一、国内旧型制动机现状解放前我国客货车辆上装备的制动机绝大部分为美国 Westing-house 系统空气制动机。这些制动机均是二十年代以前的设计产品,在国外因不适应运用要求早就陆续淘汰,其概况如表1。 First, the status quo of the old domestic brake system Before the liberation of China’s passenger vehicles and vehicles equipped with brake most of the Westing-house system for the United States air brakes. These brakes are the design products before the twenties, in foreign countries due to not meet the application requirements have been eliminated one by one, the general situation shown in Table 1.