Federal Register Notice terminating a rulemaking action in which NHTSA proposed amending the Federal motor vehicle safety standard that establishes requirements for vehicles equipped with air brake systems, The proposed amendment would have required that trucks, buses, and truck tractors be equipped with an automatic means of removing moisture and other contaminants from air brake systems, and would have deleted the current requirement for a supply reservoir since the reservoir's function would be performed by the automatic system.
Moisture and contaminants can cause valves to stick, thereby preventing sufficient air pressure from being delivered to the brake chambers.
NHTSA is terminating this rulemaking action because the agency has decided that it should address this issue through more broadly worded performance requirements that would give manufacturers flexibility to choose the type of air cleaning and drying system appropriate for their new air-braked vehicles. The agency will continue to study the issue with a view to initiate a future rulemaking proceeding for regulating the performance of methods for cleansing and drying the compressed air that supplies air brake systems.
U.S. DOT/NHTSA - Termination of Proposed Rulemaking - Federal Motor Vehicle Safety Standards: Air Brake System
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