Vacuum brake booster VAZ 2114 - step-by-step replacement instructions

A vacuum booster is a device consisting of a casing in which a valve is located. The part is divided into two parts using a rubber layer called a diaphragm. One part is atmospheric, and the second is a vacuum space and is connected to the intake pipe from the internal combustion engine.

The booster valve is a plastic casing that houses essential parts that wear out over time. Subsequently, the driver can observe the rattling of the gearbox. The part consists of the following elements:

A rod located on the support bushing.
There is a piston nearby.
Buffer.
Valve with pusher and return springs, as well as filter.

VUT works as follows:

The driver presses the brake pedal to the floor
At this time, the piston and valve tappet move.
The space between the two parts of the amplifier opens up.
The air exerts pressure on the damper between the two parts of the VUT and, as a result, a different level of pressure is created in each part.
Due to this difference, the valve and rod move.
As soon as the pedal is released, all elements return to their places and the system stops working.

During the operation of a car, natural wear and tear of parts is quite possible and the vacuum booster is no exception.

Before you go to the service center or repair the VUT yourself, you need to identify the signs of a part malfunction.

Signs of a malfunction of the vacuum brake booster of the VAZ 2114

Brake booster malfunctions have several fatal negative consequences:

Significant reduction in vehicle control during braking cycles. In the absence of the amplifier, the load on the gas pedal increases proportionally - the pedal goes hard, and the braking effect is significantly reduced. For an unprepared driver, such behavior of the car can come as a shock and lead to a traffic accident due to the increased braking distance; If the brakes malfunction, a car loses significant braking potential and becomes practically uncontrollable;
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The gas pedal is slow. When moving, the pedal is very difficult to press. This is a clear sign of a malfunction of the amplifier housing diaphragm chamber. In this case, the car must be operated with great care, since it has lost a certain effectiveness of the braking system;
A sign indicating a faulty brake system lights up on the dashboard at short intervals. This symptom may also relate to other malfunctions in the brakes, but in combination with a tight brake pedal it clearly indicates a faulty booster. The electronic unit of the car constantly monitors all systems for operability (and although on the VAZ 2114 model this unit has not been considered modern for a long time with its functions, it copes with its functions at a good functional level and with high efficiency despite the small number of sensors);

Deterioration in the braking performance of the system, along with other signs, indicates a direct involvement of a faulty brake booster in the risk of an accident. This symptom is the main one among all the others; however, operating a car with a very weak brake system is very dangerous - the circuits in this case do not receive additional force and cannot effectively brake.

Troubleshooting most often involves replacing the faulty element with a new unit - this will save repair time, since resuscitation of an old product will require no less time and a slightly lower cost of parts. That is why car enthusiasts most often resort to complete replacement of a failed part.

Diagnostics

To check your car for leaks, you can use the ELM327 scanner, you can read how to do this here. This scanner is capable of diagnosing your car and indicating whether it has this malfunction. But, checking with a scanner will not always be a reference, since the leak may be insignificant and the ECU simply may not notice it.

It is best to check the suction using the old proven method, or rather several, which are given below.

First way

It is necessary to unscrew the mass air flow sensor from the air filter housing. It is secured with two 10mm key bolts. We take out the mass air flow sensor and start the engine.

With the internal combustion engine running, we close the sensor hole with our hand or a bag, the car should stall and the intake corrugation should shrink. A vacuum is created in the engine, which, in the absence of air leaks, will persist for a long time and the corrugation will remain compressed.

If the corrugation on your car instantly expands or does not shrink at all, then this indicates the presence of suction.

How to check the vacuum brake booster of a VAZ 2114

The process of checking the vacuum brake booster on a VAZ 2114 is as follows:

Press the brake to the floor 4-5 times with the engine not running. This will create uniform pressure in the two parts of the amplifier. When you press the brake, the valve will immediately show itself: if it squeaks, then you need to seriously think about it.
After the pressure has become uniform, start the fourteenth. But at the same time you need to keep the brake to the floor. If everything is in order with the brake booster system, the pedal will rise after the engine starts. If this does not happen, then repair is definitely required.
In the event that you realize that there is a problem with the amplifier, you need to look to be sure how the hose is secured and what condition the flange is in. If the fastenings at any point do not correspond to the norm, this may affect the fact that the pedal does not lift, and in fact the fault will be on a separate incorrect fastening, and not on the entire system as a whole.

Operating principle

Golden rule: before you begin to restore or replace any unit or component, you should study its structure and operating principle.

The vacuum amplifier has the following operating principle:

when the driver presses the pedal all the way, at that moment the piston and the pusher move, opening up free space between the two sections of the device;
the vacuum section moves into the formed space, taking all the air;
the air presses on the damper located between the elements of the amplifier, which provokes a pressure difference in the two parts;
rod and valve - shift due to the resulting pressure difference;
all elements return to their original positions when the pedal is lowered.

Any decision regarding plans to repair or replace an amplifier must be fully justified.

To do this, it is necessary to inspect the mechanism, which most car owners can do on their own.

Vacuum brake booster VAZ 2114 - which is better, selection criteria

In order to choose the best vacuum brake booster for the VAZ 2114, I recommend that you pay attention to the following points:

Price. Price is one of the most important criteria for choosing a vacuum amplifier. You should not buy cheap Chinese options in order to save money, since they will not last long. It is advisable to give preference to products in the mid-price category - not the most expensive, but not the cheapest.
Package. This packaging, used by a genuine manufacturer, is made by Point of Sale. You should not buy goods from market traders. There are plenty of good, trusted auto parts stores in any city. Ask to see certificates and documentation for the parts.
Label. The label should be clearly legible - the date of production of the part, the production batch number and the name of the manufacturer. I am made of corrugated cardboard.

Replacing the vacuum brake booster of a VAZ 2114 - step-by-step instructions

To replace the vacuum brake booster of a VAZ 2114 you will need a certain set of tools and materials. It includes:

Screwdriver Set;
Pliers;
Socket wrench for 13 and 17 millimeters;
Special wrench for brake pipes;
New plugs;
New fittings.

And so let’s begin the replacement process itself:

Removing the vacuum booster can be difficult due to the brake cylinder. Therefore, we advise you to remove it first. Another option is to disconnect the pipes from the brake cylinder and move them to the side for a while. Here you decide for yourself what is more convenient for you.
The cylinder is not the main problem. It is difficult to cope with the mounting of the vacuum booster. It's just not very convenient to do this. This is the design of the VAZ 2114.
Start with the valve - remove the hose fasteners from it, remove the support bush, after which you can pull out the brake pin.
Next, using a 13 mm wrench, all four fasteners of the vacuum booster are dismantled.
After all the inconveniences of the work done, you can remove the element and get ready to install a new amplifier in its place.
To do this, you will have to install a special mounting frame. The frame is tightened with a 17 mm wrench, after which the new component is installed inside the car.
If you want to make your work as easy as possible, do not forget to first connect the brake pedal to the booster with your finger when reassembling it. After this, it is much easier to cope with putting the vacuum seal back into place.

When replacing the vacuum booster, be sure to change the old vacuum hose at the same time. This element is far from eternal, therefore, as it wears out, it will negatively affect the quality and efficiency of the new vacuum cleaner.

Article: 2108-3510010-01, additional articles: 21080351001001

Order code: 003503

This model of vacuum cleaner has proven itself in the automotive market.

Applicable in the following cars:

Samara / VAZ 2108, 21081, 21083, 2109, 21093, 21099. Also used: Samara / VAZ 2113,2114,2115 Niva / 21213.

When purchasing a VUT (vacuum brake booster), you need to consider the following:

1. VUT must be equipped with a valve.

2. Look at the year of manufacture on the pusher fork, there is also the DAAZ marking.

3. When the pusher stops and the VUT is pressed. the latter should not poison the air.

4. No visible mechanical damage to the body.

During installation, do not forget to apply sealant between the brake master cylinder and the VUT.

Here is a video on how to replace the VUT:

The vacuum booster, using vacuum, creates additional force on the brake pedal. A malfunction of the VUT not only worsens the braking dynamics of the car, but can also cause interruptions in engine operation. Replacing the vacuum brake booster, as well as checking for faults, can be done by yourself.

Why does the vacuum brake booster of the VAZ 2114 hiss?

The car's braking system is subjected to constant loads, and with the so-called sporty style of city driving, it is also subject to overloads. This happens regularly even with a measured and leisurely rhythm - there is no escape from this problem.

Therefore, this unit must be regularly tested to ensure maximum driving safety for the driver and passengers. So it is in the story with vacuum brake boosters. As a rule, problems in its operation occur due to the failure of a special diaphragm located inside the device . It bursts, cracks, and ceases to perform its duties—to create a vacuum. Sometimes the exhaust valve also malfunctions - it is for these reasons that the vacuum brake booster begins to hiss.

Checking functionality

These instructions for checking the functionality of the vacuum booster will be relevant only for certain models of VAZ cars, ranging from VAZ 2113 to model 2115. Therefore, this technique, without exaggeration, is universal.

Check procedure:

The last (third) point is of no small importance, since often expensive and complex repairs to the amplifier may turn out to be pointless if the culprit of the problem is a poorly secured hose fastening.