Is there abs on the grant? Grant rear brake pad replacement step by step

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.

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 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 retrieve 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 disconnecting the brake lines on 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 brake fluid starts to come out without air bubbles, close the fitting and release the brake.

Rear left wheel brake

The ABS of the vehicle's braking system is designed to automatically control the degree of wheel slip in the direction of their rotation during braking by changing the loss of controllability and stability of the vehicle and increasing the braking efficiency.

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 full control of the machine during emergency braking, but does not reduce the stopping distance.

Therefore, you need to keep the correct distance.

On vehicles with an installed ABS system, a four-channel system is used.

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 hydromodulator is controlled by an electronic unit installed on the hydromodulator.

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

Wheel speed sensors are installed in the front and rear brakes.

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 control 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 install the car on a lift or inspection ditch.

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.

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 the rear brake will be regulated by the part of the regulator, which includes the piston 2 with the seal 21 and the sleeve 7. The operation of this part of the brake regulator in the event of a failure of the named circuit is similar to the operation with a working 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 is shifted 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 of the 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. Attached to the brake master cylinder brake reservoir, in the cover of which the sensor of the emergency level of the brake fluid 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 stopping support 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 Lada Granta car has a brake system (pipelines, brake cylinders, vacuum booster, brake regulator, brake pads, etc.) similar to the Lada Kalina car.
For effective and safe braking, Lada Granta uses a diagonal, dual-circuit piping system, which means that the first circuit blocks the wheels - the right front and left rear, and the second circuit - the left front and right rear. The front wheels are equipped with disc brakes, the rear wheels are equipped with drum brakes.
The master brake cylinder is controlled through a vacuum brake booster, which increases the efficiency of operating the brake system by pressing the brake pedal.
Depending on the configuration of the car Lada Granta brake system can be equipped with an anti-lock braking system (ABS).
The Lada Granta car has a hand brake that blocks rear wheels(spreads the brake pads in the drums). The pads are bred through a system of levers, by moving a steel cable fixed to a lever located in the passenger compartment.
The vacuum booster on a Lada Grant car (shown in Fig. 1) is of a diaphragm type. The diaphragm is a separating partition between the rarefied atmosphere created in the vacuum amplifier and the external atmospheric pressure. The pressure difference reduces the force on the brake pedal. When the brake pedal is released, the vacuum and atmospheric chambers communicate with each other through a special valve.

Rice. 1. Scheme hydraulic system brakes Lada Granta (without ABS): 1, 25 - brake mechanisms of the right front and left front wheel; 2, 24 - brake hose for supplying brake fluid to the right and left front wheels; 3,4, 15, 18, 21, 5,10,13,22,27 - pipelines of the hydraulic brake system; 6 - plastic reservoir of the brake master cylinder; 7 - the main cylinder of the hydraulic drive of the brakes; 8 - vacuum amplifier; 9, 30 - pipe holders; 11 - flexible hose of the brake mechanism of the right rear wheels but; 12, 17- brake mechanism of the right rear wheel; 14, 31 - brackets for fastening flexible hoses; 16- flexible hose of the brake mechanism of the left rear wheel; 19 - elastic lever drive pressure regulator; 20 - pressure regulator; 23 - brake pedal; 24 - flexible brake mechanism of the left front wheel; 26 - circuit tee right front - left rear brake; 28 - circuit tee left front - right rear brake; 29 - tee mounting bolts

Features of the Lada Grant braking system with ABS are shown in Figure 2.

Fig. 2. Scheme of the Lada Grant hydraulic brake drive (with anti-lock braking system): 1, 14, 22 - brackets for fastening flexible hoses; 2 - brake mechanism of the right front wheel; 3 - flexible hose of the brake mechanism of the right front wheel; 4, 5, 15, 18, 26 - pipelines of the circuit right front - left rear brake; 6, 10, 13, 27, 28 - circuit pipelines left front - right rear brake; 7 - plastic tank of the main brake cylinder; 8-vacuum amplifier; 9, 24 - pipe holders; 11 - flexible hose of the brake mechanism of the right rear wheel; 12 - brake mechanism of the rear wheel; 16 - brake mechanism of the rear left wheel; 17 - flexible hose of the brake mechanism of the left rear wheel: 19 - brake pedal; 20-brake mechanism of the left front wheel; 21 - flexible hose of the brake mechanism of the left front wheel; 23 - the main cylinder of the hydraulic drive of the brakes; 25 - ABS hydroelectronic module

Rice. 3. Vacuum booster of the car Lada Granta: 1 - flange for fastening the tip; 2 - stock; 3 - diaphragm return spring; 4 - sealing ring of the flange of the main cylinder; 5 - main njhvjpyjq cylinder; 6 - amplifier pin; 7 - amplifier housing; 8 - diaphragm; 9 - amplifier housing cover; 10 - piston; 11 - protective cover of the valve body; 12-pusher; 13- pusher return spring; 14-valve spring; 15 - valve; 16 - stock buffer; 17- valve body; A - vacuum chamber; B - atmospheric chamber; С, D - channels
Information on the principles of operation of the Lada Grant brake system components, in particular the master brake cylinder and pressure regulator (the pressure regulator is installed only on cars without ABS) can be found in the article "Design features of the brake system of a Lada Priora car", the design of the nodes is similar.

Malfunction of wheel, brake cylinders can manifest itself as follows:
- in the passage of brake fluid through the seals on the piston, while you can notice streaks around the perimeter of the mudguard. Leakage of brake fluid from a plastic reservoir located in the engine compartment;
- it is also possible to jam the pistons in the cylinder. Usually jamming occurs in the advanced position of the pistons. At the same time, the pads wear out, the wheel slows down, the car rolls poorly due to inertia, without engaging any gear.
In both cases, the brake cylinder on a Lada Grant car must be replaced.

This article describes the operations for removing the brake cylinder, removing the brake assembly together with the brake cylinder, and the algorithm for removing the brake disc, for its revision, turning or replacement.
To carry out the operation, you will need: a 12, 13, 17 mm wrench, a flat-blade screwdriver, a hex wrench.

The front and rear brake pads can be used up to a pad thickness of at least 1.5 mm, this is their smallest value (the value of at least 1.5 mm is the same for the front and rear pads). With a smaller value of the linings on the Lada Grant brake pads, it is possible for the rubber sealing rings installed on the piston to exit the seal field located on the cylinder cavity into brake mechanism. Depressurization of the seal will cause the passage of brake fluid into the external environment and lead to breakdown and inefficient operation of the vehicle's brakes.
In order to be guaranteed to change the old pads to new ones, change them without waiting for wear of 1.5 mm. Enough to replace 5 - 7 mm. The fact is that during prolonged operation in the limit position of the piston, previously working sealing surfaces can become clogged with deposits, which will not allow the piston to return to its original working position in the brake cylinder, to a position corresponding to the thickness of new brake pads.
When replacing pads, only replace them as a complete set on both sides. This will allow you to avoid the difference in braking when braking and, accordingly, the car pulling to the side.

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 unscrewed, you will need to loosen the handbrake cable and remove the cotter pin that holds the shoe. Then the lever, springs and brake pads are dismantled.

When carrying out the last processes, you need to ensure that the brake fluid does not leak. 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 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.

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