguished malfunction lamp is evidence of the correctness of your actions.
• Bleeding of the brake system with ABS, in which the hydraulic module with valves and the hydraulic accumulator are separated into separate units, is carried out using a diagnostic scanner to read information from the ABS computer. You probably don't have it. Therefore, bleeding brakes with ABS of this type, most likely, should be done by you at the service station.
• Bleeding the brake system with ABS and electronic systems activation (ESP or SBC) is made only in terms of service.

How to bleed ABS brakes

It is important! It should be remembered that the pressure in the brake system reaches 180 atm. Therefore, in order to prevent the release of brake fluid, before disconnecting brake lines for any system with ABS, it is necessary to discharge the pressure accumulator. To do this, with the ignition off, press the brake pedal 20 times.

Technology of pumping the brake system with ABS

Bleeding brakes with ABS, like bleeding a conventional brake system, is performed with an assistant. Turn off the ignition (position "0"). Disconnect the connectors on the brake fluid reservoir.

Front wheel brakes:

• put the hose on the bleeder fitting;
• open the fitting for a turn;
• the brake pedal is pressed to the stop and held in the depressed position;
• we observe the exit of the "airy" mixture;
• turn the screw on and release the pedal.

Rear right wheel brake:

• put the hose on the bleeder fitting, unscrew it one turn;
• press the brake pedal to the stop, turn the ignition key to position "2". In this case, the brake pedal is held in the depressed position;
• a running pump will force air out of the system. That is, as soon as the brake fluid begins to come out without air bubbles, close the fitting and release the brake.

Rear left wheel brake

• the hose is put on the fitting and unscrew it 1 turn;
• DO NOT press the brake pedal;
• a working pump pushes out the “airy” mixture;
• press the brake pedal halfway and tighten the fitting;
• release the pedal and wait for the pump to stop completely.

IN reverse order: turn the ignition key to "0", connect the connectors to the brake fluid reservoir, carry out a leak test of the brake system (see ABS fault indicator).

Good luck with bleeding your ABS brakes.

Bleeding the brakes has never been something very difficult and problematic for motorists, this work took an average of 1.5-2 hours. However, with the advent of cars with an ABS system, the task has become much more complicated, and most drivers will not be able to answer the question of how to pump the brakes with ABS.

The process of pumping the brake system with ABS cannot be called laborious or too complicated, the whole problem is that you need to know the sequence of this work and then everything will work out. Today I will tell you how to properly bleed the brakes with the ABS system at home without anyone's help.

How to bleed ABS brakes - step by step instructions

There are two types of ABS systems that bleed differently. Their differences lie in the location of the nodes and the principle of action.

First ABS type includes: pump, hydraulic valve block and hydraulic accumulator. Such an ABS scheme is considered the simplest, and therefore it is pumped almost like an ordinary brake system.

In order to bleed the ABS brake system, follow these steps:

1. Produce visual inspection main unit of the system.
2. Find the fuse that is responsible for the operation of the entire ABS systems and remove from the nest. Thus, you turn off the system completely.
3. Locate the fitting and the bleed RTC. Unscrew it and start pumping.
4. Bleeding the brakes with ABS is done with the pedal depressed, to check the operation, turn on the ignition, the ABS malfunction indicator will light up on the instrument panel.
5. Turn on the pump and wait until the air is completely out of the system.
6. When the light goes out, this will mean that the system has been pumped correctly.

Brakes with ABS of the second type, in which the main components (pump, accumulator and hydraulic valve) are located in different places, are pumped differently.

In order to bleed the brakes with this type of ABS, you need to have a special scanner that reads the computer data coming from the ABS unit. Given the cost of this device, it is unlikely that it will be cheaper to do this work at home; perhaps it would be more profitable to go to the service station.

In addition, such systems often have additional modules (ESP, SBC), which one way or another will need to be tested, and this can only be done in the service.

Brakes with this type of ABS are bled as follows:

Note: This instruction on how to bleed ABS brakes contains general rules and recommendations, for each car model, this procedure may vary slightly.

First of all, you need to find a partner and relieve the pressure in the system, which often reaches 180 or more atmospheres. It is not recommended to work with the system with such pressure. In order to relieve pressure, you need to turn off the ignition and apply the brakes about 10-20 times. Disconnect the connectors on the tank with TJ (brake fluid).

First, we pump the brakes of the front wheels:

1. Switch off the ignition.
2. Put the hose on the bleeder fitting.
3. Open the fitting half a turn.
4. Fully depress the brake pedal and lock in that position. In this case, you will see how to exit the TJ with bubbles.
5. When the bubbles run out, tighten the fitting and release the pedal.

1. Put the hose on the bleeder fitting, unscrew it a full turn.
2. Depress the brake pedal to the floor.
3. Turn on the ignition, do not release the brake pedal.
4. The pump will expel all the air from the brake system, as soon as you see that there are no “bubbles” and the fluid goes without air, close the fitting and release the pedal.

Now it's the turn to pump the brakes of the rear left wheel:

1. Put the hose back on the fitting and unscrew it a full turn.
2. This time we do not press the brake pedal.
3. The switched on pump pumps out the “airy” TJ.
4. Next, press the pedal halfway and tighten the fitting.
5. Depress the brake pedal and wait for the pump to stop completely.
6. Turn off the ignition, connect the connectors to the TJ tank.

Upon completion, check for leaks, check the tightness of the brake system. Add brake fluid to reservoir until required level. At this pumping of brakes with ABS can be considered complete. Assemble the tool, wash your hands and test the brakes while driving. Be careful not to accelerate too fast, first check the brakes at a low speed.

During the operation of the car, the driver needs to pay close attention to the systems and mechanisms that are responsible for driving safety. And if one day, when you press the brake pedal, it quickly rests on the floor, and the car does not slow down, then you should go for repairs. Any action aimed at depressurization hydraulic drive brakes, lead to airing of the tract. To delete air locks From a braking system equipped with ABS, a series of simple operations must be performed in sequence.

Description of the ABS brake system

As evolutionary development The car is constantly being upgraded brake units. This is due to the special importance of serviceable brakes for safe ride. For changing mechanical drive came pneumatic and hydraulic amplifiers. And in last years the term ABS has firmly entered the lexicon of a modern motorist.

The ABS (Anti-lock Braking System) system is adopted by almost all automotive manufacturers. Already in basic configuration this option is present even in the most budget models. This is done so that in the most difficult driving situations, the car could stop as safely as possible without entering dangerous drifts. After all, even experienced drivers can get confused for a moment in stressful situations.

The job is to prevent complete blocking wheels when you need to brake hard. It is possible to achieve coordinated work of all brake mechanisms due to a change in pressure in the individual nodes of the system. This control of the brakes allows you to effectively and quickly stop the vehicle. At the same time, the car does not change its direction of movement on its own and remains under the control of the driver.

The main nodes of the ABS are:

• control unit with electronic stuffing, which receives signals from sensors and controls the operation of the valves;
• valves are built into the path of the brake system, their task is to dose the volume of incoming fluid;
• brake sensors are located on the wheel hubs, they provide information about the speed of the car.

Features of pumping brakes with the ABS system

Various models of modern iron horses equipped with different ABS options. In some cases, you can independently cope with the removal of air from the brake path, and sometimes it is easier to provide the car to specialists from the service station.

1. If the valves and the accumulator are located at different points in the car, then a diagnostic scanner will be required to service the brakes. He must read the sensor readings from the control unit and decipher them. Not every motorist has such devices, so you will have to pump the brake system in a car service.
2. Many brake mechanisms are equipped with other ABS, where a set of valves, a hydraulic accumulator, and a pump are located in one housing. In such a machine, you can pump the path yourself. It is enough to disable the ABS by removing the appropriate fuse in order to carry out repairs or maintenance like old cars without this option.
3. In some modern cars the anti-lock braking system is complemented by options such as SBC and ESP. In this case, the alternatives after-sales service no car.

Preparatory work

Bleeding ABS brakes is faster, more convenient and viewing hole or overpass. Before you go under a car with a hose and a bottle, you need to do a few preparatory operations. And first of all, you should determine the type of anti-lock braking system.

1. If the most simple ABS, in which all the main components are placed in one housing, then you need to find a fuse. It is usually located in the main unit of the system. Removing the fuse will completely disable the anti-lock braking system. When the ignition is on, a malfunction with the ABS will be signaled by the corresponding light.
2. IN engine compartment it is necessary to unscrew the cap on the expansion tank of the brake system. You must first remove the connector from the electrical sensor.
3. After that, you will have to look under the car, find a bleeder fitting on each working cylinder and loosen each of them. At this stage, it is important not to break the "downers", otherwise the work will be significantly delayed in time. It is better to pre-treat the fittings with brake fluid or special tool type WD-40.
4. To do the job neatly and efficiently, it is necessary to prepare a flexible clean hose, the inner diameter of which will correspond to the size of the fitting. It is necessary to pour about 1/3 of the brake fluid into the bottle.

ABS brake bleeding options

Bleeding air from the brake path in vehicles equipped with ABS can be done in two ways. In any case, you need to use the services of an assistant.

Option number 1

At complete shutdown anti-lock braking system, the sequence of actions looks like this.

1. It is recommended to bleed the brakes according to a certain scheme, which is indicated in the car manuals. Usually, the farthest node from the main one is pumped first. brake cylinder. It's right rear wheel. A hose is put on the fitting, and its other end is lowered into a container with brake fluid.
2. The assistant sits behind the wheel of the car and presses the brake pedal several times. On the last press, it is important to hold the pedal until the air is expelled.
3. At the moment when the assistant holds the pedal down, unscrew the fitting. As soon as air or liquid stops flowing, the fitting is immediately wrapped. The operation can be repeated 2-3 times if the bubbles continue to come out of the working cylinder.
4. The next node to be pumped will be the rear left wheel. The sequence of actions to remove air will be similar.
5. Third in line will be the front right stopping support. And to complete the bleeding of the brakes should be on the left front caliper.
6. After removing air from each working cylinder, it is advisable to look into expansion tank. Do not allow the liquid to completely leave the tank. Otherwise, a portion of the air will again be in the tract. It is necessary to add only clean technical fluid compatible with the "brake" that is used in the car.

Option number 2. Bleeding ABS brakes with built-in pump.

In this case, after preparatory work it is necessary to provide for the possibility of including this electrical appliance. It is best to work together.

1. To bleed the right rear brake cylinder, a hose is put on the fitting, the second end of which is immersed in a container with brake fluid. After that, the fitting is unscrewed by 1-1.5 turns.
2. The assistant at this moment presses the brake pedal and starts the engine. The pump begins to create pressure in the tract, expelling air. As soon as the bubbles stop getting into the bottle, you need to turn off the engine.
3. The rear left wheel bleed looks like this. A flexible hose is attached to the fitting and lowered into the solution technical fluid. "Spusknichok" turns away 1 turn.
4. Now you need to run power unit. When the bubbles stop going into the fluid container, press the brake pedal about half way. After that, immediately tighten the fitting.
5. The brake pedal can be released and the ignition switched off.
6. In the process of work, it is important to add brake fluid to the reservoir in a timely manner.

After pumping brake mechanism tighten all fittings, replace the cover and connect the connector. Being under the machine, you can at the same time check the tightness of pipelines, working cylinders and fittings. If everything is dry under the car, you can safely drive.