Despite all the efforts of engineers who equip new cars with a wide variety of active driving assistance systems, many car owners do not like the work of some of them. Most drivers complain about the anti-lock braking system. It is designed to prevent the wheels from completely locking up when the car is braking, which helps to avoid loss of vehicle control and shorten the braking distance.

ABS is especially convenient for inexperienced drivers, but it has one feature - the ability to shorten the braking distance is maintained only on a flat surface. If the road is dirty, bumpy, snowy, the presence of ABS not only does not help to slow down in time, but can also lead to an increase in the braking distance. Therefore, the question becomes quite relevant for the driver - is it possible and how to turn off the ABS on the car. It can be done, but not as easy as it might seem.

Is it possible to turn off the ABS without negative consequences

It should be noted right away that if it is incorrect to disable the factory-installed system, on-board computer will record the fact of outside interference, which can lead to unnecessary questions during Maintenance. If you have to contact the service under warranty, the fact that the ABS is turned off on its own may well become the reason for the refusal of the warranty, and, accordingly, free repair.

To temporarily disable the ABS, you can use the following algorithm of actions.

1. Open mounting block fuse located next to the battery. In most vehicles, you will have to remove the 15 amp fuse to disable the ABS, but it is best to check with your vehicle owner's manual before doing so.
2. After that, to check, briefly turn on the ignition - the brake and ABS lights should not go out, in addition, an audible signal will sound. The ignition is switched off.
3. The mounting block itself is unscrewed, its bottom cover is removed.
4. You will need to find the wire leading to the already removed fuse, cut it along and strip the ends by 1.5-2 cm.
5. Before starting work, you need to purchase the simplest five-pin relay in a car dealership.

Before connecting, you should look at the pin diagram located on the case. Work should begin with contacts 85 and 86 going to the winding. A wire is connected to them, leading to ground, and the second will serve to supply a control signal from the ignition switch through the ABS off toggle switch. Contact number 30 is connected to the wire extending from the fuse, and the 88th is connected to the ABS. It is convenient to do this with pre-prepared wires, on one side crimped with the “mother” terminal. Subsequently, they will need to be installed in an empty relay block, and the off button is mounted anywhere in the cabin. How this is done in practice, and what are the impressions of the driver after that, you can see on the video:

Temporary blocking of the anti-lock braking system

If you do not want to perform all of the above actions, and the car is operated exclusively on hard and even surfaces, disabling the ABS may not be necessary. Before disabling the ABS in the manner described above, you should be aware that under normal conditions, it can actually shorten the braking distance, leaving control of the vehicle to the driver. In addition, knowing some of the subtleties of management, you can emergency just block its work without first disabling it.

A fairly common situation when the anti-lock braking system prevents the car from stopping quickly is the need for emergency braking on a slippery, snowy road when an obstacle suddenly appears. In this case, when pressing the brake pedal does not lead to the desired result, and there is no time to turn off the system with the button, you should sharply pull the hand brake, blocking the rear wheels of the car. With this behavior of the driver, the system will allow you to fully depress the brake pedal, and it will turn out to stop the car much faster. Thus, the question of whether it is possible to turn off the ABS should be accompanied by another one - is it necessary to do this, but each driver has to decide on his own.

With a further increase in the effort on the brake pedal, the pressure in the chambers D, IN And BUT increases, the piston 2 continues to move out of the body, and the sleeve 19, together with the sealing collars 10 and the plate 11, under increasing pressure in the chamber IN shifts towards plug 16. Gap M starts to decrease. By reducing the volume of the chamber FROM the pressure in it, and hence in the brake drive, increases and will practically be equal to the pressure in the chamber IN. When the gap TO becomes zero, the pressure in the chamber IN, and hence in the chamber FROM will increase to a lesser extent than the pressure in the chamber BUT, due to the throttling of the brake fluid between the piston head and the seal 21. The relationship between the pressure values ​​in the chambers IN And BUT is determined by the ratio of the difference between the areas of the head and the piston rod to the area of ​​the head.
With an increase in the load of the Lada Grant car, the elastic lever 10 (see Fig. 9.3) is loaded more and the force from the lever 5 on the piston increases, i.e. the moment of contact between the piston head and the seal 21 (see Fig. 9.4) is achieved with a higher pressure in the main brake cylinder. Thus, the effectiveness of the rear brakes increases with increasing load.
In the event of a brake circuit failure, the left front - right rear sealing collars 10 and sleeve 19 are under fluid pressure in the chamber IN will move towards the plug 16 until the plate 11 stops in the seat 14. The pressure in rear brake will be regulated by the part of the regulator, which includes piston 2 with a seal 21 and bushing 7. The operation of this part of the brake regulator in the event of a failure of the named circuit is similar to operation in a serviceable brake system. The nature of the change in pressure at the outlet of the brake regulator is the same as with a working brake system.
In case of failure of the brake circuit, the right front - left rear, under the pressure of the brake fluid, the pusher 20 with the sleeve 19 and the sealing collars 10 moves towards the piston, pushing it out of the housing. Gap M increases, and the gap H decreases. When the valve 18 touches the seat 14, the pressure increase in the chamber FROM stops, i.e. The brake pressure regulator in this case works as a pressure limiter. However, the achieved pressure value is sufficient for reliable operation rear brake.
In case 1, a hole is made, closed by plug 24. Leakage of brake fluid from under the plug when it is squeezed out indicates leakage of cuffs 10.
Master brake cylinder(Fig. 9.5) two-section, with a sequential arrangement of pistons. On the body of the main brake cylinder a brake reservoir is fixed, in the lid of which a brake fluid emergency level sensor is installed.
Brake mechanism front wheel but disk, with automatic adjustment of the gap between the brake pads and the brake disc, with a floating caliper and lining wear sensor brake pads. The bracket is formed by a brake caliper 8 (Fig. 9.6) and a working brake cylinder 3, which are bolted together. The movable bracket is bolted to the pins 4 installed in the holes of the guide 9 of the brake shoes. These holes are lubricated, rubber boots 5 are installed between the fingers and the brake shoe guide. Brake shoes 7 are pressed against the grooves of the guide by springs.
A piston with a sealing collar is installed in the cavity of the brake cylinder. Due to the elasticity of this cuff, an optimal clearance between the brake pads and the brake disc is maintained.
When braking, the piston, under the influence of brake fluid pressure, presses the inner brake pad against the brake disc, as a result of the reaction force, the brake caliper moves on the fingers and the outer brake pad is also pressed against the brake disc, while the pressing forces of the brake pads are the same. When releasing the piston, due to the elasticity of the sealing collar, it is retracted from the brake pad, a small gap is formed between the brake pads and the brake disc.

The principle of operation of the system is simple: receiving data from the speed sensors of all wheels and from the vehicle speed sensor, the control unit controls the rotation of each wheel and, in the event of a wheel locking during braking, reduces the pressure in the corresponding brake circuit.

The ABS system provides complete controllability of the machine when emergency braking, but does not reduce the braking distance.

Therefore, you need to keep the correct distance.

On vehicles with installed system ABS uses a four-channel system.

The channels are connected diagonally.

The executive element of the anti-lock braking system is a hydraulic modulator. This is a complex assembly in which a hydraulic pump and solenoid valves are built.

It is installed in the engine compartment.

The operation of the hydraulic modulator is controlled by the electronic unit installed on the hydraulic modulator.

The control unit also monitors the health of all elements of the ABS system.

Wheel speed sensors are installed in the front and rear brake mechanisms.

Inductive sensors

For the operation of sensors installed in the front brake mechanisms, gear rims are made on the housings of the outer hinges of the front wheel drives.

For the operation of the sensors, master discs are installed in the rear mechanisms under the brake drums.

Rice. 4. Speed ​​sensor rear wheels but

Pulse signals from the sensors are sent to the control unit.

When one of the wheels is blocked, the hydraulic modulator, at the command of the control unit, limits the pressure in the corresponding channel.

If a malfunction is detected, the control unit informs the driver using a warning lamp on the instrument panel.

You can determine the problem by the fault codes.

An ABS failure can be caused by a failure of the wheel speed sensors or by a failure of the hydraulic valve block itself.

If the ABS fails, the braking system is maintained, but the braking efficiency is reduced.

Removing the ABS hydraulic unit

We remove the battery.

Disconnect the plug-in block of wires from the hydraulic unit.

Disconnect brake pipes, going to the brake mechanisms from the hydraulic unit of the anti-lock braking system. We install plugs on the pipes and holes in the hydraulic unit.

We disconnect the tubes of the primary and secondary circuits of the master cylinder from the ABS hydraulic unit.

Using a 13 head, unscrew the two bolts securing the hydraulic unit bracket to the front side member.

We remove the hydraulic unit with the bracket assembly.

Using a 10 key, unscrew the hydraulic unit from the bracket.

Installation of a hydraulic unit

We install the hydraulic unit on the bracket and fix it with nuts. Nut tightening torque 7 - 10 Nm.

We install the hydraulic unit with the bracket assembly on the car body and tighten two bolts with washers securing the hydraulic unit to the left side member.

We remove the plugs and attach the tubes to the ABS hydraulic unit. The tightening torque of the pipe fittings is 15 - 18 Nm.

Attach the plug. We install the battery. Bleeding the brake system.

Removal and installation of the sensor and rotor ABS front wheels

We install the car on a lift or inspection ditch.

Disconnect the speed sensor harness front wheel from the front wiring harness.

We remove the sensor harness from the brackets on the front suspension strut and the car body.

Using a TORX E8 head, unscrew the bolt securing the speed sensor to the bracket on knuckle and remove the sensor.

Installing the front wheel speed sensor

Before installation, apply AZMOL LSTs-15 grease to the mating holes. Install the sensor in reverse order. The tightening torque of the sensor mounting bolt is 6 - 9 Nm (0.6 - 0.9 kgcm).

If it is necessary to replace the front wheel ABS rotor, then we replace the drive assembly: (right front wheel drive part 11180-2215010-10, left front wheel drive part 21700-2215011-00) or outer joint assembly (part 11186-2215012 -00).

Removing the speed sensor and rear wheel rotor Lada Granta

We install the car on a lift or a viewing hole.

Disconnect the rear wheel speed sensor harness connector from the wiring harness.

Using a flat screwdriver, remove the speed sensor harness connector from the hole in the car body.

Remove the rear wheel speed sensor harness from the mounting brackets located on the levers. rear suspension and car body.

Using the TORX E8 head, unscrew the bolt securing the speed sensor to the bracket.

Remove the rear wheel speed sensor.

Before installing the speed sensor, lubricate the mating parts with grease.

The tightening torque of the sensor mounting bolt is 6 - 9 Nm.

Removing the rear wheel rotor

Put the car on a lift and remove the rear wheel.

With a head of 7, we unscrew the guide pins for fastening the drum.

We insert the pins into the threaded holes of the brake drum and screw the pins in sequence. Thus, compressing brake drum.

Removing the brake drum

Removing the rear wheel

In the rear block of the car with ABS system hole that the tip of the speed sensor goes into

Installation

We apply grease to the seat belt of the hub, install the brake drum and wrap the guide pins. The tightening torque of the pins is 7 - 15 Nm. Installing the wheel.

The Lada brake system is responsible for the safety of the driver and passengers. vehicle so it needs to be checked regularly. Serviceability of brake pads should be checked at least once a month.

Design of the braking system Grants

brake pads

Before proceeding with the adjustment and verification, you should find out what the Lada brake system is, what are its features. The design includes the following parts:

• brake regulator;
• pipelines;
• brake pads and cylinders;
• amplifier.

To ensure efficient and safe braking, the Grant has a dual-circuit (diagonal) piping system. The tasks of the first circuit include blocking the left rear and right front wheels. The second circuit is designed to block the left front and right rear wheels. The front wheels have disc brakes and the rear wheels have drum brakes.

The master cylinder control process on the Lada Granta is carried out by vacuum booster. This device is designed to improve the controllability of the brake system. To do this, you need to press the appropriate pedal. It should be noted that the anti-lock braking system may be included in the Lada Grant package or the ABS will be absent.
The Lada Grant system under consideration is equipped with a hand brake that blocks the rear wheels due to the separation of the corresponding pads in the drums. These parts are bred through levers and by moving a steel cable located in the vehicle interior.

The vacuum amplifier is a diaphragm. This element separates the rarefied atmosphere of the vacuum booster from the external pressure. The pressure difference helps to reduce the effort exerted on the respective pedals. If the brakes are released, the atmospheric and vacuum chambers are connected to each other using a special valve.

Checking and bleeding the brakes

Bleeding the brakes

To check the brakes on the Lada Granta, you need a jack. It raises the rear of the car. Then the wheels are removed. The next step involves dismantling the drum. If the guide pins are loose, the cable will need to be loosened. hand brake and remove the cotter pin that holds the block. Then the lever, springs and brake pads are dismantled.

When carrying out the last processes, it is necessary to ensure that brake fluid did not flow. To do this, auto mechanics recommend disconnecting a special tube designed to supply this substance to the cylinder. Thus, the access of the brake mixture to the outside will be blocked. Then remove the corresponding cylinder. Installing the dismantled parts is carried out in the reverse order. In this case, it will be necessary to lubricate each unit with a special graphite grease.

The brake system of any vehicle needs pumping. This process is carried out after each repair of the brakes. It should be noted that it is difficult to do this work alone. Therefore, auto mechanics are advised to involve an assistant in bleeding the brakes. Someone must be in the car, pressing the appropriate pedal 5 times until it stops at the bottom. The second participant in the process, using a key, loosens the screw located near the brake disc. This unit is designed to drain liquid. When loosening the screw, press the brake pedal. If it rises, the screw is twisted. This operation is done several times.

If liquid appears at the outlet instead of air, the pumping process is performed correctly. The main thing is that the substance comes out without air bubbles. The final stage is the installation of the wheels in their original places. To check the operation, you will need to scroll each wheel by depressing the brake pedal several times. If the drum clings to the pads a little, then the procedure was successful. The front brakes of the Lada are adjusted in a similar way.

How pump brakes with Abs (Abs) alone

Have a good day, dear car owners! Among us, most likely, there is no driver who at least once did not experience a feeling of weakness at the moment of braking. When the car continues to move, and completely in the wrong direction in which the driver wants. Skid.

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

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. To remove air from the system, it is necessary to bleed the brakes. C to the brake pedal. Thresholds 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, 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.

Read also:

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. To ensure efficient and safe braking in a grant with external brakes on. Its task is to receive a signal from sensors and control the operation of valves.

Read also:

Lada Grant. How to bleed the brakes on a Lada Grant? How to bleed brakes on how to bleed brakes with abs ;. Brake system

Bleeding VAZ brakes

Video review of bleeding the brakes using the example of a VAZ 2115 car. How to pump brakes with abs? Bleeding brakes with abs, as well as bleeding on the brake pedal. Let's talk about the nuances that arise during pumping.

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

pumping brake system with ABS 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 vehicles that have in one unit: 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 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 depressed, the RTC bleeder must be unscrewed. How to bleed the brakes on fret 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 lamp is evidence of the correctness of your actions.
• Bleeding the brake system with ABS, in which the hydraulic module with valves and the hydraulic accumulator are spaced apart individual nodes, is carried out using a diagnostic scanner to read information from the ABS computer. I did it like you did, sagged a little rear bumper from the left, but a small gap remained a little, the crap on which the bumper is put on is raised as high as possible, the gap disappears if the bumper seems to be from the corner. 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 exclude the emission brake fluid, before disconnection brake lines for any system with ABS, it is necessary to discharge the pressure accumulator. On such a car, as in a field with their own rear shock absorber from the top. To do this, with the ignition off, press the brake pedal 20 times.

Front wheel brakes:

• put the hose on the bleeder fitting;
• open the fitting for a turn;
• pedal brakes squeezed out to the stop and held in the squeezed 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". How to bleed brakes with abs audi a4, a6, trade wind b5. Wherein brake pedal held down;
• a running pump will force air out of the system. How to remove the battery from ford mondeo» battery for ford. 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