Brake system VAZ-2107: scheme, device, repair

An extremely important role is played by the VAZ-2107 braking system in the car. With its help, the machine stops. Everything depends on the effectiveness of inhibition. A timely stop of the car is necessary to prevent a collision or a collision on the obstacle. The safety of your brake system depends on how good a condition is. Therefore, we can conclude that this issue should be given maximum attention. And note to fans of tuning: the braking system is designed for the loads that are created by the engine. Therefore, as the motor power increases, it is necessary to strengthen the calipers and increase the contact area of the pads with the discs.

Front wheel calipers

And now in more detail about all the elements of the system. A bit out of order, but still. Front wheel calipers are mechanisms that compress and release pads.

The front brake system VAZ-2107 consists of two calipers - on each wheel one at a time. They are made of aluminum, but not completely. Inside is a large diameter piston, which fits snugly against the body. This eliminates the possibility of leakage of the brake fluid. By the way, if such a phenomenon is observed, then there is no sense to repair the support, it is easier to replace it with a new one.

How was the installation of the calipers?

Fastening of a support of a forward brake disk is made by means of two bolts to a nave. In order to ensure safety, it is necessary that these bolts can not get out. To do this, they are fixed with a metal plate.

The installation of the support is made in such a way that the pads are located inside. They base their base against the body (outer shoe) and piston. Asbestos coating of them is directed towards the metal brake disc. Inside the caliper body there is a liquid that flows through the rubber hose. The housing also has a hole in which there is a special fitting for the pumping of the system.

Rear wheel calipers

On the rear axle, the VAZ-2107 brake system has a classic design, as on most cars. It should be noted that about 75% of the braking is carried out by the front wheels. Rear only a little podtormazhivayut. For this reason, the manufacturer decided that it would be pointless to use disc brakes . Of course, it's much more effective to use disks, not standard drums. But there are minor difficulties associated with the implementation of the normal functioning of the parking brake - the need for mounting an additional cylinder in the system.

But from the factory cars VAZ-2107 went exactly with drum brakes from behind. Despite the fact that they have low efficiency, they cope with their main task. The braking system VAZ-2107, the malfunctions of which are eliminated quite simply, works with a pressure regulator that is mounted near the rear beam. With the help of such a device, the pressure of the liquid entering the contour of the rear wheels is monitored. Since the pads for drums are installed, they have a slightly different drive than on the front wheels. The main task is to separate the pads. For this purpose, a cylinder is mounted in the upper part, which has two pistons. With their help, the pads are unlocked.

The vacuum amplifier of brakes

Without this mechanism, the VAZ-2107 braking system, the device of which is considered, would be similar to the one used earlier on "pennies". Comfort without a vacuum amplifier is completely absent. It is necessary to press the pedal with very great effort, the braking efficiency is low, and all the pads of the pads on the disc are given to you in the foot. But here the application of this unit in the system made it possible to achieve high performance. The brake booster is installed between the pedal and the master cylinder rod.

Therefore, there is a gap between your leg and the piston, which creates pressure in the system. This allows you to reduce the force applied to the pedal many times. At the same time, the braking efficiency only increases. Fastening of the vacuum amplifier is made to the partition between the cabin and the engine compartment of the car. On most modern machines, vacuum cleaners have four studs that enter the holes on the bulkhead. From the side of the cabin, under the layer of noise insulation, the nuts are screwed. But first on the studs are mounted engravers, so that during operation the tightening of the threaded joint does not loosen.

Master Brake Cylinder

Perhaps this is the main element of the system, since it creates a high pressure in the tubes. As you managed to understand, it is due to pressure and braking occurs - the pads are released when the calipers move. The braking system VAZ-2107, the scheme of which is presented in our review, also includes a cylinder. It is made of metal, inside it there is a cavity of cylindrical shape. The entire inner surface is perfectly smooth, as it slides pistons along it.

Their system is quite interesting. The fact is that they create pressure in two circuits. Metal pistons, resembling thimbles, have rubber sealing rings on the outside. They ensure maximum tightness. The movement of the pistons along the cylinder is synchronous, they are connected with each other by springs with high rigidity. The first piston is supported by the rod, which exits the brake booster. The GTZ has several openings - for connection to the expansion tank and for connecting pipes to the calipers of the front and rear wheels.

Front brake pads

They have already been told a little, but it's worth talking about in more detail. So, about 75% of the braking is done by the front wheels. Consequently, the wear of the pads on this axis will be much higher. For this reason, the VAZ-2107 braking system, which is relatively rare to repair, needs more often to replace the front pads than the rear ones. They are a metal plate on which is coated with asbestos. This layer, quite strong and reliable, provides excellent braking. But most importantly - reduces the wear of metal on the disc.

Rear brake pads

The rear pads have a different design, since the mechanism is somewhat different. These are two rigid metal plates, shaped like a semicircle. On the inside, they have holes for fixing to the wheel hub. On the outside, there are friction pads that touch the drum part. Also provided for connecting the mechanism of manual release of the shoes - parking brake. The halves are connected by means of metal plates and rigid springs. It is from these elements is the braking system VAZ-2107, the device can be called classic, like the car model.

Brake fluid

No matter how you try to identify the most important element of the system, it is difficult to do this. The thing is that when you change the parameters of any node, the entire operation of the mechanism is disrupted without exception. And a lot depends on the fluid. And more precisely, from its quality. The brake system VAZ-2107, the circuit of which consists of a cylinder, supports and tubes connecting these elements, is filled with a special liquid, into which a large number of additives improving the performance is made. It is with their help that not only effective braking is ensured, but also prevention of the destruction of internal cavities of tubes, calipers and cylinders.

When to change the liquid?

Remember the school course of physics. What happens to the liquid when it shrinks dramatically? That's right, its temperature is skyrocketing. Consequently, the volume, viscosity, and density vary. In other words, this liquid completely changes its properties. To prevent this, manufacturers of brake fluids and additives. They allow you to get rid of the negative effects of pressure and improve the cooling of the liquid.

Both the rear brake system VAZ-2107, and the front works under great pressure. Unfortunately, all these additives evaporate in a couple of years of the car's operation. Therefore, it is necessary to carry out a replacement in a timely manner in order to improve the performance of the system. Proceeding from this, we can say that the replacement of fluid in the braking system must be made at least once every two years. At a greater mileage car can increase the frequency of replacement.

Expansion tank

In the design of any system there are rigid tubes, rubber hoses and expansion tanks. The latter is necessary to maintain the level of liquid in the system, as it eliminates the risk of air plugs in the pipelines. It is in the expansion tank that liquid is refilled.

It should be noted that the VAZ-2107 braking system, the malfunctions of which are often accompanied by leaks, need to be pumped. This procedure does not present great difficulties, but it will be necessary to take the help of a second person. He will have to squeeze the brake pedal in order to force the fluid to go along the contours. But notice that before that it is necessary to ensure maximum tightness in all connections.

Tubes and Hoses

To improve the tightness, use soft copper washers. They are installed at the junction of rubber tubes with the rest of the elements. The purpose of using rubber tubes is to be able to turn the steering wheel without risk of system failure.

Similarly with the rear axle, on which the hose is used for the transition between rigid tubes mounted on the beam and body. In other words, in places that do not move, rigid tubes are laid. If there is a movement of a node, then flexible hoses must be used.