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Reliability, Maintainability, and Durability of Heavy Truck ABS Systems
Published November 04, 1991 by National Highway Traffic Safety Administration in United States
Efforts in the 1970's to require that U.S. heavy vehicles be equipped with antilock braking systems (ABS) were unsuccessful, in part, because of truck user concerns about the in-service operational reliability and serviceability of the systems. As a necessary pre-step to reconsidering a requirement for ABS, the National Highway Traffic Safety Administration began, in 1988, a large in-service field evaluation of current-generation ABS systems in order to determine if they would function reliably in U.S. trucking operations. Reliability and serviceability has been tracked on 200 ABS-equipped truck tractors, operated by seventeen fleets in six U.S. cities for a two year period beginning in late 1988/early 1989. Beginning in late 1990, 50 ABS- equipped trailers were added to the program. These will also operate for a two-year period. Maintenance records and specially designed on-board monitor/recorder systems have been used to monitor system operation. Data from the recorders indicates the ABSs function more frequently than might have been expected and that the frequency of operation increases, as would be expected, during the winter months. Driver acceptance of the systems has been favorable. Maintenance information collected to date indicate that if quality control of the ABS and its installation in the vehicle is kept high, and if good maintenance is available, from a reliability and maintenance perspective, ABS can be successfully installed and maintained on U.S. heavy vehicles
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