Vacuum booster

Vacuum booster: It uses the force generated by the pressure difference between the vacuum negative pressure of the engine intake pipe and the atmospheric pressure to assist braking, which can reduce the driver's "labor intensity". After the engine is turned off, you can step on the brakes a few times to turn off the power assist. Then step on the brakes again, and you will find that even with all your strength, you can't push the brakes any further. Without power assist, driving is really physical labor~! This is why the engine must never be turned off while the car is moving. Once the engine is turned off, the power assist will be gone, the brakes will fail, and the hydraulic power steering will also fail. Think about it, how terrible it is to be unable to turn the direction or stop the car~!