Vacuum booster is mainly composed of vacuum servo air chamber and control valve
The vacuum servo air chamber is composed of front and rear shells, and the servo air chamber diaphragm is sandwiched between the two, which divides the servo air chamber into two cavities, the front and the rear. The front cavity leads to the engine intake manifold (ie, the vacuum source) through the vacuum check valve, and the outside air is filtered by the filter ring and the felt filter ring and then enters the rear cavity of the servo air chamber. A control valve is installed in the hub of the rear chamber diaphragm seat. The control valve is composed of an air valve and a vacuum valve. After the structure diagram is partially enlarged, the air valve and the control valve push rod are fixed together, and the control valve push rod is connected with the brake pedal mechanism by the adjusting fork. The diaphragm seat of the servo air chamber is provided with a channel and, the channel is used for connecting the front chamber of the servo air chamber and the control valve, and the channel is used for connecting the rear chamber of the servo air chamber and the control valve. The thrust generated by the vacuum servo air chamber, like the pedal force, acts directly on the push rod of the brake master cylinder.