The VAZ-2109 brake system is dual-circuit and has a hydraulic drive. The pressure in it is quite large, so it is necessary to use hoses with reliable reinforcement and metal tubes. Of course, their condition must be maintained at the proper level so that there is no leakage of liquid. But the advantage of the system used on the car is that when one of the hoses breaks, braking will still be carried out by two wheels. Consequently, an emergency will be avoided. In extreme cases, you can use the parking brake.
Brake master cylinder
GTZ is the most important, since it is with its help that the necessary pressure is created in the tubes. It consists of a piston, which moves in the cavity of the cylinder, on a perfectly flat surface. As rings, rubber rings are used, which must be replaced during repairs. The brake system of the VAZ-2109 car has high efficiency, this is largely achieved through the use of reliable elements.
Particular attention should be paid to brake fluid during vehicle operation. It is no secret that it is too aggressive, contains many additives that ensure stable operation. Note that during compression there is an increase in the temperature of the liquid, therefore, its viscosity changes. The use of additives allows you to get rid of this effect. One minus is that additional components disappear over time. Experienced craftsmen recommend replacing the fluid in the system at least once every two years.
Vacuum booster
If you know the device of the VAZ-2109 brake system, then you saw that on the firewall (between the passenger compartment and the engine compartment) there is a large, cylindrical shape, a tank with which the GTZ connects. Also from this tank is a hose to the carburetor (if such a fuel injection system is used on a car). This is the vacuum brake booster.
It serves to facilitate driving. With its help, the force that needs to be applied to the pedal to stop the machine is reduced several times. Comfort and safety are provided to you. To appreciate all the advantages of using this device, try to drive on an old "Zhigulenka", which does not have a vacuum amplifier. The difference is simply colossal - all the movements of the pads give blows to the pedal, and the braking performance is extremely low.
Brake calipers
Calipers are mounted on the front axle, which firmly press the pads to the surface of the disc. When a VAZ-2109 brake system is being repaired, it is extremely rare to replace calipers, since they have a long resource. This device, consisting of an aluminum case, in which there is a hole for connecting to the tube using a hose. Nearby is a hole into which the fitting used for pumping the system is screwed. Inside is a steel piston. He sets the pads in motion.
The front caliper is mounted to the wheel hub with two bolts. When working, do not press the brake pedal if the front pads are removed. This will cause the piston to squeeze out of the housing. Collect after that it will not work. The rear brake system of the VAZ-2109 is a little simpler. It uses a support, but it is made in the form of a cylinder, on both sides of which pistons are located. With their help, breeding pads to the sides.
Pressure regulator
This element allows you to make the brake system more efficient. It is no secret that the entire braking process is performed on 75% of the front wheels. And the rest - back. But this is an approximate value, it depends on many parameters. For example, the degree of vehicle load affects it, as well as the intensity of braking. Therefore, for efficient operation it is necessary that the VAZ-2109 brake system independently adjusts the force on the calipers of the front and rear wheels.
With this simple mechanism, the pressure in the tube through which fluid is supplied to the rear axle of the car is reduced. Fastening it to the rear beam using the bracket. When carrying out repairs, threaded joints must be pre-treated with penetrating grease. To unscrew the ends of the tubes you will need to use a special key. It can be purchased at car dealerships, it is crimp type. Unlike carob or cape, it does not lick the verge.
Parking brake cable
You can even say that this is a secondary element of the entire system, because, unfortunately, not all motorists use the parking brake. Therefore, they do not monitor the state of this node, without which the scheme of the VAZ -2109 brake system would seem incomplete. The reason for this is the habit of setting the machine at speed. And in winter, such a habit is useful, because freezing of the block to the drum may occur. At the beginning of the movement, the entire mechanism in the rear drums may simply fall apart.
But often a parking brake is needed. Only not everyone can correctly adjust it. It is desirable to carry out the work on a pit or a lift, it’s more convenient. First, double-click the parking brake lever. Then, using keys and penetrating grease, loosen the lock nut. Second, adjust the nut, tighten the cable. Lower the lever and check that the pads do not touch the drums. If not, the setup is done correctly.
Replacing tubing and hose
When carrying out this work, you will need to use a special crimp key for 8, which was mentioned above. You also need to purchase copper gaskets in the store. Older use is prohibited, as they are deformed and will not be able to ensure tightness. In total, the VAZ-2109 brake system has three flexible tubes - for connecting the front calipers and for connecting the amplifier to the rear wheel circuit.
When replacing the hose, drain completely with liquid. To do this, unscrew the fittings on each of the calipers. A metal bracket is installed at the junction of the flexible and solid tubes, which fastens them to the bracket on the body. Also, hoses with a rubber seal are attached to the shock absorber strut. At the junction of the hose with the metal tube and the caliper, it is necessary to install copper washers for sealing.
Brake fluid change
The fluid in the system is replaced as planned, as mentioned above, every two years. But if the VAZ-2109 brake system is being repaired, new pipes or hoses are installed, then you will need to add fluid and pump. To do this, all the elements are collected, the liquid is poured into the expansion tank. Pumping is carried out from the farthest wheel - the rear right. And move forward as you approach the front left, which is closest to the brake cylinder. In order not to get confused for the first time, the VAZ-2109 brake system circuit will help you.
A small container in which you pour brake fluid will come in handy. You also need to use a small piece of transparent hose. If not suitable, then borrow from the windshield cleaning system for the duration of the repair. Use it to control the air leaving the system through the bubbles. The assistant is seated in the driver's seat, he must squeeze the pedal and keep it in the extreme position. At this time, you unscrew the fitting and bleed air. However, with any malfunction of the VAZ-2109 brake system, pumping must be carried out - this will ensure operational efficiency.
Pad replacement
However, this is the simplest thing that you can expect when servicing. Unfortunately, the VAZ-2109 cars do not provide for control of the wear of the pads, so it must be carried out visually. To carry out the replacement, you will need to remove the wheel, having previously lifted the repaired side. After that, unscrew one bolt securing the caliper and shift its front part, freeing up access to the pads that you simply remove. The device of the VAZ-2109 brake system is such that it is not necessary to completely remove the caliper. Install new pads immediately does not work. First, use the mount to press the caliper piston to increase the gap from it to the surface of the disc.