The main brake cylinder VAZ-2109: design. To change or repair?

The article will describe the element, such as the main brake cylinder VAZ-2109, as well as its functions and design features. But first you should consider the brake system "Nines". It is extremely simple and does not contain complex elements. After all, there is no such function on this car as an anti-lock system, for example. Consequently, no sensors and controls. Even the wear of the shoes is assessed visually by the driver. It is worth noting that on newer versions - VAZ-2114 and 2115 - sensors are installed, signaling the wear of the pads.

Brake system construction

The system has only two circuits, they work relatively independently. In other words, if something suddenly happens to one of them, the second one continues to work. Thus the main brake cylinder VAZ-2109 can even have a leak. And if it is not fatal, then the car will continue to function normally. Of course, when you operate on the same circuit, you will feel some inconvenience - the car will necessarily lead to the side when you press the pedal.

In addition, the braking efficiency becomes extremely low. Therefore, it is impossible to drive with faulty and leaking brakes. The main element is the main brake cylinder VAZ-2109, it is with its help that the force you apply to the pedal is converted to fluid pressure. The actuators are the cylinders on the rear wheels and the calipers on the front wheels. With their help pads and drums press against the discs and brake the car. But now more in detail about what are the rear and front brakes.

Front brakes

On the hub is a disk of durable metal. These two elements are tightly connected. For example, on a VAZ-2109 it is produced, firstly, by means of tapered studs, which are also guides. Secondly, the bolts that fasten the wheel to the hub. Consequently, the speed of rotation of the wheel and the brake disc is always the same. And to stop the wheel, you need to clamp the disc, as if in a vice.

And this is done with a simple mechanism called a support. It consists of two halves - internal and external. On the inside there is a kind of cylinder in which the piston is located. It is he who moves and presses the inner shoe to the surface of the disk, the outer one moves towards. When pressure is lost in the system, all pads under the action of return springs are moved to their original position. Please note that when the replacement of the VAZ-2109 brake cylinder is performed, it is necessary to pump the system to get rid of air.

Rear brakes

Almost the same design and the brake system on the rear axle. The only difference is that there is no disc, its functions are performed by the drum. It is made of an alloy of aluminum, inside a heavy metal. Pads have a metal base, and on the outside there are lining friction material. The brake pads of the special design brake cylinder (rear) VAZ-2109 are put into motion. With its help, the pads expand and abut against the inner surface of the drum.

Due to this, the braking process takes place. It is worth noting that on all cars, the following distribution of force along the front and rear axles occurs:

1. Front brakes perform most of the process - about 70%.
2. The rear brakes account for no more than 30%.

Consequently, the wear at the front and rear pads will be different. The rear serve about twice as long. Therefore, most of the motorists pay attention to those that stand on the front axle. And the time of the back comes when the handbrake ceases to work (however, this also does not matter for many), and there are extraneous squeaks and sounds.

Master cylinder

The main brake cylinder VAZ-2109 is not very complicated design, made of aluminum alloy. The body is one-piece, the tubes and the expansion tank are attached to it to maintain the liquid level in the system. The internal cavity of the GTZ is perfectly smooth, made of steel. Inside, under the action of the force transferred from the pedal, two pistons move. They are intended for various contours of the system. Pistons are made in the form of a thimble, but on the outside they have rubber rings, which are designed to improve the tightness. Such spare parts for the VAZ-2109, like the rings of the MTC, can be found in the repair kits for these units. With their help it turns out to create the maximum pressure in the tubes going to the shoe. The expansion tank is made of plastic, the plug is screwed inward with a float type level sensor . A microswitch is connected to it, which closes the lamps of a low level of the brake fluid.

Main cylinder maintenance

You are well aware that the spare parts for the VAZ-2109 are more expensive than the classic series. But as for the braking system, it is very similar in these cars. The only difference is that on "Devyatki" all the elements are much more powerful, stronger, since the load on the entire car and the system is higher. It is not necessary to service GTZ if it is operating in an ideal mode. In a timely manner, it is necessary to fill in the liquid and make sure there are no leaks. But if they appeared, it is necessary to decide whether to repair or install a new one.

Replace or repair?

Please note that the cost of the VAZ-2109 brake cylinder is about 500 rubles. And it does not matter whether you change it or repair it, you need to drain the liquid. And pumping can not be avoided. But if you replace the rubber sealing rings, there is a good chance that the parts from the repair kit (usually manufactured by the People's Republic of China, and even worse, the underground ones) will not be suitable. And do not forget that on the inner surface of the cylinder there is a development that will not allow to develop the required pressure. Therefore, replacing the brake cylinder VAZ-2109 is the most suitable option.