主题文件专门针对常用于额定车辆总重（GVWR）超过4536 kg（10000磅）的机动轮式车辆的驻车和/或紧急制动器（仅限）使用的行车制动器和行车制动器。主题规范提供了用于客观确定战术和作战地面轮式车辆制动系统和选定辅助项目制动组件（又名售后市场或备件）适用性的非车辆程序、方法和过程，包括主题文件中明确规定的仅用于商业应用的制动“块”。主题规范主要基于使用制动惯性测功机的已知工业和军事测试标准。目标车辆和部件包括但不限于: a、 民用、商用、军用和军用商用地面轮式车辆，如货车、职业车辆、卡车牵引车、拖车，以及地面车辆“干式”制动系统（GVDBS）总标题下的专用支持和工程设备。 b、 液压、空气和机械“干式”盘式制动器和鼓式制动器系统，当用作行车制动器时，包括行车制动器（仅限），当用作紧急和/或停车制动器时。 c、 液压、空气和机械“干式”盘式制动片总成和转子总成。 d、 液压、空气和机械“干式”鼓式制动蹄总成和制动鼓总成。 e、 用于上述a.至d.的液压、空气和机械制动器“制动块”，但专门为军事用途采购和/或根据ATPD-2354测试的车辆、制动片总成和制动蹄总成除外。必须注意的是，美国政府的军事部门只购买总成，通常不使用“制动块”和更换的制动蹄/刹车片；因此，原作者明确将使用单独制动“块”的试验排除在ATPD-2354之外。

Subject document is specifically intended for service brakes and service brakes when used for parking and/or emergency brakes (only) that are commonly used for automotive-type, ground-wheeled vehicles exceeding 4536 kg (10000 pounds) gross vehicle weight rating (GVWR). Subject specification provides the off-vehicle procedures, methods, and processes used to objectively determine suitability of tactical and combat ground-wheeled vehicle brake systems and selected secondary-item brake components (aka, aftermarket or spare parts), including brake "block" for commercial applications only, specifically identified within subject document. Subject specification is primarily based on known industry and military test standards utilizing brake inertia dynamometers. Targeted vehicles and components include, but may not be limited to, the following: a. Civilian, commercial, military, and militarized-commercial ground-wheeled vehicles such cargo trucks, vocational vehicles, truck tractors, trailers, and specialized support and engineering equipment under the generic heading of ground vehicle "dry" brake systems (GVDBS). b. Hydraulic, air, and mechanical "dry" disc brake and drum brake systems, when used as service brakes, including service brakes (only), when used as emergency and/or parking brakes. c. Hydraulic, air, and mechanical "dry" disc brake pad assemblies and rotor assemblies. d. Hydraulic, air, and mechanical "dry" drum brake shoe assemblies and drum assemblies. e. Hydraulic, air, and mechanical brake "block" when intended for use on a. through d. above, except for those vehicles, pad assemblies, and shoe assemblies specifically procured for military use and/or tested under ATPD-2354. It must be noted that the U.S. Government's Military Services buys only assemblies, and doesn't normally use "brake block" and relined brake shoes/pads; therefore, testing using separate brake "block" was specifically excluded from ATPD-2354 by the original authors.