How to bleed the abs brake system How to bleed the brakes with the ABS system? How to bleed ABS brakes - step by step instructions

It has never been something very difficult and problematic for motorists, the completion of this work took an average of 1.5-2 hours. However, with the advent of cars with the 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.

Pumping process brake system with ABS, it cannot be called laborious or overly complicated, the whole problem is that you need to know the sequence of doing this work and then everything will work out. Today I will tell you how to bleed abs brakes at home without any 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.

The first type of ABS includes: a pump, a hydraulic valve block and a 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. Locate the fuse that is responsible for the operation of the entire ABS system and remove it from the socket. 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 how to bleed brakes with abs 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. Press 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 liquid 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.

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 braking system (ABS) prevents the wheels from locking during hard braking, while providing protection against loss of control over the car. 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 force of static friction is greater than the force of sliding friction, anti-lock 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 carry out pumping ABS 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 anti-lock braking system malfunction indicator will light up when ignited. 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.

Second ABS type 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 expel all the air from the brake system, and as soon as you see that the brake fluid is flowing 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 switched on pump will pump out the 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, remembering to connect the connectors to the tank brake fluid. 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 complete devastation expansion tank, 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 ABS system, therefore, before starting the robot, you should carefully study the manual for controlling your particular vehicle, since it necessarily has its own design features.

Peculiarities

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

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.

The main task of the ABS is to regulate 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;
  • ABS electronic control unit. 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 with electronic activation systems (ESP or SBC) is carried out only under service conditions.

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 the brake lines for any system with ABS, it is necessary to discharge the pressure accumulator. To do this, with the ignition off, press 20 times on brake pedal.

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 the 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.

We think that there are no such drivers among us who have not experienced helplessness during braking. When the car continues to move in a completely different direction than you would like, this is a skid.

Well, at least engineering ideas do not stand still. Almost every driver has a system such as ABS. Let's take a closer look ABS system, and find out if it is possible to bleed the brakes with ABS yourself.

The concept of car ABS

ABS (Anti-lock Braking System) is an anti-lock system that prevents the wheels from locking in the event of hard braking.
The ABS system regulates the speed of rotation of all wheels - this is its main task, carried out by changing the pressure in the vehicle's brake system. This process occurs with the help of pulses (signals) from sensors on all wheels coming to.

How the anti-lock braking system works

Relative to the road surface, the contact patch of the wheels is, in principle, motionless. We also know from the course of physics that the static friction force acts on the wheels.
Given that the sliding friction force is less than the static friction force, ABS effectively slows down the rotation of the wheels at a speed corresponding to the speed of the vehicle during braking.

Video

When we start to slow down, the anti-lock system constantly and quite correctly determines the speed of rotation of the wheels, and synchronizes it.

The structure of the anti-lock system

Basic elements of ABS:
- control valves that are installed in the line of the main brake system. Valves are also components of the pressure modulator;
- sensors that are installed on the wheel hubs of the machine: acceleration, speed, deceleration;
- ABS electronic control unit. Its function is to receive a signal from the sensors and control the actions of the valves.

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

To bleed brakes with ABS, you need to have some technical skills. In addition, you must read the instructions for the device and operation of the brake system of the car.

Bleeding brakes with ABS, its features:
- if the hydraulic valve block, the pump and the hydraulic accumulator are located in the same unit in the car, then, with the replacement of the technical fluid, the brake system is bled in the same way as the brakes are bled on a car without ABS (we turn off (remove) the fuse, thereby turning off the system). By pressing the brake pedal, and by unscrewing the RTC bleeder, we bleed the circuits. Then turn on the ignition - the pump will expel air from the circuit. Now we twist the fitting and release the brake pedal. If the light bulb ABS malfunction” went out, so you did everything right.
- if the hydraulic module with valves and the hydraulic accumulator are located in different units, then the brake system is bled using a diagnostic scanner that takes data from the ABS computer. However, you probably don't have it. Thus, brakes with ABS are only pumped to.
- Brake system with ABS and electronic system activation (SBC or ESP) is pumped only in a car service.

How to bleed the brake system with ABS

Attention! We should not forget that the pressure in the brake system can reach 180 atmospheres. Therefore, before separating brake lines For any brakes with ABS, the pressure accumulator must be discharged. To do this, turn on the ignition and apply the brake approximately 20 times. All this is done in order to prevent the release of technical fluid.

The process of bleeding the brake system with ABS

Any self pumping brakes, whether it is brakes with ABS or conventional, is carried out with a partner. First, the ignition is turned off - position "0". Disconnect the connectors on the brake fluid reservoir.

Front wheel brakes:


- depress the brake pedal to the stop and hold it in that position;
- we see the exit of the "airy" mixture;
- the fitting is twisted and the pedal is released.

Rear right wheel brake:
- a hose is put on the bleeder fitting, and the fitting is unscrewed;
- the brake pedal is pressed to the stop, holding it, the ignition key is turned to position "2";
- with the help of a running pump, air will be released from the system. Those. the fitting is closed and the brake pedal is released when technical fluid will come out without air bubbles.

Rear left wheel brake:
- a hose is put on the bleeder fitting;
- the fitting opens on a turn;
- the brake pedal is not pressed;
- by means of a working pump, an “airy” mixture will come out of the system;
- the brake pedal is pressed halfway and the fitting is tightened;
- the brake pedal is released, and now we are waiting for the pump to stop completely.

In this article we will tell you how to properly bleed the brakes with ABS.

Signs you need to bleed your ABS brakes

Air also enters the anti-lock braking system. Since the circuit of such a brake system is hydraulic, air significantly impairs its performance. Determining the accumulation of air in the circuit of the brake system is quite easy. If the kickback of the brake pedal becomes softer when pressed, it means that air has appeared in the brake system.

In an ABS brake system, air may enter the the following cases:

— When repairing hydraulic drive brake system;

— When replacing a caliper on one of wheel hubs;

— In case of a long idle time of the car;

- In case of ongoing repairs various nodes vehicle braking system;

- When replacing the entire volume of brake fluid in the circuit.

A modern anti-lock braking system consists of the following main components:

- hydraulic accumulator,

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