VAZ 2112: how to properly bleed the brakes

When it is necessary?

As a rule, if all brake components are in good working order and the brake fluid paths are sealed, then they do not require any bleeding. But if a fuel fluid leak occurs due to damage to the “overpasses” and a drop in its level, both brake repair and mandatory bleeding will be required.

This is a vitally necessary procedure, because airiness in the system can lead to the fact that at the very moment when everything is decided by seconds, the brakes will not work. And there will be nothing left to pump, and no one...

Therefore, let’s take care of this immediately, if we find that the brake pedal has increased travel, it has begun to “go limp,” as car enthusiasts say – the brakes are “wobbly.”

Hydraulic brake circuit diagram

In addition, there are other reasons why pumping is necessary:

• You had to interfere with the operation of the system;
• There were cracks in the hoses, leaks of fuel fluid;
• The brake fluid turned out to be of poor quality and needs to be completely changed;
• Have you changed the brake discs (sooner or later this needs to be done);
• The water content in the fuel fluid has increased (it is hygroscopic, i.e. it absorbs and accumulates water), so it sometimes has to be changed.

What can't you do?

As a rule, during any brake repair work it is necessary to add fuel fluid. Remember: you can only add “original” fluid - the exact brand that is already filled into your VAZ 2110.

Brake fluids from different manufacturers

You should never mix different brands under any circumstances, as the result is unpredictable! If there is no such thing, then the only way out is to completely replace the fuel fluid in the system.

Video about another way to bleed brakes without an assistant

After any repair of a VAZ 2110, bleeding the brakes is a must. When performing work, it is important to carry out actions in accordance with the recommendations and observe safety measures.

When is bleeding the brakes on a VAZ 2110 necessary?

The importance of this procedure can be explained by the fact that excess air may enter the brake system. For this reason, the system may not work as usual. In other words, when you need to brake, due to excess air, the braking system may not work at an important moment. If the car is moving at high speed, then even fractions of seconds play a big role. For this reason, the car's brakes should work properly without any failures.

In addition, there are some other reasons why bleeding the brakes on a VAZ 2110 is necessary:

1. When you press the brake pedal, you feel as if it is sinking and becoming “wobbly”.
2. After making any adjustments to the brake system.
3. Cracks were discovered.
4. It was noticed that the brake fluid was leaking.
5. The brake fluid needs to be replaced because the old one is of low quality.
6. The brake discs were replaced.
7. The brake fluid level has increased due to its hygroscopic composition.

What absolutely cannot be done

Mixing brake fluids from different manufacturers is unacceptable. If you need to add brake fluid, you need to choose the brand that was filled previously. When mixing brake fluids from different manufacturers, the car may behave unpredictably.

If you don't know what fluid was added, the best solution is to completely replace the brake fluid.

Brake bleeding diagram

Bleeding the brakes on a VAZ 2110 is carried out in a strict sequence:

1. The right rear brake is bleeding.
2. Then front left and rear.
3. And finally the front right.

It is not recommended to violate this sequence of bleeding the brakes of the VAZ 2110.

How is pumping done?

It can be done either independently or with an assistant. The procedure for properly bleeding the brakes on a VAZ 2110 will be different.

DIY method

To bleed the brakes on a VAZ 2110 alone you will need the following tools:

• file: round or with a 14 mm drill;
• nipple for car;
• a simple brake reservoir cap with no sensors.

The process of properly bleeding the brakes on a VAZ 2110 with your own hands looks like this:

1. Take the brake reservoir cap and make a hole in it. The nipple is inserted. It is important that there are no gaps and that the tool fits snugly. For greater convenience, it is better to purchase an aerator - a special device.
2. The assembled device connects the valves of the spare wheel and the reservoir.
3. The car is placed on a jack, raised, and all wheels are unscrewed.
4. Now you need to find the fitting for bleeding the brakes on the VAZ 2110 and unscrew it. If brake fluid comes out along with air bubbles, that’s how it should be.
5. For convenience, you can use a compressor and make sure that the pressure is no more than 1 atm.
6. All these actions are performed with each brake, observing the sequence.

Sequence

There is a strict sequence for bleeding the brakes on the VAZ 2110. It is advisable not to violate it. So, the rear right mechanism is pumped first, followed by the front left one diagonally. Then - the rear left, and last - the front right.b

Clean the air release valve Check the level and top up to MAX if necessary

Remove the cap from the valve, put a tube on the fitting and lower it into a container with brake fluid

Press the brake pedal 4-5 times at intervals of 1-2 seconds, after the last pump hold the brake

Unscrew the fitting 1/2 - 3/4 and watch how the liquid and air come out. We tighten the valve, repeat pumping and drain the liquid again until air stops flowing

After pumping, remove the hose and wipe dry. Repeat the operation with the remaining wheels

How to remove the vacuum brake booster of a VAZ 2110

We remove the vacuum booster and brake pedal assembly after removing the engine compartment upholstery, trim and windshield trim.

1. Replacing the vacuum brake booster on a VAZ 2110. The reason for the replacement was that a hissing sound appeared when pressing the brake pedal, which could cause the engine to stall at any moment, the brake pedal became tight. To replace the vacuum booster, it is necessary to disassemble the rear wall of the engine compartment; remove the rubber seal (1), unscrew the upholstery (2) and remove the frill (3).

2. Disconnect the block from the brake fluid level sensor, disconnect the hose from the vacuum booster, and unscrew the two nuts of the brake master cylinder.
3. After that, carefully remove the main brake cylinder (without unscrewing the brake pipes) from the vacuum booster to a distance sufficient to remove the vacuum booster.

4. Inside the car, under the dashboard (under the instrument panel), unscrew the four nuts and remove the wires from the frog. The most difficult thing in replacing the vacuum booster is unscrewing these four nuts, they are very inconveniently located.

5. We remove the vacuum booster along with the pedal assembly.

6. Remove the locking plate and push out the vacuum pusher mounting pin.

7. Unscrew the vacuum booster from the pedal assembly.
   Read also:  Mandrel for centering the clutch of a VAZ 2110
8. We install a new vacuum booster, pay attention to the correct installation, the pedal is at the bottom, and the hose fitting is at the top. Next we assemble in reverse order.

Working with a partner

It’s best – it’s more convenient, more reliable – to bleed the brakes together. By the way, this is exactly how more than 80% of VAZ 2110 owners perform this operation.

First of all, make sure that there are no leaks of the fuel fluid anywhere, and everything is sealed. Then add fluid so that it is at the level of the “Max” line.

Now start bleeding the brakes:

1. The wheel on which you will bleed the mechanism needs to be hung, but how to properly alternate the wheels has already been said;
2. The rear brakes have a special pressure regulator. It must be unlocked by inserting a screwdriver between the piston and the plate;
3. Locate the air bleed valve on the appropriate brake mechanism. Wipe it, remove the cap and put a rubber hose on the head;
4. Pour a little of the same brake fluid that is in the system into a previously prepared three-liter jar (or other transparent container), lower the end of the hose so that the hole is immersed in the liquid;
5. Your assistant, who is behind the wheel, suddenly presses the brake pedal at full speed about 4 or 5 times. When pressing the last time, hold the pedal with your foot at the extreme pressure;
6. At this time, you open the valve halfway or ¾ and observe the fuel fluid that flows out of the hose. There should be air bubbles in it. When the flow stops, close the valve completely;
7. Only after this can your assistant release the pedal;
8. Then the assistant again “pumps” the brake and keeps the pedal pressed, and you repeat the manipulations with the valve;
9. The brake mechanism is considered to be properly pumped when air bubbles are no longer released. That is, 3 - 4 stages may be needed;
10. Now remove the hose, wipe the fitting, attach the protective cap to it;
11. Repeat these same steps with each brake mechanism. Remember to use the diagonal principle correctly;
12. Remove the screwdriver that was used to block the pressure regulator.

Repair kit for master brake cylinder VAZ 2110

Before repairing the GTZ on a VAZ 2110, you need to purchase a repair kit to replace its worn parts and a special key. The key is necessary in order not to tear off the edges of the brake pipe fittings when unscrewing them on the master cylinder body.

Repair kits are divided into complete and incomplete. The complete repair kit includes all cuffs, boot, springs, washers, as well as plastic cones for installing new cuffs on the piston body. An incomplete set usually includes only the master cylinder cuffs themselves.

Remove the negative terminal from the battery and the wire connectors from the brake fluid reservoir.

The brake system is that part of the car that should be very reliable and trouble-free. The presence of air in it is a very bad factor. The car will not be able to reduce speed with the same pedal force. Sometimes the consequences are dire. Therefore, you need to know how to bleed the brakes on a VAZ-2110. The scheme and procedure for performing this operation are further in our article.