What does the Audi brake vacuum booster pump do

The brake vacuum booster pump is driven by the intake camshaft, and there is a strip isolation plate inside the pump, which generates a vacuum by changing the space, and the interface of the pump has a vacuum check valve. The internal mold of the vigorous drum is sucked by the vacuum degree to achieve brake assistance, reduce the hardness of the brake pedal, and improve the brake sensitivity.

The role of automobile brake cylinder:

1. After pressing the brake, the main cylinder causes thrust to press the hydraulic oil to the sub-cylinder, and the piston inside the sub-cylinder begins to move under hydraulic pressure to push the brake pads;

2. The oil brake is composed of a brake master cylinder and a brake oil storage tank. They have the brake pedal attached to one end and the brake hose to the other. The brake master cylinder is stored with brake fluid, and there are oil outlets and oil inlets. When the brake is applied, the oil outlet is open and the oil inlet is closed;

3. Under the pressure of the piston of the pump body, the brake oil pipe is squeezed out of the oil pipe and flows to each brake cylinder for braking function. When the brake plate is released. The oil outlet in the brake master cylinder will be closed and the oil inlet will be opened, so that the brake oil will flow back from each brake cylinder to the brake master cylinder and return to the original state.

Brake resistance assisted. When the vacuum pump is normal, the brake pedal is easy to press. Effectively automatic. It's the same as power steering in cars.

The vacuum booster pump uses the principle of inhaling air when the engine is working, causing a vacuum on one side of the booster pump, and the pressure difference is relative to the normal air pressure on the other side, and the pressure difference is used to strengthen the braking thrust. When the engine is turned off, the manual pedaling force required for braking becomes large because there is no assistance, but the brakes are still there. Since they are all vacuum booster pumps, Audi's also plays this role.

The vacuum booster pump can keep the vacuum for more than a week. After stopping and turning off, as long as you don't step on the brakes, there will be power in the brakes, and if the vacuum booster pump is well sealed, the power will be retained for a long time. When the car was first bought, it was able to stay for more than a week, but now it is gone overnight.

1. The vacuum of the brake is generally in two places, one is to take the vacuum directly from the intake manifold (the air pressure of the intake manifold is smaller than the atmospheric pressure, especially in the process of high-speed pumping), and the other is the vacuum pump of the vehicle itself.

2. If the vacuum pump finds that the vacuum degree of the brake is not enough, it will immediately work to evacuate. The loss of vacuum means that the vacuum system is not sealed and communicates directly with the atmosphere.

The brake booster pump uses the principle of inhaling air when the engine is working, causing a vacuum on one side of the booster, which produces a pressure difference relative to the normal air pressure on the other side, and uses this pressure difference to strengthen the braking thrust. Even if there is only a small pressure difference between the two sides of the diaphragm, due to the large area of the diaphragm, a large thrust can still be generated to push the diaphragm towards the less pressure end.

In the working state, the push rod return spring makes the brake pedal in the initial position, at this moment, the check valve of the connection position between the vacuum tube and the vacuum booster is in the open state, inside the booster, the diaphragm divides it into the vacuum chamber and the application chamber, these two chambers can communicate with each other, both are isolated from the outside world most of the time, and the air chamber and the atmosphere can be connected by having two valve devices.

When the engine is running, the brake pedal is pressed, and the vacuum valve is closed under the action of the push rod, and at the same time, the air valve at the other end of the push rod is opened, and when the air enters (the cause of the panting sound caused by pressing the brake pedal), the air pressure in the cavity will be unbalanced.

Under the action of negative pressure, the diaphragm is pulled towards one end of the brake master cylinder, and then the push rod of the brake master cylinder is driven, which realizes the function of further amplifying the leg force.

Press the brake pedal with your foot, and then get into the car, the pedal does not move after the car, indicating that there is a problem with the vacuum booster, open the tube on the vacuum booster to see if there is a feeling of suction, if there is a booster that is broken, if not, the booster pump is broken (for diesel cars), diesel cars have a separate vacuum booster pump. The torque of hitting the steering wheel before and after hitting the car is the same, indicating that there is a problem with vacuum assistance. If you are a professional player, you can find the vacuum tube, start from the vacuum degree of the vacuum tube, if there is a vacuum degree, then the possibility of the booster pump not working is very high.

When we press the brake, if we feel that the texture of the brake is obviously hard, and the stroke of each pedal is very small, and even push your foot back, it is likely that the brake vacuum pump is leaking, resulting in the failure of the vacuum pump's power booster. At this time, we can turn on the engine for a few minutes and turn it off, if you don't press the brake pedal to hear an obvious air leak, then it means that the vacuum pump is indeed leaking and needs to be replaced in time. Additional Information:

If the brake pedal is pressed and the pedal is neither raised nor resistant, it is what we call the phenomenon of brake not returning. At this time, we need to check whether the brake vacuum pump, master cylinder or sub-cylinder parts are damaged. Secondly, it is possible that there is a lack of brake fluid or an oil leak.

It is necessary to find out the cause in time and prescribe the right medicine. The brake vacuum booster pump uses the principle of inhaling air when the engine is working, causing a vacuum on one side of the booster pump, and a pressure difference is generated relative to the normal air pressure on the other side, and the pressure difference is used to strengthen the braking thrust. When the brake pedal is pressed, the vacuum valve A is closed, and the air valve B at the other end is opened (the air enters the rear cavity), and a pressure difference is formed when the air enters.

Then under the action of this negative pressure, the diaphragm will be pulled towards one end of the brake master cylinder, thereby driving the push rod of the brake master cylinder, so that the driver has a pedal feeling.

1.According to the external abnormalities of the car during work, the method of logical inference is used to diagnose the type and location of the fault, so it is also called the fault tree method (see Figure 1-1) or the diagnosis table method.

However, this method must rely on the long-term accumulated experience and repeated observation of maintenance personnel, which is cumbersome and inaccurate, and often misdiagnoses and delays.

2.Utilize various testing instruments and equipment to obtain various data of automobiles, and judge the technical condition of automobiles according to these data, which is called detection and diagnosis method. At present, the instruments and equipment available are:

Multimeter, ignition timing lamp, cylinder pressure gauge, vacuum gauge, oil pressure meter, sound level meter, flow meter, fuel consumption meter, oscillometer, cylinder leakage detector, crankcase blow-by S detector, gas analyzer, smoke meter, and complete functions of dynamometer, four-wheel aligner, brake test bench, side slip test bench, headlamp tester, exhaust gas analyzer, automobile axle extractor, engine comprehensive tester, chassis dynamometer tester, tire balance tester, etc. These instruments and equipment provide a reliable basis for human fluid banquets, so that the automobile fault diagnosis has developed from qualitative diagnosis to quantitative diagnosis.

3.Utilize the computer itself can quickly monitor the working condition of the control system and the characteristics of the data stored, through a certain operating procedure, the fault code that the automobile computer monitors and stores is extracted, and then prescribes the right medicine, carries out troubleshooting, this method is called self-diagnosis method and buries the qin. This method is very effective and fast and accurate for all major systems of the electronically controlled car.

4.Car computer fault diagnosis instrument (commonly known as decoder), it itself is a special small computer, it can extract all kinds of information collected and stored by car computer, (ECU), and then sort, compare and translate, display it in a clear text, curve or table mode, people can judge the type of fault and the location of the fault according to the information transmitted out. It can also send commands to the car computer for static and dynamic diagnostics.

This is one of the most promising diagnostic methods.

Whenever you open the hood at the front of the car, you can see the brake booster. It is a black round, tin box-like device with a vertical grip at the rear of the engine on the driver's side. Many cars use drum brakes for the rear wheels and disc brakes for the front wheels.

Drum braking does not necessarily have to be assisted by a noisy brake booster, as it has an automatic tensioning function. However, disc braking must be assisted by a brake booster device in order to obtain the required braking power.

Yes, sealing is required. Because it is the vacuum chamber inside, if it leaks, it will leak, causing the engine to idle unstable or high, and the brake vacuum is not enough to help.

The function of the brake auxiliary vacuum pump is to increase the braking force of the brake pedal and complete the braking of the vehicle, and the vacuum pump will be used in the braking system of the vehicle, and the vacuum pump is mainly composed of the pump body, rotor, blades and intake and exhaust ports.

The function of the brake auxiliary vacuum pump is to increase the braking force of the brake pedal and complete the vehicle braking, the vacuum pump will be used in the braking system of the vehicle, the vacuum pump is mainly composed of the pump body, rotor, blades and intake and exhaust ports and other parts, and the role of the brake auxiliary vacuum pump is to increase the braking force of the brake pedal and complete the vehicle braking, the vacuum pump will be used in the braking system of the vehicle, and the vacuum pump is mainly composed of the pump body, rotor, blades and the inlet and exhaust bucket chiator and other parts of the tank installed on the girder, and the driver's side Fix with the screws that hold the iron oil pipe. This one is 90 centimeters. If the transfer case bracket is installed, 50 cm should be used.

After installing the vacuum tank, if the engine turns off unexpectedly, you can also have a few brakes, which is definitely a life-saving equipment in the off-road field or other special road conditions! It is hoped that the road conditions in mountainous areas such as Yunnan, Guichuan and the brothers who often go off-road will install one. Even on normal paved roads, because of the large enough vacuum in the system, the braking force is uniform and sufficient braking power is guaranteed.

Photo by Pacific Automobile Network Q&A).

There is no damage, the brake booster pump uses the principle of inhaling air when the engine is working, causing a vacuum on one side of the booster, and the normal air pressure on the other side produces a pressure difference, and uses this pressure difference to strengthen the braking thrust.

Even if there is only a small pressure difference between the two sides of the diaphragm, due to the large area of the diaphragm, a large thrust can still be generated to push the diaphragm towards the low pressure end of the pie.

In the working state, the push rod return spring makes the brake pedal in the initial position, at this time, the check valve at the connection position between the vacuum tube and the vacuum booster is in an open state, and inside the booster, the diaphragm divides it into a vacuum chamber and an application chamber, which can communicate with each other and are isolated from the outside world most of the time.