The barometric brake system is the most familiar power servobrake system. It iscommonly used in the medium-duty truck and heavy truck.
气压动力制动是最常见的动力制动系统，多用于中重型汽车。
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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.