A new type of servobrake which provides a increased brake torque by a roller and a wedge structure, whose advantages are its ideal force on brake shoes and even wear, has been developed.
Because of its simple structure, good braking performance and good serviceability, duo-servo drum brakes are widely used as light vehicle central parking brake systems.
自动增力鼓式制动器因其结构简单、制动性能优良、维修方便，被广泛应用于轻型汽车的中央驻车制动系统。
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A duty valve drove hydraulic brakeservo system of HEV (hybrid electric vehicle) power transmission test rig is studied.