Vacuum servo brake真空伺服制动器;真空补充制动器;真空伺服煞
vacuum hydraulic brake液力和低压联合制动
fluid vacuum power brake液压真空加力制动器
vacuum power brake unit真空增力制动器
vacuum boost brake真空加力式制动器
Vacuum power brake真空动力制动;[机] 真空机动闸;真空机动闸
vacuum towing brake line真空拖引制动器管路
vacuum towing brake hose真空拖引制动器软管
N（名词） a brake system, used on British and many overseas railways, in which the brake is held off by a vacuum on one side of the brake-operating cylinder. If the vacuum is destroyed by controlled leakage of air or a disruptive emergency, the brake is applied. It is now largely superseded by the Westinghouse brake system 真空制动器