What happens if the brakes have a leak? What happens when you step on the brakes and the master cyli

There is a reason for air leakage when you step on the brakes:

1. There are two kinds of sounds similar to air leakage, one is made during the process of stepping on it, and there is no sound if you step on it without lifting it。One is to step on the bottom without raising your foot and continue to emit it. The first should be the sound of the main pump core and the booster pump moving, and there is nothing wrong with that.

2. Of course, it depends on the brake fluid you change.

is not qualified. The second problem is the sound of the power pack leaking. Repairs are required, and the booster assembly is replaced.

3. But the booster leakage is not a matter of one or two days, it must have been there before, but you didn't notice it. Judging method: You can step on it after extinguishing the car without lifting your foot, and see how long your foot is pushed up. If it's going to be quick (within 10 seconds), it's an air leak and must be fixed.

Precautions for brake use.

When you find that the car in front starts to brake (the brake light is on), put your foot on the brake pedal, evenly afterburner, smoothly decelerate to the speed of the car in front of you, keep the brake pedal position, and then observe the speed change of the car in front and adjust the braking strength. If the speed of the vehicle in front does not decrease, you can slowly release the brake pedal and accelerate forward, continuing to follow the car at the same speed as the vehicle in front.

In the event of an emergency, the brake pedal must be quickly applied.

Step on the ground until the danger is removed. First of all, you must be calm enough at this time, and you must not be overly nervous and overwhelmed. At the same time, the movement must be fast enough, the strength must be fierce enough, and the brakes must be applied with all your might.

Hello, the reason for the brake leakage: 1. One is emitted in the process of stepping on it, and there is no sound when stepping on it without lifting it, it should be the sound of the main pump core and the booster pump moving. 2. One is to step on the bottom without lifting your feet and continue to emit it, which may be that the booster bag is leaking and needs to be repaired and replaced.

It's not that there's a problem with the braking system, it's the sound of the vacuum booster.

The working principle of the vacuum booster is to use the pressure difference between the negative pressure generated by the engine and the atmospheric pressure to force the rubber diaphragm inside the supercharger to move. When the brake pedal is pressed, the vacuum hole of the rubber diaphragm cavity of the supercharger is closed, and at the same time the air hole is opened to let outside air enter, because the air pressure in the cavity is greater than the air pressure in the other cavity, the rubber diaphragm is forced to move, and.

There is a problem with the brake booster pump. The brake booster pump, also known as the brake booster pump, controls the real air entering the booster pump to make the diaphragm move, and uses the push rod on the diaphragm to assist manpower to press and push the brake pedal through the intermodal device, thereby amplifying the pedal force.

It could be that there is a problem with the brake booster pump. The brake booster pump is to control the vacuum entering the booster pump during braking, so that the diaphragm moves, and uses the push rod on the diaphragm to assist manpower to step on and push the brake pedal through the intermodal device, so as to amplify the force of the driver's pedal.

If there is a leak in your car's brakes, then it is a very dangerous thing, it must be a faulty brake system, and you should go to a car repair shop for timely repairs.

Brake leakage is the poor sealing of the brake, and you have to repair it as soon as possible.

If the brake is found to have an air leak, it is more dangerous, and it is best to repair it as soon as possible.

It's possible that there is an air leak underneath you. It is recommended to go to the lathe to have a look.

First check the four-circuit protection valve, then check the relay valve, and finally check the brake master cylinder, whether the brake leaks or not, and whether there will be air leakage elsewhere when the brake is stepped on. If there is no air leakage when you step on the brakes elsewhere, then the brake master cylinder valve core is worn, resulting in air leakage.

Pneumatic brake master cylinder:Composition: The pneumatic brake master cylinder is mainly composed of an upper chamber piston, a lower chamber piston, a push rod, a roller, a balance spring, a return spring (upper and lower chambers), an upper chamber valve, a lower chamber valve, an air inlet, an air outlet, an exhaust port, and a ventilation hole.

Working principle: when the driver steps on the pedal, one end of the pull arm is pressed down by stretching the pull rod, the balance arm is moved down, the exhaust valve is closed first, the intake valve is opened, and the compressed air of the air reservoir is filled into the brake chamber through the intake valve, and the diaphragm of the air chamber is pushed to rotate the brake cam so as to realize the wheel braking, so as to achieve the braking effect.

If there is no air leakage when the brake is not pressed, it means that the seal between the air intake, i.e., ports 11 and 12 and the exhaust port, is good. After the brake is pressed, the main cylinder leaks, indicating that there is a problem with the sealing between the outlet 21 and 22 and the exhaust port, so the air leaks, because when the pedal is pressed, theoretically the inlet 11 and the outlet 21 are passed, and the inlet 12 and the outlet 22 are connected, and the four ports and the exhaust port are closed at this time.

1. Start the engine for 1-2min after turning off, and press the brake pedal several times with the commonly used braking force, if the stroke is larger for the first time, and the subsequent stroke is reduced one by one, it means that the vacuum booster is working well, if there is no change in each stroke, it indicates that the vacuum booster or vacuum pipeline is leaking and should be repaired;

2. When the engine is not running, press the brake pedal several times with the common braking force to confirm that the pedal stroke remains unchanged, and then keep the brake pedal in the position of stepping down to start the engine, if the pedal height drops slightly at this time, it means that the vacuum booster is working well;

3. Press the brake pedal when the engine is running, then turn off the engine and keep the pedal in the depressed position, after about 3os, if the pedal height does not change, it is well sealed, if the pedal has a phenomenon of picking up, it indicates that the vacuum booster is faulty.

It didn't work to replace the new master pump, and it didn't solve it after checking for more than an hour.

The brake master cylinder is the main part of the hydraulic brake, which has a tank for storing brake fluid above and a piston in the cylinder below. The piston is in the cylinder by the brake pedal and then through the push rod to act, the brake oil pressure in the cylinder is transmitted to each wheel cylinder, which is also a hydraulic brake device, and the brake cylinder is arranged in each wheel.

The relay valve is broken and needs to be disassembled for repair.

The overlapping of hand and foot brakes in the actual driving process generally occurs in:

First, it is when the brake is needed while driving without putting down the hand brake.

Second, it is the incorrect operation of emergency braking in extreme cases; Then there is when the hand brake is stuck in a drifting corner and you need to brake.

The function of the relay valve of the car:

Generally, the differential relay valve is used, and the air outlet is connected to the brake air chamber. Prevent the driving and parking system from operating at the same time, which greatly shortens the inflation line of the brake chamber, so as to avoid the overload of the mechanical transmission element and make the spring brake cylinder charge rapidly, so that the compressed air enters the brake chamber directly through the air intake from the air reservoir.

When the brake pedal is pressed, as in the braking system of a trailer or semi-trailer. The relay valve is used at the end of the long pipeline, and the output air pressure of the brake valve is used as the control pressure input of the relay valve, so that the compressed air of the air reservoir quickly fills the brake air chamber under the action of control pressure.

In the braking system of a truck, instead of flowing through the brake valve, the intake valve is pushed open, which accelerates the process of inflating the air chamber. Therefore, the relay valve is also called the acceleration valve, and the relay valve plays the role of shortening the reaction time and pressure establishment time, and the inlet of the exhaust relay valve is connected to the storage.

When the hand brake valve is in the "parking brake" position, the hand brake valve continues to leak from the exhaust port, which is generally caused by the valve inlet valve and the valve seat are not tightly closed, or there is a foreign object between the valve and the valve seat, or the intake valve seal is damaged. It can be solved by replacing the intake valve seals with a repair kit.

During the parking brake, the hand brake valve will not cause other faults. However, when the handle of the handle of the hand brake valve is set to the "driving" position, the hand brake valve leaks, which will cause the rear axle wheel to "tighten" when the car is moving. This is generally caused by the loose closure of the contact between the stem of the hand brake valve and the air valve.

Obviously the reason that causes this exhaust port to seal is not tight may be the damage of seal, or because of the separation of foreign matter or oil between valve stem 7 and air valve 10, the exhaust port is not tightly sealed. Dismantling and inspection Clean or replace the intake valve seal, and the fault can be eliminated.

When the car is in the parking brake condition, the relay valve leaks, which will not cause failure to the car, which is obviously caused by the damage of the intake valve seal of the brake valve or the foreign matter or impurities between the valve and the valve seat, so that the valve is not tightly closed. When the car is in the driving state, the relay valve continues to leak from the exhaust port, which is obviously that the exhaust valve and the piston are not tightly closed, which will make the air pressure of the spring energy storage brake chamber insufficient, resulting in the failure of the driving brake "tightening".

The car handbrake is loose and the air leakage is particularly bad, what is the problem? It was a one-way valve that was activated by the pneumatic hand brake, and the leaking leather bowl was broken. It is necessary to start the vehicle to pump up in order to use it normally, otherwise there is no brake, which is a pneumatic brake commonly used in large cars.

The reasons for the abnormal sound when braking may be:

1. The brake pad material is too hard. When the metal material particles in the brake pads are very hard or relatively large, when the driving vehicle is on the brakes, the brake pads will make abnormal noises after rubbing against the brakes.

Of course, this situation generally does not appear in the brake pads on the original car, which is basically caused by the owner replacing some inferior brake pads in the later stage. The brake pads will not only wear out the brake disc too quickly, but also affect the braking performance of the vehicle.

2. The brake pads are worn unevenly. In the process of using the vehicle, it is inevitable to pass through some muddy waterways, and these muddy water often cause the brake parts of the vehicle to work poorly, such as brake cylinder pistons, brake cylinder pins and so on. Due to the poor working of these components, the brake pads and the brake disc cannot be fully fitted, resulting in unevenness.

Therefore, when we step on the brakes, we will naturally hear the abnormal sound of brakes, and I believe that the owners who have replaced the new brake pads have had such an experience, which is caused by uneven wear of the brake pads and brake discs.

If there is a leakage sound when braking, it is very likely that the brake system is faulty, and it can be repaired in time.

Hello car owners! Are the brakes heavy when the brakes are applied? If the brakes are heavy, it should be that the vacuum booster is damaged.

1. The hand brake valve is leaking

When the hand-made Xiangqiao moving valve is placed in the "parking brake" position, the hand brake valve continues to leak from the exhaust port, which is caused by the valve inlet valve and the valve seat are not tightly closed, or there are foreign objects between the valve and the valve seat, or the intake valve seal is damaged. It can be solved by replacing the intake valve seals with a repair kit. During the parking brake, the hand brake valve will not cause other faults.

However, when the handle of the handle of the hand brake valve is set to the "driving" position, the hand brake valve leaks, which will cause the rear axle wheel to "tighten" when the car is moving. This is due to the fact that the stem of the hand brake valve is not tightly closed in contact with the air valve.

Obviously the reason that causes this exhaust port to seal is not tight may be the damage of seal, or because of the separation of foreign matter or oil between valve stem 7 and air valve 10, the exhaust port is not tightly sealed. Dismantling and inspection Clean or replace the intake valve seal, and the fault can be eliminated.

2. The filling time of the hand brake air reservoir is too long

Before the car starts, the main brake cylinder should first be fully pressed. Warning light goes out, buzzer.

A stop indicates that the main brake (front brake pump and (middle) rear brake cylinder) has sufficient pressure, and if the hand brake valve is put in the "driving" position, the hand brake has low air pressure.

When the warning light is on, it means that the air pressure of the hand brake cylinder is insufficient, and the spring brake compartment has not completely released the brake.

At this time, the car starts forcibly, and the (center) rear axle produces a brake "tightening" phenomenon. Therefore, the warning light needs to be turned off before the car can start.

Precautions for the use of car handbrake.

1. Forget to let go of the handbrake at the start, which often appears in the novice car owner, which is the most harmful to the handbrake, before starting to see whether the handbrake indicator light on the dashboard is still on, do not light up and then start.

2. Many car owners will feel that the tighter the handbrake, the better, this is the wrong operating habit, and pulling the handbrake in a very tight state for a long time will make the handbrake spring easy to deform, which will greatly affect the service life of the handbrake.

1. Disassemble and clean, check whether the air closure valve is damaged, and add some butter to install it.

2. Installing gas circuit filters on the two air pipes entering the main pump can solve the situation that the main pump is always leaking, and you can buy a repair kit of the same type of main pump.

3. It should be the total pump leather bowl leaking, just change it, and the cost will not exceed 20 yuan. The leakage of the main pump bowl must be replaced immediately, which is very harmful.

4. If it is an air leak and then it becomes larger, the friction force when braking.

It will start to fall, and it is very likely that all of a sudden there will be no hail and the brakes will collapse the sails.