Where is the brake fluid reservoir of the VAZ 2107?

The brake system of a VAZ 2107 car consists of discs, calipers, main and working cylinders, pads, pipes inside which brake fluid flows (hereinafter referred to as TF).

The quality of braking depends on the service life of the fluid, cleanliness, and sediment. The European Motorists Association explains that in 28% of accidents the cause is a faulty brake circuit (BC). The indicator is above the average for the CIS countries and the Russian Federation, among others.

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Replacing (renewing) the fluid on your own is not at all difficult, but be extremely careful not to violate the established regulations. Otherwise, you risk damaging the seals and working cylinders on the caliper.

What brake fluid should be used on a VAZ 2107 car

The design of the TC is as follows: a caliper is installed on each wheel, inside of which there are two brake pads. They compress the disc when you press the pedal. The pressure inside the circuit increases, which is transmitted by the fuel fluid to the working cylinders and pads.

After the driver releases the pedal, the pressure in the circuit is restored, the disc and pads return to their original position. During operation of the machine, due to temperature changes, sediment forms in the liquid, the circuits become clogged, and obstacles are created to the natural circulation of the “lubricant”. Highways require urgent maintenance, cleaning, and replacement of sealing elements.

Cars of the VAZ 2107 family are required to be fueled with DOT-4 class diesel fuel based on synthetic and semi-synthetic bases. Mineral is excluded from use.

Until 1995, DOT-3 was filled into the VAZ brake circuit. Due to low technical characteristics and non-compliance with modern requirements and standards, the third class was excluded.

AvtoVAZ engineers recommend updating the TZ every 45,000 km or three years from the date of refueling, whichever comes first.

The 4th – 6th generation bunkers have one drawback – active absorption of moisture and condensate. This is explained by the peculiarities of the hygroscopic structure at the molecular level. The more water absorbed, the fewer nutrients inside, the weaker the structure.

The “boiling point” of DOT-4 is 250°, after the vehicle has run 60 thousand km. 130°. A low “boiling” threshold is one of the factors creating an emergency situation on the roads, jamming of calipers and working cylinders.

Note to the driver. Do not mix synthetic, semi-synthetic and mineral based fuels with each other. As a result of a chemical reaction, the liquid coagulates, forming a thick, homogeneous mass that will clog the circuit lines.

Types and properties of fuel fluid

Any brake fluid has 93-98% of the main composition and from 2 to 7% of additives, which, in fact, are the key component for imparting the declared characteristics. In general, if you look at it this way, the properties of brake fluid depend on the combination of its components. Depending on the composition of the base, TJ is divided into 3 groups.

Types of brake fluids:

1. Mineral (mineral oil LHM) . They consist of alcohol and castor oil.
2. Glycolic . Developed on the basis of polyglycols and their esters.
3. Silicone . Manufactured from silicon-organic polymer products.

Regardless of the type and composition, all brake fluids are divided into two classifications.

Classification of TJ:

1. By viscosity.
2. By boiling point:

• for “dry” liquid (without water);
• “wet”, which contains 3.5% water.

If the boiling point exceeds the permissible norm, then there is a risk of a vapor lock forming in the system (as a result of moisture evaporation), which can lead to breakdown and failure of the brake pedal.

Review of Manufacturer Prices

How does braking occur in a VAZ 2107

After pressing the brake pedal, the pressure inside the system increases, kinetic energy is transferred from the pedal to the working cylinders. As a result, the pads and disc are compressed, the car slows down and stops.

A fuel fluid that has lost its properties often leads to brake failure, jamming of the working cylinders, and depressurization of the circuit. When driving at high speeds, this is fraught with an emergency situation, a collision with oncoming traffic.

Note to the driver. Carry out preventive work with gloves. TJ is an aggressive environment and causes allergic reactions when it comes into contact with the skin. Wash your hands with running water and soap.

The volume of fuel fluid recommended by the manufacturer in the VAZ 2107 is 1.0 liter. During the operation of a technical product, topping up is often required for various reasons. Buy DOT-4 with a reserve of at least one and a half liters in total volume. When purchasing, check the class type of base TZh. Do not mix synthetics with mineral ones.

How to properly fill brake fluid on a VAZ 2107

• DOT-4 in a volume of 1.0 – 1.5 liters, with a reserve in the tank;
• plastic container to change waste;
• rubber hose;
• key to “10”;
• rags;
• flashlight;
• new boots on the working cylinders as needed.

• Install the machine above the inspection hole;
• Open the hood, unscrew the cap from the expansion tank of the master brake cylinder;
• Bleed the brake pedal, hold it in the lower position (assistant function);
• Remove the rubber cap on the working cylinder, put the hose on the grease fitting, and lower the end into a plastic container;
• Using the key “10”, unscrew the grease fitting, drain the fuel fluid, tighten the valve;
• Repeat the procedure with pumping until light DOT-4 liquid flows from the hose.

3 flushes are enough to completely update the system. After each cycle, replenish the missing amount of DOT - 4 in the expansion tank. After updating the contour of one working cylinder, we move on to the next. DIY replacement completed.

We pump the front and rear brake circuits according to an identical scheme; there are no fundamental differences.

Replacement

To replace the TJ yourself, you will need a certain set of tools and materials. This set includes:

• Brake fluid - 500 millimeters;
• A set of keys;
• Screwdriver Set;
• Transparent flexible hose;
• Container for draining old fluid;
• Dry rags for cleaning surfaces.

To work, you will definitely need the help of one more person, so when pumping, one should be inside the car, and the other outside.

Let's start the procedure.

1. Unscrew the cap on the master cylinder reservoir and place it on a prepared surface. The cover is combined with the float of the fuel oil level sensor, so be careful, because a toxic and dangerous substance will remain on it.
2. Unlock the rear brakes using a screwdriver. It is simply inserted between the plate and the piston. Ready.

Inserted a screwdriver

1. Clean the right rear brake release valve of any accumulated dirt and dust, then remove the rubber cap that covers the valve.
2. Place a flexible transparent hose onto the valve fitting and place its other end in a container to drain the liquid.
3. Approximately once every two seconds, press the gas pedal all the way four times in succession. When you press the fifth time, lock the pedal in the clamped position.
4. Unscrew the valve at least half a turn. As the brake fluid drains, the pedal will gradually begin to sink.
5. As soon as the fluid flow stops, close the valve.
6. Simultaneously with the procedure, do not forget to monitor the level of fuel fluid in the tank.
7. As you pump out the old substance, add a little new one. This will avoid the formation of air locks inside the system.
8. Add fresh fuel fluid into the tank until all the old fluid comes out and new clean substance begins to flow through the hose into the container.
9. Having completed the work on the rear right wheel, go to the front left and perform a similar procedure. Due to this movement pattern, you will be able to completely get rid of the old fuel oil in one circuit.
10. By analogy, remove the fuel fluid from the second circuit in the same sequence. Having completed draining, close the valves with caps and add new fuel fluid to the required level.

Accuracy comes first

After completing the replacement procedure, be sure to bleed the brakes. It is strictly not recommended to go out on the road without it, since the brakes may simply not work.

Why bleed the brakes?

Bleeding a vehicle is a preventive measure aimed at ensuring stable operation of the brakes. The point is to remove foreign liquid and excess air.

Air and excess liquid can appear in the system for various reasons. Namely:

• The hoses are damaged and their integrity is compromised;
• Low-quality brake substance is used;
• System elements were replaced or brake fluid was updated;
• The seal of the vehicle is broken.

Any braking system, due to its design, can spontaneously accumulate moisture inside itself. Therefore, pumping cannot be ignored under any circumstances.

Signs of brake fluid loss of quality

• Increasing the length of the path to a complete stop of the car;
• Pressing the brake pedal requires force;
• The pillbox in the expansion tank changed color from light to dark;
• At the place where the tank is installed, traces of lubricant leakage are visible, the level is below normal;
• The yellow indicator on the dashboard indicates the fluid level sensor in the system.

If one or more signs are detected, stop the car, turn off the engine, and inspect the brake circuit and master cylinder. Subsequent operation of the technical device is unsafe.

The design of the VAZ 2107 car uses a braking system, on the serviceability of which the safety of the driver and passengers depends. This system consists of a large number of different parts, and an important role is assigned to the brake fluid reservoir of the VAZ 2107. This is a special container into which a special liquid mass is poured, which takes an active part in the operation of the system.

Reasons for replacement

There are several characteristic malfunctions that must necessarily entail the replacement of the TJ.

1. The presence of leaks from the brake cylinders, which lead to the loss of a large amount of fluid.
2. The appearance of air pockets in the pipeline and hose system. They arise due to a leak in the brake system elements.
3. Scuffs or deformation of flexible hoses installed on wheels. They also require replacement of the hoses themselves.
4. Violation of the integrity of the sealing rings in the main brake cylinder, which leads to leakage of the working substance.
5. Fluid leaking through the sealing ring of the pusher on the rear wheels.
6. Violation of the tightness of the system circuit. This can be felt by a partially collapsed brake pedal.
7. Mechanical failure of one of the elements of the braking system. In addition to repairing or replacing them, you will definitely have to change the TZ.

Choice of TZ

IMPORTANT! To ensure normal functionality of the braking system, the brake fluid must be selected correctly. Modern compositions like "Rosa" consist of 93-98 percent polyglycols

The remaining percentages are additives that help combat oxidation and corrosion on the metal components of the vehicle.

To choose the best option for a brake substance, you should take into account the main parameters of its selection so that it meets the requirements of the VAZ 2114 model. After all, this is the car we are talking about

Having chosen the vehicle that is suitable for your car, you should replace it. It’s entirely possible to do the work yourself, but you should first read the instruction manual, consult with specialists, or watch visual video lessons.

Draining and bleeding process

Purpose of the container

The design of the domestic VAZ 2107 car uses a hydraulic braking system, consisting of drive and actuator mechanisms, as well as lines in the form of tubes and hoses, and a reservoir filled with liquid. This liquid substance acts as a drive source, and it is called brake fluid - an acid that is hygroscopic. It is poured into a transparent plastic container under the hood, but more on that.

The container in question on the seven is made of soft and impact-resistant plastic. It is almost impossible to break the tank, but it is easy to damage it with a sharp tool. The reservoir is filled with fluid, which goes to the master cylinder. The piston moves in the cylinder when the middle pedal is pressed, thereby increasing the pressure in the system. When the pressure increases, the working cylinders are activated, in which the pistons move under the action of a liquid substance.

From a brief description of the principle of operation of the brake system on the VAZ 2107, it is clear that the reservoir plays a fundamental role. It ensures an uninterrupted supply of working substance to the main cylinder of the system. If lines or operating mechanisms are damaged, the tightness of the system is compromised. Due to the fact that the tank has transparent walls, it is possible to identify system malfunctions easily and quickly. To do this, you need to open the hood and look to see if the container is full.

How to change the tank

Before replacing the brake fluid reservoir, you need to understand its location. The reservoir is located on the driver's side under the hood. When you open the hood, you need to look at the wall closest to the cabin, where there will be two plastic tanks next to each other. The first reservoir, which is located to the left, is a container for brake fluid. Next to this tank there is another tank of a smaller volume - this is a container for a similar substance, which is used in the clutch system.

Vehicle owners should be aware that brake fluid must be replaced every 40 thousand km. If the car has mileage above this indicator, then the quality of the mixture deteriorates, which can cause brake failure at any time. In addition to replacing the mixture every 40,000 km, it is also necessary to periodically monitor the level of brake fluid in the reservoir and, if necessary, top it up.

Video - do you need a pressure regulator or not?

Timely maintenance of your vehicle will help you avoid serious breakdowns and accidents.

In the video and article we will talk about replacing brake fluid.

It should be noted that even many Germans drive with expired brake fluid. What then can we say about car enthusiasts from Russia? Many drivers encounter a car in front with one, or sometimes two, inoperative brake lights. It is completely unknown what is splashing in the brake systems of these cars, it’s scary to imagine.

Some fearless drivers can drive without brakes at all, but sooner or later life will punish them for such negligence; there are simply a lot of surprises on the roads. The brake system is one of the most important components of any car, which ensures safety.

Disadvantages of old brake fluid

• Pre-boiling

Please note that brake fluid is hygroscopic. The liquid that has accumulated water boils at lower temperatures. For fans of high-speed driving on a hot day, it is enough to brake sharply a couple of times for the brake fluid to boil. In addition, the effectiveness of the brakes decreases.

• Water in the brake system

This primarily provides favorable conditions for the development of corrosion. Even if the brake cylinders look good externally, but when braking the car pulls to the side, remember when you changed the brake fluid.

Braking system VAZ 2107. Description

“Seven” has two brake systems: service and parking. The first is designed to reduce the speed of movement and stop, the second is to hold the car while parking (stopping).

The peculiarity of the VAZ 2107 brake system is simplicity and reliability. Complex electronic components (anti-lock braking system, stabilization and brake force redistribution systems are absent), which simplifies independent repair and maintenance of the brake system.

The VAZ 2107 brake system diagram consists of two elements:

• A brake mechanism that directly implements the braking function.
• Brake actuator that controls the brake mechanism.

The VAZ 2107 uses compression disk (front) and expansion drum (rear) brake mechanisms based on friction force.

The hydraulic drive of the VAZ 2107 brake mechanism is based on the transmission of force from the brake pedal to the brake mechanisms through brake fluid. Drive includes:

• The brake pedal controls the brake system.
• Vacuum booster that creates additional force when pressing the pedal.
• The master brake cylinder provides brake fluid pressure in the system.
• Expansion tank for brake fluid.
• Working cylinders that transmit force to the brake mechanisms.
• Fluid pressure regulator in the rear brake circuit, changing the force in accordance with the vehicle load.
• Hoses and lines that carry brake fluid throughout the system.

To increase the reliability of the system, it includes two independent brake drive circuits - rear and front. If one circuit breaks down, the other can perform its functions.

Brake master cylinder

The master cylinder is connected to the booster. This element is a housing to which the supply and return pipelines from the fluid reservoir are connected, and 3 pipelines leading to the brake mechanisms exit. There is one pipeline leading to the front brake mechanisms, and only one to the rear, leading to the regulator.

Inside this housing there are pistons that push the liquid into the pipelines. One of them is connected to the amplifier diaphragm rod. These are the main elements of the drive. The detailed design of the brake master cylinder is shown above.

Hydraulic brake system VAZ 2107 (injector). Principle of operation

The operation of VAZ brakes is typical for passenger cars. Depressing the brake pedal moves the piston in the master cylinder, increasing the pressure of the brake fluid, which moves through the pipelines to the wheel cylinders. The pressure of the brake fluid forces the pistons of the cylinders to mix, which transmit force to the pads. The latter are pressed against the brake discs and drums, slowing down the movement of the latter. Together with the drums and discs, the wheels stop, slowing down the movement of the machine.

Vacuum brake booster

A rod connected to the amplifier is connected to the pedal. The design of the VAZ-2107 vacuum brake booster is quite interesting; it is shown in the figure:

The amplifier is a sealed container, internally divided into 2 chambers by means of a membrane. The chamber located closer to the pedal is called atmospheric, and the chamber separated from it by a membrane is called vacuum. The diaphragm itself is connected to the piston rod of the master cylinder.

The vacuum chamber is connected by a pipe to the intake manifold of the engine, where the vacuum comes from. The design also includes a follower valve controlled by the pedal rod, which does all the work.

When the pedal is released, this valve connects the chamber cavities through a channel, providing identical pressure. When the pedal is applied, the valve closes the channel connecting the chambers and opens the channel connecting the atmospheric chamber with the atmosphere. Since a vacuum is maintained in the second chamber, atmospheric pressure begins to put pressure on the membrane. Since it is connected to the piston rod of the master cylinder, due to the movement of the piston, fluid is displaced from the cylinder into the pipelines.

Absolute malfunctions of the VAZ 2107 brake system

Ineffective brake system operation is the most common malfunction. It is diagnosed by an increase in braking distance and worsening deceleration during braking. This can be determined by eye. If the braking distance from a speed of 40 km/h exceeds 12.2 meters, the use of the vehicle (even to move to the repair site) is prohibited.

The causes of the malfunction may be:

• Brake fluid leak.
• Presence of air in the system. Relative malfunctions of the brake system of the VAZ 2107
  Increasing the brake pedal travel (“soft” or “sinking” pedal). The cause of the malfunction is the presence of air in the brake fluid circuits and wear of the brake system cylinders. Sometimes the cause may be a damaged brake hose that "inflates" as pressure increases. This option is the most dangerous. If a faulty brake hose is not noticed in time, it may burst, resulting in brake failure.

  To eliminate the malfunction, you need to replace the faulty elements and bleed the brake system.

  Changing the trajectory of a car when braking. The reason for this is worn pads or faulty working cylinders. Replacing or repairing faulty parts and components will help solve the problem.

  Noise and grinding noise in the brake mechanism while driving or braking. Usually the problem occurs in the rear mechanisms. Its cause is uneven wear of the drums (or front brake discs), unacceptable wear of the pads, dirt getting into the brake mechanism, and breakage of the spring elements. To get rid of the noise, you need to replace the parts of the mechanism and clean (rinse) it.

  Vibration when braking . The malfunction is caused by deformation or uneven wear of the brake discs (drums). The only way to repair them is to replace them with serviceable ones.

Replacing brake cylinders in VAZ 2106 calipers

The following must be said right away: repairing working cylinders on a VAZ 2106 is a completely thankless task. The only situation in which it is advisable to do this is if the cylinder is corroded or heavily soiled. In this case, the cylinder is simply thoroughly cleaned of layers of rust and installed in place. And if the breakdown is more serious, then the only option is to replace the cylinders, since it is not possible to find spare parts for them on sale. Here's what you'll need to get started:

• a set of new brake cylinders for VAZ 2106;
• flat screwdriver;
• bench vice;
• hammer;
• mounting blade;
• small crowbar;
• open-end wrenches, set.

Sequence of operations

To get to the damaged cylinder, you will first have to jack up the car and remove the wheel. This will give you access to the brake caliper. This caliper will also need to be removed by unscrewing the two mounting nuts.

1. After removal, the caliper is screwed into a bench vise. Using a 12-mm open-end wrench, unscrew a pair of nuts holding the hydraulic tube to the working cylinders. The tube is removed.
2. There is a groove on the side of the caliper in which there is a retainer with a spring. This clamp is moved downwards using a flathead screwdriver.
3. While holding the latch, carefully hit the cylinder several times with a hammer in the direction shown by the arrow in the picture.
4. After several blows, the cylinder will move and a small gap will appear next to it, where you can insert the edge of the mounting blade. Using the spatula as a lever, the cylinder needs to be moved a little more to the left.
5. As soon as the gap next to the cylinder becomes even wider, you can insert a small crowbar into it. With its help, the cylinder finally moves out of its niche.
6. The broken cylinder is replaced with a new one, after which the VAZ 2106 brake system is reassembled.

Conclusion

The brake system of the VAZ 2107 is an important component of the vehicle control system. The life and health of the driver, passengers and other road users depends on its serviceability. The likelihood of getting into an accident if your brakes fail is very high. The only thing more dangerous in its consequences is a breakdown of the steering. Therefore, it is necessary to constantly monitor the condition of the brake system and each of its components. It is especially important to regularly check the condition of the brake hoses. Despite the presence of two independent brake circuits, a burst brake hose leads to a drop in pressure and complete failure of the brake system. To fully use a working brake circuit, you need to press the brake pedal several times, and this may simply not be enough time.

Monitoring the condition and timely repair of the brake system is a vital necessity.

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Leveling up

In fact, you can bleed the brakes on your own, and sometimes there is even no other way out. First, we recommend watching a training video in which you will be able to clearly study all the nuances of the procedure.

Important rule. Do not add new fuel fluid to the system if it does not match the composition of the old substance

Make sure that everything is good with the vehicle’s tightness, so that the work is not done in vain.

If you have just finished replacing your vehicle, do not rush to let your friend go home. You will also need it at the pumping stage.

Press the pedal to the floor

The brakes need to be bled in a certain sequence:

• Right rear brake.
• Left front brake.
• Left back.
• Right front.

We begin the pumping procedure.

1. Check the brake fluid level in the reservoir. Before pumping, it must be as full as possible;
2. Clean the outlet valve from any contaminants present there;
3. Remove the protective cap from the valve, and before that fill the glass container with the working substance - TJ;
4. Take a rubber hose and place it on the valve head;
5. Place the other end in a container with TJ. This is a homemade device for pumping, which is not inferior in efficiency to professional equipment at car service stations;
6. Approximately five times with a break of 2 seconds, press the brake pedal all the way;
7. After making the last press, lock the pedal to the floor;
8. Unscrew the valve 75 percent;
9. Liquid with bubbles will begin to flow from there;
10. As soon as the flow stops, you can close the valve;
11. After closing the valve, release the pedal;
12. Repeat steps 5-7 at least one more time. More bleeding cycles may be required. Your task is to ensure that there are no air bubbles when the liquid flows out;
13. As the fuel fluid flows out, be sure to add it to the tank, maintaining it at the maximum level;
14. Having completed pumping, remove the hose, remove all traces of fuel fluid from the fitting and screw on the cap.

Despite the abundance of stages, in practice the work does not take much time. But by replacing and pumping the vehicle yourself, you can significantly save on car service costs.

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