FIELD: transport; maintenance of vehicles. SUBSTANCE: offered method comes to measuring two parameters: time during which air pressure rises to 95% of its asymptotic value and value of piston travel in pneumohydraulic booster. To cut down time, increase accuracy and facilitate diagnosing process, parameters are measured in two check points with preset rate of cutting in of brake valve, without unsealing of drive hydraulic portion. For realizing the method, special diagnosing device has been developed which includes braking automatic device and electronic instrument with pressure and travel transmitters. EFFECT: reduced time taken for diagnosing, increased accuracy and facilitated process of diagnosing. 2 dwg
