We think that there are no such drivers among us who did not feel helpless during braking. When the car continues to move in a completely different direction than you would like it to be, it is a skid.

Well, at least engineering thoughts do not stand still. Almost every driver has a system such as ABS. Let's take a closer look at the ABS system, and find out if you can bleed the ABS brakes yourself.

Car ABS concept

ABS (Anti-lock Braking System) is an anti-lock system that prevents the wheels from locking in case 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 brakes. This process occurs with the help of pulses (signals) from sensors on all wheels arriving at.

How anti-lock braking system works

Relatively road surface the contact patch of the wheels is, in principle, motionless. We know from the physics course that the resting friction force acts on the wheels.
Considering that the sliding friction force is less than the static friction force, with the help of ABS, the rotation of the wheels is effectively slowed down at a speed corresponding to the speed of the vehicle during braking.

Video

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

Anti-lock braking system structure

The main elements of ABS:
- control valves, which are installed in the line of the main brake system. The valves are also part of the pressure modulator;
- sensors that are installed on the wheel hubs of the car: acceleration, speed, deceleration;
- electronic control unit ABS. 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 the brakes with ABS, some technical skills are required. In addition, it is necessary to read the instructions for the device and operation. brake system car.

Bleeding brakes with ABS, its features:
- if the hydraulic valve block in the car, the pump and the accumulator are located in one unit, then, with the replacement of the technical fluid and the bleeding of the brake system, it is done in the same way as bleeding the brakes on a car without ABS (turn off (remove) the fuse, thereby turning off the system). Pressing the brake pedal, and unscrewing the RTC bleed nipple, we bleed the circuits. Then we turn on the ignition - the pump will expel air from the circuit. Now we tighten the union and release the brake pedal. If the light " ABS malfunction"Has gone out, which means you did everything right.
- if the hydronic module with valves and the accumulator are in different units, then the brake system is bleed using a diagnostic scanner that takes data from the ABS computer. However, you most likely do not have it. Thus, brakes with ABS are pumped only on.
- The brake system with ABS and with an electronic activation system (SBC or ESP) is pumped only in a car service.

How is the bleeding of the brake system with ABS

Attention! It should not be forgotten that the pressure in the brake system can reach 180 atmospheres. Therefore, before disconnecting the brake lines for any brakes with ABS, the pressure accumulator must be discharged. To do this, turn on the ignition and press the brake about 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 of the brakes, whether it is brakes with ABS or conventional brakes, is carried out with a partner. First, the ignition is switched off - position "0". The connectors on the brake fluid reservoir are disconnected.

Front wheel brakes:


- the brake pedal is squeezed out to the stop and kept in this position;
- we see the exit of the "airborne" mixture;
- the fitting is twisted and the pedal is released.

Rear right wheel brake:
- a hose is put on the bleed nipple, and the nipple is unscrewed;
- the brake pedal is pressed against the stop, holding it, the ignition key turns to position "2";
- with the help of a running pump, air will escape from the system. Those. the union is closed and the brake pedal is released when technical liquid will come out without air bubbles.

Rear left wheel brake:
- a hose is put on the bleed nipple;
- the choke opens a turn;
- the brake pedal is not pressed;
- by means of a working pump, the "airborne" mixture will be released from the system;
- the brake pedal is pressed halfway and the union is twisted;
- the brake pedal is released, and now we are waiting for the pump to completely stop.

August 31, 2017

Anti-lock braking system (abbreviated - ABS), which prevents the vehicle from skidding during hard braking, is installed on most passenger cars, including domestic production... Since a large part of motorists are engaged in self-service and repairing their " iron horses", A natural question arises, how to properly bleed the brakes with ABS in garage conditions... To get a definitive answer, you need to find out how the new system differs from the old one and consider air removal technology.

Additional elements of brake circuits

The disadvantage of the old brakes was the blocking of one or more wheels when the pedal was pressed “to the floor”. As a result, the car lost controllability and went into a skid, especially on slippery road... Later traditional system has undergone modernization by adding the following elements:

• hydraulic valve block;
• electric pump;
• capacity - accumulator;
• wheel rotation sensors;
• electronic control module (ECU).

The listed nodes and parts are components anti-lock braking system... Thanks to them, the car with ABS never skidding, since the automatic simulates repeated sharp depressions on the brake pedal, although the driver presses on it all the way.

There are 2 types of brake circuits on cars: three- and four-channel. In the first case, the front wheels are connected to the master brake cylinder by separate branches, and the two rear wheels are connected by a single circuit. In the second scheme, each wheel has its own liquid line.

To understand the difference between pumping a brake system with ABS, you should understand its work:

1. When the driver brakes in normal road conditions, the sensors on the wheels record approximately the same deceleration (taking into account the cornering) and ABS does not manifest itself in any way.
2. At hard pressing on the pedal, one or more wheels are blocked and rotate slower than the others, which is reported by the sensor to the ECU.
3. At the command of the controller, the valve body opens the corresponding valve and the pressure in the circuit of the stopped wheel drops. Excess brake fluid flows into the storage tank.
4. The pads release the disc (or drum) and the wheel spins with the rest. But since the goal is to quickly brake, the ECU switches the valves again, the pads "grab" and hold the disc until the sensor locks again. The cycle is repeated until it stops completely.
5. To prevent the pressure in the master cylinder from dropping during the actuation of the valves, the electric pump replenishes the brake fluid by pumping it out of the accumulator.

One described cycle takes a fraction of a second. The interaction of the fluid circuits with the ABS is felt at the fully depressed pedal. Due to the quick actuation of the valves and the pumping of fluid by the pump, the driver feels a series of jolts.

Preparation for pumping

As a rule, the ingress of air into the lines and units is associated with a malfunction or its elimination. It is necessary to remove air bubbles that impede effective braking after disassembling the calipers, disconnecting the pipes or repairing the master cylinder.

The algorithm of operation of the automatics and valve body present in the vehicle's brake system provides for the preservation high pressure in the main fluid circuit. If the venting procedure is initiated without proper preparation, fluid may spill out. Therefore, before bleeding the brakes from the ABS, the pressure must be reduced. This is achieved by pressing the pedal 20 times with the ignition off.

What is required for work:

• aerosol lubricant WD-40;
• box wrench for unscrewing the fittings on the working cylinders of the wheels;
• plastic bottle and tube, suitable in diameter to the fitting;
• supply of fresh brake fluid.

Important! If in your car the hydraulic accumulator, valve and pump units are installed in different places or combined with elements of another automatic system- ESP, then you should not undertake self-pumping. You will need a special scanner that interacts with the electronic valve control unit.

The last action before pumping is to deactivate the ABS. To do this, take the operating instructions, open the fuse diagram and find the one that is responsible for the operation of this system. Then remove it from the slot.

If the design of the front and rear suspension, then the wheels can not be removed - unscrew the fittings from the inspection ditch.

Air removal procedure

Bleeding the brake system with ABS begins with the treatment of all fittings on the working cylinders with WD-40 grease. During operation, they manage to rust and often break when trying to loosen with a key. Then proceed according to the instructions:

1. Open up expansion tank and add brake fluid there to MAX marks... In the process of work, monitor the level and constantly replenish the container so as not to air the lines on a new one.
2. Ignition OFF, disconnect the wires from the expansion tank cap.
3. Slide the clear tube over the cylinder fitting front wheel and unscrew it 1 turn.
4. Depress the brake pedal "to the floor" and do not release, which will lead to the outflow of fluid with air bubbles.
5. When clean brake fluid comes out, screw on the union and drop the pedal. Top up the level in the reservoir and repeat the operation on the second front wheel.

As you might have guessed, the airing of the front wheel contours is carried out due to the gravitational drainage of the liquid. So, if desired, the operation can be performed without assistance. But it is much more difficult to pump the rear contours for one person. The gravity method will not work here - the tubes are too long and not always inclined towards the working cylinder. The pumping starts from the right rear part and is carried out according to the following algorithm:

1. Put the hose back on the nipple and turn it out 1 turn with a wrench.
2. Depress the brake pedal all the way. While holding it down, turn on the ignition.
3. The automation will start the return pump, which will squeeze out the liquid through the open fitting.
4. As soon as you notice that there are no bubbles in the tube, tighten the union and release the brake.

The rear left cylinder is pumped differently. At first, the pedal is not squeezed out, the ignition remains on, and the fitting with the hose fitted is immediately unscrewed. The pump will restart and pump fluid through the hole. When the air stops coming out, press the brake halfway and close the union. When the pump builds up pressure in the system and stops, add fluid to the reservoir one last time, screw the plug and connect the connector.

There is an opinion that it is much more difficult to pump the brakes on an automatic machine than on a car with a conventional mechanical box gear. Such claims are groundless, since the brake circuits have nothing to do with the gearshift mechanism in the car. The air removal technology is exactly the same in both cases.

At the end of the work, make sure that the working cylinders do not leak and the level in the expansion tank does not drop. Install the fuse in the slot, then test the car on the move, trying to brake with different degrees of efficiency.

Reference. In some car models, it is not possible to expel air in the usual way. If tests have shown that the brake pedal responds sluggishly, the procedure will have to be repeated with the engine running.

Thanks to the presence of an electric pump in the ABS system, you can try to pump the brakes yourself, if there is no one to invite for help. In this case, the pedal should not be pressed, but only unscrew the fittings and turn on the ignition. An extinguished light on the instrument panel will signal the success of the operation.

It 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 the system, the task has become significantly more complicated, and most drivers will not be able to answer the question of how to bleed the brakes with the ABS.

The process of pumping the brake system with ABS cannot be called time-consuming 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 bleed brakes with ABS system at home without anyone's help.

How to bleed ABS brakes - step by step instructions

There are two types ABS systems that are pumped in different ways. Their differences lie in the location of the nodes and the principle of action.

The first type of ABS includes: a pump, a valve block and a hydraulic accumulator. This ABS scheme is considered the simplest, and therefore it is pumped almost like an ordinary brake system.

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

1. Produce visual inspection the main unit of the system.
2. Find the fuse that is responsible for the operation of the entire ABS system and remove it from the socket. This will shut down the system completely.
3. Find the fitting and the pumping RTC. Unscrew it and start pumping.
4. The ABS brakes are pumped when the pedal is depressed, to check the action, turn on the ignition, the ABS fault indicator on the instrument panel will light up.
5. Turn on the pump and wait until the air is completely out of the system.
6. When the light goes out, it 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 in a different way.

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. Considering the cost of this device, it will hardly be cheaper to do this work at home, perhaps it will be more profitable to go to a 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.

ABS brakes of this type are pumped as follows:

Note: This instruction on how to bleed brakes with ABS contains general rules and recommendations, for each car model this procedure may differ 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 press the brakes about 10-20 times. Disconnect the connectors on the reservoir with TJ (brake fluid).

First, we pump the front wheel brakes:

1. Switch off the ignition.
2. Put the hose on the bleed nipple.
3. Open the union half a turn.
4. Depress the brake pedal fully and lock in this position. In this case, you will see how to leave the TJ with bubbles.
5. When the bubbles run out, tighten the fitting and release the pedal.

1. Put the hose on the bleed nipple, 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 time to pump the brakes of the rear left wheel:

1. Put the hose back on the fitting and unscrew it a full turn.
2. Do not press the brake pedal this time.
3. The switched on pump pumps out the "airborne" TZh.
4. Then press the pedal halfway and tighten the union.
5. Depress the brake pedal and wait for the pump to come to a complete stop.
6. Switch 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 the reservoir to the required level. At this, bleeding the brakes with ABS can be considered complete. Collect the tool, wash your hands and check the brakes while driving. Be careful not to accelerate too much, check the brakes at low speed first.

In order to bleed the brakes on own car experienced driver do not have to spend a lot of time. This process can be completed without much rush in 1.5-2 hours. But this is possible only on those cars on which the standard system braking.

However, it has long ceased to satisfy motorists and modern cars is increasingly being installed. And so to carry out pumping on a car with ABS for many is not an easy task, and the point here is not complexity, but ignorance.

All you need to know for this is the sequence of performing all the necessary tasks for correct pumping... This is exactly what will be discussed in the article below. However, do not forget to familiarize yourself in more detail with what the anti-lock braking system is and how it functions on a car.

1. What should be understood by automobile ABS: we understand the peculiarities of the functioning of the system

Much depends on the correct operation of the brake system - both the maneuverability of the car and the safety of the driver. But, probably, many have had such situations when, during braking, the car begins to behave in a completely uncontrolled manner - you press the brake pedal, and your car is completely carried away opposite side... It was in order to avoid such situations that automotive engineers created the newest ABS system.

ABS- this is an English abbreviation, which should be understood as phrases Anti-lock Braking System. It is translated into Russian as an anti-lock braking system, the main task of which is to prevent wheel blocking during emergency braking, as well as to regulate the speed of rotation of automobile wheels. The possibility of such control was obtained due to the fact that engineers learned to change the pressure directly in the braking system. Directly on the car itself, an anti-lock system control unit is installed, which receives pulses from the sensors installed on each wheel.

It would seem: what a wonderful invention, now you can forget about accidents on the roads and car drifts. But it was not there. After the ABS was designed, it began to be actively installed on cars. But still, Insurance companies decided to test the effectiveness of such a system and compare how many cars with the standard and with new system braking get into accidents. As it turned out, the anti-record is set by cars with an anti-lock braking system installed on them. In particular, the number of accidents that occurred when braking on a dry surface increased to 42%, and on a wet surface to 65%. So ABS makes the braking system even more useless?

Experts say that the point is not in ABS, but in the perception of the driver. After all, such a sophisticated system creates an illusion of safety in a person, as a result of which he ceases to closely monitor the entire driving process. Many people forget that although the system avoids locking the brakes and retains the ability to control the course and turns of the car, it is not able to shorten the braking distance. Sometimes there are situations that without blocking the wheels on a dry road, the car makes even more braking distances than without ABS.

It proves the importance of driver's vigilance and experience and the following fact, which journalists and motorists were able to find out during the tests. The purpose of the test was to determine how the car would react to an unsuccessful hill climb. If all ordinary cars passed it normally and, thanks to engine braking, were able to gently go down, but cars with ABS without a handbrake just flew off the hill.

So before buying a car with an anti-lock braking system, you should be very familiar with the features and principles of its operation. After all, like any other mechanism, it works by its own rules, having mastered which you can really feel like the king of the road.

2. We get acquainted with the principle of operation of the anti-lock braking system while the car is moving

So, the anti-lock braking system of a car is made up of three essential elements, which are:

- electronic control unit, which is installed directly under the hood of the car;

The hydraulic unit, which is located directly in brake line behind the brake master cylinder. The block valves control the fluid pressure indicator within the brake system;

Wheel speed sensors that are installed on each wheel and transmit information to the electronic unit.

ABS operation starts from the moment the car ignition is turned on and it reaches the lowest speed while driving. The sensors installed on the wheels work on the principle of electromagnetic induction. When driving, the wheel rotates and drives the teeth and cavities of a special rotor, which are in close proximity to the sensor. By their rotation, they lead to the appearance of an electrical signal in the sensor winding. The frequency of the emerging signal will be proportional to the indicator angular velocity wheels, as well as the number of teeth on the rotor. Then the process takes place according to the following algorithm:

When, during braking, the wheel begins to block, the sensor instantly detects this and transmits the corresponding information to the electronic unit;

Receiving information from all four wheels and processing it, the electronic unit transmits an impulse with an "order" to solenoid valve installed on the hydraulic block;

In a situation where the braked wheel begins to slide along the road, the valve body valves react by lowering or temporarily stopping the supply of fluid to the working brake cylinder, which is often not enough to completely unlock the wheel - then the system proceeds to the next stage of the algorithm;

The brake fluid is directed by the valve into the return line, which leads to a decrease in the pressure in the working brake cylinder. The wheel starts to turn again;

When the wheel reaches a certain speed, the anti-lock braking system is released, which opens the valves and returns required level hydraulic pressure on the brake.

It is worth paying your attention to the fact that the process of braking and braking of the wheels will take place periodically, as a result of which the driver sitting in the cab will feel the ABS work in the form of frequent and rather sharp jolts that are transmitted to the brake pedal. This happens until the wheels stop blocking or the car comes to a complete stop.

3. We understand why it is necessary to bleed the brakes and how often should it be done?

For proper operation of the brake system, it must be carefully monitored and serviced regularly. The drivers are used to the fact that the only trouble with her is simple replacement brake discs and pads. However, don't forget about pumping the brakes.

Generally speaking, the brake system is being pumped in order to pump out all the air from it that interferes with its full functioning. For example, you may accidentally damage the hose or the branch pipe of the brake system, which, as a result, will lead to depressurization of all systems.

In order to determine how often you need to bleed, you need to read the manufacturer's instructions for changing the brake fluid. The standard instruction will indicate that such work should be carried out approximately once a year, or after the car has wound 50-60 thousand km of run. Along with changing the fluid, it will be nice to bleed the brakes, because together with new liquid very often the air enters it. But that's according to plan. In fact, there may be other reasons for this:

- you noticed that the braking system began to behave not quite as usual. For example, the working stroke has significantly increased or an unusual "softness" of the brake pedal has appeared;

After repairing the brake system, when air could get into it;

If the most important thing in the tank brake cylinder the brake fluid level has dropped unexpectedly.

4. How is the bleeding of the car's ABS brakes carried out?

Bleeding the brakes on a car with an anti-lock braking system requires the driver to have not only theoretical knowledge, but also technical skills. It will not be superfluous to know how the braking system functions on your car itself. After all, each brand and model may have its own characteristics, which should be taken into account. Otherwise, bleeding the brakes may result in irreversible damage to the car for you, especially if the ABS is installed on it.

Features to consider when working with an ABS vehicle

Before you start pumping the brakes, you should pay attention to the design features of the automotive mechanism. Indeed, in the event that the hydraulic valve block, the hydraulic accumulator and the pump are located in one unit, then both the replacement of the brake fluid and the direct bleeding of the brake system should be carried out in exactly the same way as for cars without ABS.

The system is turned off by a banal fuse notch. When the brake pedal is pressed, the circuits are pumped, during which it is also necessary to unscrew the RTC bleed nipple. If you turn on the ignition of the car, the pump will begin to pump out air from the circuit. After that, we tighten the union back and completely remove the foot from the brake pedal. That's all, the brake system has been bleed. During all these works, you will have a blinking light that indicates a malfunction of the anti-lock braking system. If at the end of the whole process it goes out, it means that you did everything correctly and successfully.

In the same case, if the hydraulic module with valves and the hydraulic accumulator are located in different parts of the automobile body, a special diagnostic scanner is needed to bleed the brakes. With its help it will be possible to obtain information electronic unit ABS control. It is quite difficult to find such a scanner, and it is not entirely profitable to purchase it. In this regard, the pumping of the brakes on such cars is mainly carried out at the service station.

Also, not only ABS can be installed on the car, but also electronic systems activations such as ESP or SBC. In this case, it will be possible to bleed the brake system only in the service and with the help of experienced specialists.

Getting started pumping

So, in order not to cause any damage to the car mechanism, you should immediately remember the following rule.Since the pressure in the brake system usually reaches 180 atm, the pressure accumulator must first be discharged to carry out the bleeding. Moreover, this must be done even before they are disconnected. This is done so that there is no release of brake fluid. To do this, with the ignition off, press 20 times brake pedal car.

You should start the main pumping process with your partner. We put the ignition of the car at “0”, that is, turn it off completely. Further on the tank with brake fluid you need to disconnect the connectors. After that, for each brake, its own mandatory algorithm of operations is carried out.

1. To bleed the brakes of the front wheels of the car, you must:

Put a hose on the bleed nipple;

The union must be opened approximately one turn;

The assistant, who remains in the car, must depress the brake pedal to the limit and hold it in this position for a while;

All this time it will be possible to observe the gradual release of the "airborne" mixture;

After the brake system is completely cleaned, the union must be screwed back and only after that it will be possible to release the brake pedal.

2. The brake, which is located on the rear right wheel, must be pumped according to the following algorithm:

We put on the hose in the same way on the bleed nipple and also open it one turn;

We hold down the brake pedal all the way, but at the same time we also turn the ignition key and leave it in the "2" position. The brake pedal must never be released;

- since the pump will actively work at this time, it will itself draw all the air from the brake system. It is necessary to monitor what kind of brake fluid comes out: if it comes with bubbles, then we continue pumping, if it goes clean, tighten the union and release the brake pedal.

3. Bleeding the rear left wheel brake is carried out in a slightly different way:

As in the above options, it is necessary to put the hose on the fitting and unscrew it a little (no more than 1 turn);

Do NOT clamp the brake pedal;

- the "airborne" mixture itself will begin to come out through the hose thanks to the running pump;

After the normal fluid starts to flow, you need to tighten the union, but for this you must simultaneously press the brake pedal, but do not clamp it all the way - you need to hold it in the middle position;

We release the pedal and wait for the pump to completely stop its work.

Next, we completely complete the bleeding process: put the ignition on position "0", reconnect the connectors to the brake fluid reservoir, check how tight the connections of the car's brake system are. Well, do not forget to look at the malfunction indicator ABS work... We hope that if you carefully follow the instructions described, it will not burn for you.

It is not at all more difficult than bleeding the traditional braking system of a car. 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 a block of hydraulic valves and a hydraulic accumulator with a pump are in the same unit, the replacement of the fluid and the bleeding of the brake system with ABS will be carried out in the same way as.

Types of ABS systems

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

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

The process of bleeding ABS brakes

In order to qualitatively perform the task, it is advisable 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 braking system with ABS can fluctuate up to 180 atm, which is why the first thing to do is to reset it.

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

General principle of how to bleed ABS brakes

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 pumping the brake;
3. We begin to pump the brakes from the abs with the pedal depressed;
4. We turn on the hydraulic pump (turning on the ignition, on dashboard) and wait until all the air comes out;
5. We tighten the union and release the brake pedal, if ABS bulb does not burn anymore - everything is done correctly and the air is completely out.

The sequence of removing air from the vehicle

We start pumping the brakes from the front right and then left. Procedure occurs when the ignition is off(position at "0") and removed terminal on the TZ tank.

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

Rear wheels are pumped with ignition on at key position "2".

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

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

   3.Close the union after full exit air bubbles, the pump is switched off and the brake is released.

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

1. As in previous cases, first we 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 squeeze the brake pedal halfway and twist the pumping union.
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 this procedure can be viewed.

V mandatory after you have pumped the brakes, before leaving, you need to check the tightness of the system and the absence of leaks. Check the brake fluid level.