This SAE Recommended Practice establishes minimum tolerance requirements for pilot operated and mechanically actuated modulating type valves, and through type valves used in the service brake control system when tested in accordance with the test procedure outlined in SAE J1859. This document applies to the nominal input-output characteristics as specified by vehicle original equipment manufacturer and labeled by the valve manufacturer as outlined in SAE J1860. The tolerance requirements will include:
a
Crack (opening) pressure or force. Crack pressure may be measured at the initial output pressure or as the pressure differential before output pressure exceeds 14 kPa (2 psi). Crack force may be measured at initial output pressure or before output pressure exceeds 14 kPa (2 psi).
b
Pressure differential (input-output)
Rationale
J1861 has been reaffirmed to comply with the SAE 5-Year Review Policy.
The Truck and Bus Supply and Control Components Committee of the Truck and Bus Brake and Advanced Driver Assistance Systems Steering Committee is responsible for developing, reviewing, and approving recommended practices, standards, and information reports related to air braked vehicles supply and components and their interfacing as utilized on trucks, tractor-trailers combinations and buses over 4,536 kilograms (10,000 lbs.) GVWR. The activities of this Committee include brake supply and control components and their interfacing, and is not, in any way, to duplicate efforts of any other Committees.
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Air Brake Valve Input-Output Characteristic Requirements
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Air Brake Valve Input-Output Characteristic Requirements
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