Become helping hand than vacuum booster , braking system and vehicle

The utility model relates to a vehicle field provides a become helping hand than vacuum booster, braking system and vehicle. Wherein, it includes than vacuum booster to become the helping hand: the booster casing, be provided with diaphragm assembly in the booster casing and pass the output push rod that diaphragm assembly extends, the tip of output push rod is provided with the elasticity reaction plate, with the input push rod, the input push rod stretches into in the booster casing and connect in the air valve body, the air valve body have be used for with the plunger portion that the elasticity reaction plate contacted, plunger portion with the area of contact of elasticity reaction plate follows plunger portion with the increase of the pressure between the elasticity reaction plate and increasing. The change helping hand than the starting stage of vacuum booster in the braking, can shorten the footboard stroke relatively and build the pressure stroke, optimize brake master cylinder and build and press th