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 in Lada Granta, a diagonal, two-circuit pipeline system is used, 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. Disc brakes are installed on the front wheels, drum brakes are installed on the rear wheels.
The brake master cylinder is controlled by a vacuum brake booster, which increases the efficiency of the braking system by pressing the brake pedal.
Depending on the configuration of the Lada Granta car, the braking system can be equipped with an anti-lock braking system (ABS).
The Lada Granta car has a hand brake that locks the rear wheels (dilutes the brake pads in the drums). The pads are spread through a system of levers by moving a steel cable fixed to the lever located in the passenger compartment.
The vacuum amplifier on the Lada Granta car (shown in Fig. 1) is of the diaphragm type. The diaphragm is a dividing wall between the rarefied atmosphere created in the vacuum amplifier and external atmospheric pressure. The differential pressure reduces the effort on the brake pedal. When the brake pedal is released, the vacuum and atmospheric chambers communicate with each other through a special valve.
Figure: 1. Diagram of the hydraulic system of the Lada Granta brakes (without ABS): 1, 25 - brakes of the right front and left front wheels; 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 -pipes of the hydraulic brake system; 6 - plastic reservoir of the main brake cylinder; 7 - the main cylinder of the hydraulic brake; 8 - vacuum amplifier; 9, 30 - pipe holders; 11 - flexible hose of the brake mechanism of the right rear wheel; 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 of the pressure regulator drive; 20 - pressure regulator; 23 - brake pedal; 24 - flexible brake mechanism of the left front wheel; 26 - tee of the contour right front - left rear brakes; 28 - tee of the contour left front - right rear brakes; 29 - tees fastening bolts
Features of the Lada Granta braking system with ABS are shown in Figure 2.
2. Diagram of the hydraulic drive of the Lada Granta brakes (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 - right front - left rear brake circuits; 6, 10, 13, 27, 28 - left front - right rear brake circuits; 7 - plastic reservoir of the master brake cylinder; 8-vacuum amplifier; 9, 24 - pipe holders; 11 - flexible hose of the brake mechanism of the right rear wheel; 12 - rear wheel brake; 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
Figure: 3. Vacuum amplifier of the Lada Granta car: 1 - tip mounting flange; 2 - stock; 3 - a returnable spring of the diaphragm; 4 - O-ring of the master cylinder flange; 5 - the main njhvjpyjq cylinder; 6 - amplifier hairpin; 7 - amplifier case; 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 Granta brake system units, in particular the brake master cylinder and the pressure regulator (the pressure regulator is installed only on cars without ABS), can be found in the article "Features of the Lada Priora car brake system design", the design of the units is similar.
Malfunction of wheel, brake cylinders can manifest itself as follows:
- in passing the brake fluid through the seals on the piston, while you can notice drips around the perimeter of the mud guard. Leakage of brake fluid from a plastic reservoir located in the engine compartment;
- jamming of pistons in the cylinder is also possible. Typically, seizure occurs in the extended position of the pistons. In this case, the pads wear out, the wheel slows down, the car rolls poorly by inertia, without turning on any gear.
In both cases, the brake cylinder on the Lada Granta 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, grooving or replacement.
To carry out the operation, you need: a 12, 13, 17 mm wrench, a flat-blade screwdriver, a hex wrench.
Front and rear brake pads can be operated up to a lining thickness of at least 1.5 mm, this is their smallest value (at least 1.5 mm is the same for the front and rear pads). With a smaller value of the linings on the Lada Granta brake pads, it is possible for the rubber sealing rings installed on the piston to leave the seal field located on the cylinder cavity in the brake mechanism. Depressurization of the seal will entail the passage of brake fluid into the external environment and lead to breakdown and ineffective operation of the car brakes.
In order to be guaranteed to replace old pads with new ones, change them without waiting for 1.5 mm wear. Enough to replace 5 - 7 mm. The fact is that during prolonged operation in the limiting position of the piston, the 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 the new brake pads.
When replacing the pads, replace them only complete on both sides. This will allow you to avoid the difference in seizure when braking and, accordingly, the vehicle to slip to the side.
Brake system - this is such a car system, thanks to which you can control the deceleration or reduction of speed, up to a full stop, and also avoid movement or rolling when the car is parked.
The braking system of a Lada Granta car includes such elements as brake pads, brake cylinders, brake hoses and pipelines, a vacuum brake booster, a brake force distributor, a master brake cylinder, etc.
Braking system Grants in many respects repeats such a car Lada Kalina. The system is dual-circuit. This means that the 2 circuits work independently of each other. That is, if the tightness of one circuit is lost, the second one remains working. That is why the left and right sides of the car are included in one circuit. For safer braking, in the event of failure of one of the brake circuits, the right and left sides must brake equally. This is achieved due to the connection in one circuit of pairs of wheels: left front - right rear; right front - left back.
For more effective and comfortable braking on the Lada Grant car, a vacuum brake booster (VUT) is used. It increases the force applied to the brake pedal several times. It should be noted that the VUT is operational only when the engine is running. Therefore, you should not turn off the ignition of a car when coasting down a hill - you will get the feeling that the brakes are gone.
Lada Granta brake hydraulic circuit (version without ABS)
The hydraulic circuit of the Lada Granta brakes with the ABS system
In this section you can find a description of how to replace brake pads, hoses, and the operation of the vacuum brake cylinder.
The Lada brake system is responsible for the safety of the driver and passengers of the vehicle, so it needs to be checked regularly. The serviceability of the brake pads should be checked at least once a month.
Braking system design Grants
Brake linings
Before proceeding with the adjustment and inspection, you should find out what the Lada brake system is, what are its features. The design includes the following details:
- brake regulator;
- pipelines;
- brake pads and cylinders;
- amplifier.
To ensure effective and safe braking, the Grant provides for a two-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 control process of the master cylinder on the Lada Granta is carried out by a vacuum amplifier. This device is designed to increase the controllability of the brake system. To do this, you need to press the corresponding 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 Granta system under consideration is equipped with a hand brake that blocks the rear wheels by spreading the corresponding pads in the drums. These parts are parted through levers and by moving a steel cable located in the vehicle interior.
The vacuum amplifier is a diaphragm. This element separates the vacuum amplifier's vacuum atmosphere with external pressure. The differential pressure 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 lifts the rear of the vehicle. Then remove the wheels. 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, it is necessary to ensure that the brake fluid does not leak. To do this, auto mechanics recommend disconnecting a special tube designed to feed this substance into the cylinder. Thus, access to the outside of the brake mixture will be blocked. Then remove the corresponding cylinder. The dismantled parts are installed in the reverse order. In this case, it will be necessary to lubricate each unit with a special graphite grease.
The braking system of any vehicle needs pumping. This process is carried out after each brake repair. It should be noted that it is difficult to do this work alone. Therefore, auto mechanics advise to involve an assistant to pumping the brakes. Someone should be in the car, pressing the corresponding pedal 5 times until it stops in the bottom. The second participant in the process uses a wrench to loosen the screw located near the brake disc. This unit is designed to drain fluid. When unscrewing the screw, press the brake pedal. If it rises, the screw is tightened. This operation is performed several times.
If liquid appears instead of air at the outlet, the pumping process is performed correctly. The main thing is that the substance comes out without air bubbles. The final stage is to install the wheels in their original places. To test the operation, you will need to rotate each wheel by pressing the brake pedal several times. If the drum clings a little to the pads, then the procedure was successful. The front brakes of the Lada are regulated in a similar way.
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 blocking 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 lead to a decrease in the braking distance.
Therefore, you need to maintain the correct distance.
On vehicles with an ABS system installed, a four-channel system is used.
The channels are connected diagonally.
The actuator of the anti-lock braking system is a hydromodulator. It is a complex assembly with a built-in hydraulic pump and solenoid valves.
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.
Inductive sensors
For the operation of the sensors installed in the front brakes, gear rims are made on the housings of the outer hinges of the front wheel drives.
For the sensors to work, driving discs are installed in the rear mechanisms under the brake drums.
Figure: 4. Rear wheel speed sensor
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.
The problem can be identified by the fault codes.
A malfunctioning ABS can be caused by a failure of the wheel rotation sensors or a malfunction of the hydraulic valve block itself.
If the ABS fails, the braking system remains operational, but the braking efficiency decreases.
Removing the ABS hydraulic unit
We remove the battery.
Disconnect the plug-in connector from the hydraulic unit.
Disconnect the brake pipes going to the brake mechanisms from the anti-lock braking system hydraulic unit. We install plugs on pipes and holes in the hydraulic unit.
Disconnect the tubes of the primary and secondary circuits of the master cylinder from the ABS hydraulic unit.
With a 13 head, unscrew the two bolts securing the bracket of the hydraulic unit to the front spar.
We remove the hydraulic unit with the bracket assembly.
Using a 10 key, unscrew the hydraulic unit from the bracket.
Installation of the hydraulic unit
We install the hydraulic unit on the bracket and fasten it with nuts. Tightening torque for nuts 7 - 10 Nm.
We install the hydraulic unit with the bracket assembly on the car body and tighten the 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. Tightening torque for pipe fittings 15 - 18 Nm.
We attach the plug block. Installing the battery. We pump over the brake system.
Removing and installing the sensor and the ABS rotor of the front wheel
We install the car on a lift or a viewing ditch.
Disconnect the front wheel speed sensor harness block from the front wiring harness.
Remove the sensor harness from the brackets on the front suspension strut and the car body.
Using the TORX E8 head, unscrew the bolt securing the speed sensor to the bracket on the steering knuckle and remove the sensor.
Installing the front wheel speed sensor
Before installation, we apply AZMOL LSC-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 ABS rotor of the front wheel, then we replace the drive assembly: (drive of the right front wheel, part 11180-2215010-10, drive of the left front wheel, part 21700-2215011-00) or external hinge 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 holder for the speed sensor harness block from the hole in the car body.
Remove the rear wheel speed sensor harness from the brackets located on the rear suspension arms and the vehicle body.
Use the TORX E8 head to unscrew the bolt securing the speed sensor to the bracket.
Remove the rear wheel speed sensor.
Before installing the speed sensor, grease the mating parts with grease.
The tightening torque of the sensor mounting bolt is 6 - 9 Nm.
Removing the rear wheel rotor
Place the vehicle on a lift and remove the rear wheel.
Using a 7 head, unscrew the drum mounting guide pins.
We insert the pins into the threaded holes of the brake drum and screw the pins in series. Thus, pressing the brake drum.
Remove the brake drum
Removing the rear wheel rotor
In the rear block of a car with an ABS system, a hole for the speed sensor tip
Installation
We apply grease to the landing belt of the hub with grease, install the brake drum and wrap the guide pins. Tightening torque for pins 7 - 15 Nm. Installing the wheel.
Needed to control the speed of the car. They are responsible for smoothly reducing the speed until the moment the car stops. The main task of the braking system is to ensure the safety of people who are in it.
Lada Granta appeared on domestic roads around the end of 2011. The car belongs to the budget class. I must say that this is a fairly reliable and unpretentious car in maintenance. She has good handling and fuel economy.
Developed by Grant. Initially, the car was produced in the sedan body. Since 2013, a hatchback has been created. There are three main configurations for Grants: standard, normal and luxury. the car is equipped with a 1.6-liter power unit, its power is 80-90 horsepower. The manual transmission is five-speed. The car has front-wheel drive.
Complete set of brake system Grants
Compared to Lada Kalina Granta has a more "advanced" braking system. Some vehicles are equipped with an ABS system. In this case, a brake circuit is used that has four channels. In this case, the connection of the channels is carried out in a diagonal pattern.
The main actuator of the anti-lock braking system is the hydromodulator. It is a complex structure, which includes a hydraulic pump, as well as electromagnetic valves. Its installation is carried out in the compartment in which the motor is located. The hydromodulator is controlled electronically. The front and rear brakes are equipped with wheel speed sensors. The work of the Lada Granta brakes is controlled by two systems: working and parking. The first has the following device:
When braking, the wheels are steered diagonally - one front and one rear. The circuit design consists of braking mechanisms that are located on the front right and rear left wheels. If there is a breakdown in one of the circuits, the second circuit will be able to stop the machine.
A fluid pressure regulator is used to limit the flow of fluid into the working mechanisms located on the rear suspension. When the rear axle has insufficient load, during hard braking, this avoids the rear of the Lada Granta skidding. The design excludes the possibility of locking the rear axle.
The body of the regulator is equipped with an opening, which is closed with a plastic plug. If oil is leaking, this is a sign that the sealing of the rings located in the regulator is broken. The vacuum booster is designed to reduce the amount of pressure applied to the pedal that activates the braking device. The principle of its operation consists in the vacuum that occurs in the intake-type pipeline during the operation of the power unit.
The main cylinder housing of the working system is equipped with a reservoir into which liquid is poured. In turn, the tank lid is equipped with a sensor that monitors the insufficient liquid level. When the liquid level in the tank reaches a critical one, a control lamp on the instrument panel lights up.
Checking and bleeding the brakes
In order for the system to work properly, it is recommended to check the condition of the brake pads at least once a month. The brakes in the Lada Granta car can be activated using a manual mechanism. It starts locking the rear wheels by spreading the pads in their drums.
In order for the safety of driving to be at the desired level, check and bleed the brakes.
The check is performed after the vehicle has been jacked up. After that, the wheels are dismantled. Then the drum is removed. If the pins are in a loose state, it is necessary to loosen the handbrake cable. After inspecting the braking device, lubricate and reassemble in reverse order.
After repair, bleeding should be performed in any of the braking device nodes. You need to do this work together. When bleeding the brakes, one person is in the passenger compartment, and the other presses the brake pedal up to five times. At this time, the assistant should loosen the screw that is next to the disk. This allows fluid to drain into the braking device. This procedure is performed several times. The front brakes are adjusted in the same way.
Useful information about rear disc brakes on Lada Granta The updated cooling system of the Lada Grants Pros and cons of automatic and manual transmission Lada Granta
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