After an accident it is often necessary to check the brake push rod stroke adjustment and pneumatic integrity of the brake system of a truck or bus. In many instances, due to the traumatic accident damage, the brake system may not be able to be tested/checked by the conventional means. Test methods used at the scene of an accident may compromise or influence the brake stroke adjustment levels. A tool has been developed which eliminates these issues. This tool, when used to test air brakes (push-rod stroke) on a heavy truck or bus, will eliminate the common problems and difficulties that occur during brake stroke adjustment testing in a post-accident situation. • Checking brake push rod stroke with improper air pressure levels; • System leaks creating measurement inaccuracies; • Parking brake release issues; • System interruption due to traumatic accident damage. By using this tool an engineer can determine the brake push rod stroke adjustment level or diagnose a system failure in an efficient and nondestructive manner, by minimizing the alteration of post-accident conditions.