As an Electric car A/C Parts Factory, let's share with you the structure of the new energy electric vehicle brake booster pump.
The brake booster pump is a large diameter vacuum chamber. The inside has a diaphragm (or piston) with a push rod in the middle. The cavity is divided into two parts, one part is connected to the atmosphere, and the other part is passed. The pipe is connected to the engine intake pipe. It uses the principle of inhaling air while the engine is working, causing a vacuum on one side of the Brake Booster Vacuum Pump and a pressure difference from the normal air pressure on the other side. This pressure difference is used to enhance the braking thrust. If there is even 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. The vacuum assist system controls the vacuum entering the Electric Brake Booster pump while braking, moves the diaphragm, and uses the pusher on the diaphragm to assist the man to step on and push the brake pedal.
Brake Booster Vacuum Pump
Therefore: when the engine is turned off because there is no intake vacuum, there is no boost, and the artificial force required for braking will be large. It should be noted here that there are many newcomers who think that if the engine is turned off, there is no brake. This is not right. The correct thing is that the engine is turned off, and the manual pedaling force required for braking becomes very large without assistance.