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We take the vacuum booster pump assembly, including vacuum booster, with the vacuum booster connect braking main cylinder, vacuum booster after the assembly, including former housing assembly, control valve and the shell, before the diaphragm assembly, and after the shell by diaphragm assembly, and control of shell in the body cavity D before and after cavity C, brake main cylinder shell, assembly and through before the vacuum booster cavity, D before the cylinder shell with brake assembly between before sealing device. This utility model, compact structure, convenient installation, decorate with improved reliability in, Good seal performance, to avoid the shell gas seal for braking is active in the deformation caused by leakage phenomenon, vacuum improved braking effect.