本SAE推荐实施规程描述了一种标记系统，用于区分行车、停车和组合气制动执行器和部件的长冲程和标准冲程。所述致动器用于通过间隙调节装置施加凸轮型基础制动器。

This SAE Recommended Practice describes a marking system to distinguish long-stroke from standard stroke for service, parking, and combination air-brake actuators, and components. Said actuators are used for applying cam type foundation brakes by slack adjuster means.