本规范提供了根据获得的数据计算制动额定值的试验程序和方法，这些数据用于GVWR超过4.5 T（10 000 lbs）的公路商用车辆空气和液压制动器。通过这种方法确定的制动额定值与通过车辆试验（如SAE J880中所述）获得的制动额定值之间可能存在一些一般相关性。通过执行本规范计算的制动额定功率kW（hp）是根据本程序进行试验时制动器和制动鼓性能的任意指标，可能与通过其他技术获得的值有明显不同。 本SAE推荐实施规程的目的是提供一种方法，用于在惯性式制动测功机上进行试验时，根据制动器和制动鼓的能量吸收和耗散能力确定制动器额定值。

The code provides test procedures and methods of calculating a brake rating from the data obtained for brakes used in highway commercial vehicles over 4.5 T (10 000 lbs) GVWR air and hydraulic. Some general correlation may be expected between brake ratings established by this means and those obtained from vehicle tests such as outlined in SAE J880. The brake rating power, kW (hp) calculated by conduct of this code is an arbitrary index of performance of the brake and drum when tested by this procedure and may be appreciably different from the values obtained by other techniques.The purpose of this SAE Recommended Practice is to provide a method for determining a brake rating based on the energy absorption and dissipation capacity of the brake and drum when tested on an inertia-type brake dynamometer.