Working principle of brake support pump.

The brake booster pump using the engine intake air this principle at work, cause one side of the vacuum booster, relative to the other side of the normal air pressure differential pressure, using the pressure difference to strengthen braking force. Even if there is only a small pressure difference on both sides of the diaphragm, because of the large area of the diaphragm, a large thrust can be generated to push the diaphragm toward the small end of the pressure. Under working condition, the push rod return spring brake pedal in the initial position, at this point, the vacuum tube connected to the vacuum booster position of check valve is in open state, from inside the booster, the diaphragm will be divided into its true air chamber air chamber, and the application can be connected between the two, both in most of the time cut off from the outside world through two valve device can realize the air chamber is connected with the atmosphere. , when the engine is running on the brake pedal, the push rod, under the action of vacuum valves close, at the same time, the push rod at the other end of the air valve is open, after waiting for air into the (on the brake pedal causes of gasps) will cause cavity pressure unbalanced state, under the action of negative pressure, the diaphragm is pulled to the brake master cylinder, push rod, in turn, drives the brake master cylinder, it will realize the function that will further enlarge leg strength.