How to properly bleed the brakes on a LADA alone

Anti-lock braking system ABS: types, types

Depending on the type and type, ABS is classified into:

1. One scheme of operation of the ABS system is when all the devices that make up the ABS are located in one unit. That is, the hydraulic valve block, hydraulic accumulator and pump are located in one unit.
2. The second ABS scheme is when the component devices (hydraulic valve block, hydraulic accumulator and pump) are located in different places. In this type of braking system, in addition to the ABS module, there is also an ESP module and an SBC module.

Whether you can bleed the brake system yourself depends on what type of brake system is in your car.

If the car has a system of the first type, then it is easy to properly pump the ABS.

If the car has a system of the second type, then one cannot cope without a scanner; it needs to be pumped to a service center for maintenance.

The ABS system consists of:

• Sensors (installed on the hubs). When replacing rear wheel hubs, as well as some front ones, you may notice special recesses for sensors. They are engaged in transmitting data about the speed of movement.
• Control valves (installed in the brake system). Serve to change the pressure in the system.
• The electronic unit. Receives speed information from sensors and adjusts control valves.

Possible mistakes

In order for the procedure to be effective and not lead to new problems, you should know common mistakes. The most common ones include:

• mixing two different brake fluids;
• reducing the fluid level in the system to critical;
• pressure too high.

If you mix two brake fluids with different parameters, the rubber seals are damaged. The system becomes clogged with clots and stops working.

When the fluid level in the reservoir is too low, air gets into the brake system and it fails. Also, do not use excessive force when pumping. The recommended pressure in the tank is 0.8 atmospheres. If excessive pressure is created, the tank will leak.

ABS bleeding sequence

1. First, we look for and remove the fuse in the fuse block that is responsible for the operation of the anti-lock braking system.
2. Next, we jack up and remove one front wheel, and look for the brake wheel cylinder (BWC) fitting.
3. After this, we put a hose on the fitting (from a hydraulic level, for example).
4. Open the fitting one turn.
5. One presses the brake pedal all the way and holds it in that position.
6. Now turn the ignition key to turn on the hydraulic pump (the ABS indicator lights up on the instrument panel).
7. The second person watches how air is removed through the hose and, after removing the air, tightens the fitting.
8. We release the brake pedal only after tightening the fitting.
9. Now, how do you know that all the air has escaped from the ABS? This shows the ABS icon on the dashboard, if it goes out after removing the air and tightening the fitting, then all the air has escaped.

The correct sequence for bleeding the ABS system

There is a special order for properly bleeding an anti-lock brake system: right front wheel, then rear, then rear right, and then rear left wheel. If during such work the fuel fluid leaks out of the system, it is necessary to fill the system with new fluid. And to do this, you need to know what fluids can be mixed and how much brake fluid is needed to replace.

Sequence of operation for the front wheels:

1. Turn off the ignition (key position “0”).
2. Remove the terminals from the brake fluid reservoir.
3. Take a bottle with a small amount of brake fluid and a hose. We lower one end of the hose into the liquid, put the second on the fitting and open the fitting with an open-end wrench. It is advisable to use a transparent hose from the hydraulic level so that you can see whether air bubbles are coming out or not.
4. Press the brake pedal and hold it in this position.
5. The second person (at the wheel) looks to see if the air is coming out, and after the air bubbles have stopped coming out, he closes the fitting with a key.

How to bleed rear wheels with ABS:

The procedure differs for pumping the rear wheels. After the front wheels, the rear right wheel should be pumped in the following sequence:

1. We also put the hose into the bottle of liquid and into the caliper fitting.
2. Depress the brake pedal all the way.
3. Turn the ignition key to position “2”.
4. Hold the brake pedal until the hydraulic pump completely expels the air bubbles.
5. Close the fitting and release the brake.

For effective bleeding, when working with the brake system of the rear left wheel, the procedure must be adjusted. Namely:

1. As in other cases, put on the hose and unscrew the caliper fitting 1 turn. When pumping with the rear left wheel, the brake does not need to be applied immediately.
2. Turn the ignition key to start the hydraulic pump.
3. After the air comes out, press the brake pedal halfway and close the fitting.
4. Next, release the brake and wait for the hydraulic pump to turn off.
5. Turn off the ignition.
6. We connect the disconnected connector of the brake fluid reservoir (TF).

Step by Step Actions

The nuances of pumping depend directly on the ABS model. The location of individual components and the presence or absence of additional modules affect the order of the procedure.

The preparatory stage is the same regardless of the car brand. Turn off the ignition and press the brake pedal intensely several times.

Pumping using the example of Lada Granta

The car is placed on an overpass or driven into a pit. This is necessary so that you do not have to remove the disks for free access to the working surface. Next, turn on the ignition to open the solenoid valves. Start the procedure with the right rear wheel.

To bleed the brakes you need:

• Disconnect the wires from the tank cap;

• pour brake fluid into the reservoir (as much as will fit);
• remove the cap;
• use a spanner wrench to loosen the tension on the fitting;
• the prepared hose is connected to the tip of the fitting;
• place the second end of the hose in a container for waste liquid;

• press the brake pedal several times;

• fix the pedal in the lowest position and hold it;
• use a key to open the fitting;
• wait until the liquid has completely drained (at this moment the brake pedal will “fall” to the floor);
• close the fitting;
• pump the pedal again and repeat the procedure until the liquid flowing from the hose no longer contains air bubbles;
• tighten the fitting;
• remove the hose;
• reinstall all parts.

The process is repeated on each wheel in order of priority.

Bleeding the brakes of Lada Priora

The process of bleeding the ABS brake system for the Lada Priora is similar to the previous one. When bleeding the front wheels, the discs are removed, providing better access to the working surface.

After completing the process, you should not immediately drive out onto the road. First, they check the functionality of the system in a safe area, eliminating leaks and failures of the pedal.

Conclusion

After carrying out repair and maintenance work on critical components of the car, before driving, you must first check the tightness of the system and the operability of the vehicle components.

ABS - Anti-lock Braking System is a system against wheel locking during heavy braking. Thanks to the fact that ABS prevents the car from skidding along the road, safety increases in emergency situations. The anti-lock braking system will operate correctly if the system is not air-filled.

Watch this helpful video. Tests show that even a working ABS system turns off at the end of the braking distance, so you still need to modify it with your foot.

How to bleed brakes with ABS without the help of others

Have a nice day, dear car owners! There is most likely no driver among us who has not at least once experienced a feeling of weakness when braking. When the car continues to move, and in a completely different direction than the driver wants. Skid.

Fortunately, the engineering idea does not stand still. The modern driver is armed with a system such as Abs. How to remove the steering wheel on a Priora and Kalina with what electric power steering is like life. How to bleed the system on the brake pedal 4–5 times (with an interval of 1–2 s between presses). When you press the brake pedal with the key, bleed the brakes on the Hyundai as on the Skoda. Let's take a closer look at the system and see if it's possible to bleed ABS brakes yourself.

Features of work on models starting from VAZ-2108

Now let’s look at the specifics of the operation on other cars of the VAZ family. Starting with model 2108, the circuit diagram has changed, and therefore the sequence is somewhat different. And you need to know it before bleeding the brakes on the VAZ-2108, 2109, 21099.

These cars already use a diagonal arrangement of contours. That is, one of them combines the rear left and front right wheels, and the second - the other two.

Bleeding begins, as usual, from the farthest wheel, that is, from the rear right one. An operation to remove air from its brake mechanism is carried out according to the described sequence.

But there is one caveat. The design includes a pressure regulator for the rear wheel drive mechanisms. If the rear of the car is hung out before bleeding, this regulator must be unlocked. To do this, just install a screwdriver between the regulator rod and the thrust plate.

After all work it should be removed.

Then it is pumped to the second rear wheel, and the front left one, since it is the one that is combined with the circuit with the already pumped rear mechanism.

After pumping each mechanism, it is necessary to check the level in the tank. If you omit this point, then during operation the liquid will go into the system and air will enter it again.

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 ABS is to regulate the speed of rotation of all wheels. This is done by changing the pressure in the car's brake system. The process occurs using signals (pulses) from each wheel sensor that enter the ABS control unit.

See:

How the anti-lock braking system works

The contact patch of the car's wheels is relatively stationary to the road surface. To remove air from the system, it is necessary to bleed the brakes. From the brake pedal. Threshold covers are installed for the purpose of protection. As we can see, remove the threshold and replace it. 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, ABS effectively slows down the rotation of the wheels at a speed that corresponds to the speed of the car at the moment of braking.

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

Anti-lock braking system device

Here are the main components of ABS:

• sensors installed on the wheel hubs of a 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. To ensure effective and safe braking in the grant with external brakes on. Its task is to receive signals from sensors and control the operation of valves.

How to fill brake fluid correctly

The brake reagent on the Lada Granta should be replaced after every 45 thousand kilometers traveled or after 2-3 years of use. It should be said that the replacement can be done with your own hands.

It must be said right away that the reagent is replaced on Grant, which is initially installed on the overpass. First you need to unscrew the cap from the neck of the tank to fill the liquid. Then the spent working fluid is pumped out. This is best done with a syringe or rubber bulb. Only after this is the previously unused brake fluid poured into the container.

During the process of filling brake fluid, you need to be as careful as possible and take special care. If liquid gets on painted surfaces, it will need to be cleaned up quickly as it may damage the paintwork. Then the hydraulic drive is pumped, through which the brake fluid flows.

Pumping is carried out until the moment when a liquid lighter than the used liquid comes out of the fittings on all pumped working cylinders. Bleeding is carried out with the engine turned off, first on one circuit, and then on the other.

The replacement procedure is as follows:

• The first to bleed is the brake system located on the right side of the rear wheel.
• Then the left front wheel mechanism is cleaned of the spent reagent.
• Next comes the turn of the left rear wheel system.
• The pumping mechanism ends with the right front wheel.

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

Bleeding an ABS brake system In addition, it will not be superfluous to first study the manual on the design and maintenance of the brake system of your car.

Features of bleeding brakes with ABS

• in cars that have a hydraulic valve block, a hydraulic accumulator and a pump in one unit, replacing the brake fluid and bleeding the brake system with an anti-lock braking system is carried out in the same way as bleeding the brakes on a car without ABS, you need to turn off the system by removing the fuse. Bleeding of the circuits is carried out with the brake pedal pressed, the RTC bleeder fitting must be unscrewed. How to properly bleed the brakes on a Lada V. 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 light is evidence that your actions were correct.
• Bleeding 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 retrieve information from the ABS ECU. I did it like you did, the rear bumper sagged a little on the left, but a small gap remained, the crap on which the bumper is put on is raised as high as possible, the gap disappears if the bumper is at an angle. It's unlikely you have one. Therefore, bleeding of brakes with ABS of this type should most likely be done by you at a service station.
• Bleeding the brake system with ABS and electronic activation systems (ESP or SBC) is carried out only under service conditions.

Tools

But it is important to know how to properly bleed the brakes on VAZs of different models and what is required for this. The operation itself is not complicated, so you can do it yourself. But it’s better to do this with an assistant - it will be both faster and easier.

Not many tools are required:

• Key for 8 (10);
• Silicone transparent tube according to the diameter of the fitting;
• Capacity;
• Brake fluid;

As for the wrench, you should use the cap type. There are also special keys on the market for unscrewing fittings, clamping. The fact is that the fittings often stick to the thread and are very difficult to unscrew. Using a regular open-end tool, you can easily “lick” the edges and then it will be completely impossible to unscrew the fitting.

The essence of pumping work is almost the same for all cars - VAZ-2101, VAZ-21099, and VAZ-2121 Niva. But the sequence of operations is affected only by the design features of the models.

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 on any system with ABS, it is necessary to discharge the pressure accumulator. On a car like the one in the field, the rear shock absorber is from the top. To do this, with the ignition off, press the brake pedal 20 times.

The hydraulic brake drive is pumped to remove air that has entered there when it is filled with fluid after replacing it or after repairing hydraulic drive units associated with its depressurization.

Signs of air in the brake system of a VAZ 2190

1. Increase in pedal travel, its “softness” when you press the pedal once.

2. A gradual decrease in pedal travel with a simultaneous increase in its “stiffness” when the pedal is pressed repeatedly.

Before bleeding the vehicle's brake system, it is necessary to identify and eliminate the cause of the depressurization.

Bleeding the brake system of Lada Granta

Helpful advice:

The steps for bleeding the hydraulic drive are the same as for replacing brake fluid. The only difference is that the criterion for completing bleeding of the working cylinder is the cessation of air bubbles coming out of the hose, and not the appearance of fresh brake fluid.

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A little theory

To transmit force, one of the properties of the fluid is used - its incompressibility. That is, when a force is created on a liquid, its volume does not change, and it acts as a transmitter.

A hydraulic brake drive is more practical than a mechanical or pneumatic one, but it has one drawback - if air gets into the fluid, the transmission of force will be significantly reduced. This is because air, like any gas, is compressible. As a result, the presence of air leads to a change in the volume of the liquid when creating force (due to gas compression). Because of this, the force is no longer transmitted to the actuators, since it is absorbed by the volume change.

It turns out that effective operation of the brakes on a VAZ occurs only until air enters the drive system. And this can happen for several reasons.