High performance vacuum booster for automobile braking

The utility model relates to a vacuum booster with high performance for the braking of an automobile, which comprises a casing, wherein a valve body which causes an inner cavity of the casing to be divided into a front cavity and a back cavity is arranged in the casing, and a passage which is used for communicating the front cavity and the back cavity is arranged on the valve body; one side of the inner part of the valve body is provided with a push rod, a push plate, a sealing diaphragm and a push plate positioning spring are arranged on the push rod, and the end part of the push rod is fixed with a top block; the other side of the inner part of the valve body is provided with a top rod, one end of which is fixed with a buffer block and a gap a between the top block and the valve body is increased to 2 mm to 3 mm. The buffer block at the end part of the top rod is made of elastic materials, and adopts a circular arc shape with a convexity at an end surface. The vacuum booster is applied to an automobile braking system, the braking performance of the automobile, particularly a car, is improved obviously, the speed is 30 kilometers per hour, and the braking distance is from 2 meters to 3 meters, namely, the automobile can be stopped within the range from 2 meters to 3 meters. The vacuum booster not only causes the braking distance to be shortened and the brake performance to be reliable, and the lock and the side slip can not be generated.