Brake pumps are divided into master pumps and sub-pumps. First of all, check the sub-pump. Generally, the fault of the sub-pump is oil leakage. As long as there is no oil leakage, there is generally no problem. Then there is the master pump. When you step on the brake pedal, keep the pedal should not fall down. If it falls, the master pump will be relieved. After the flame is turned off, the brakes will be increased continuously. The brakes will increase. It will be harder. When the brakes are applied and the engine is started, the brakes will soften back to the position. This is the way the main vacuum pump works normally. The pump is better. The jack is checked. The wheel, one person turns, one person can brake to know if the pump is good or bad.
EV Brake Assist System is an important part of the brake system. Its performance and damage to components will directly affect the safety of the car. Therefore, the performance and failure of the vacuum booster should be checked in time, and the vacuum booster to be repaired or replaced should be properly adjusted. In order to facilitate the inspection and adjustment methods, the structure and principle of the vacuum booster should be understood first.
EV Vacuum Brake Booster Kits
Structure and principle of EV Vacuum Brake Booster Kits
It is mainly composed of a piston, a diaphragm, a return spring, a push rod and a joystick, a check valve, an air valve and a plunger (vacuum valve), and the type thereof is a single diaphragm vacuum suspension type. The vacuum booster is installed between the brake pedal pushrod and the master cylinder to provide assistance for the vehicle brake. When not braking, the diaphragm in the booster is suspended in a vacuum and is balanced by the vacuum of the A and B chambers and the return spring. When the driver steps on the brake pedal, the brake pedal lever pushes the plunger to the left.
At the same time, the air valve also moves to the left under the spring thrust, so that the diaphragm A and B chamber passages are closed and the air valve is opened. At this time, the A cavity on the left side of the diaphragm is still vacuum, and the B cavity on the right side of the diaphragm passes through the atmosphere, and a pressure difference is generated on both sides of the diaphragm, forcing the diaphragm piston to move to the left, and the increased force is exerted on the pushrod. On the brake master cylinder piston, this is a boost for the driver. When the brake is released, the brake pedal force disappears, the return spring presses the diaphragm back to the equilibrium position, and the joystick moves to the right. At this time, the air valve is closed, the vacuum valve is opened, and the A and B chamber passages are connected, and the diaphragm is again on both sides. Have the same degree of vacuum.
The brake assist vacuum pump utilizes the principle of inhaling air when the engine is working, causing one side of the booster to be vacuumed, and a pressure difference is generated with respect to the normal air pressure on the other side, and the pressure difference is used to strengthen the brake thrust. Even if there is only a small pressure difference on both sides of the diaphragm, due to the large area of the diaphragm, a large thrust can be generated to push the diaphragm to move toward the end of the pressure.
In the working state, the pushrod return spring causes the brake pedal to be in the initial position. At this time, the check valve of the vacuum tube and the vacuum booster is in an open state, and inside the booster, the diaphragm divides it into a vacuum gas. The chamber and the application chamber are connected to each other, and most of the time they are isolated from the outside, and the chamber is connected to the atmosphere by means of two valve devices.
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