This Recommended Practice provides a road test procedure for truck-tractors@ to evaluate their compliance with Federal Motor Vehicle Safety Standard (FMVSS) 121; Air Brake Systems. Units of measure are English in lieu of metric to be consistent with FMVSS 121.
SAE J1626-1-2009 history
2009SAE J1626-1-2009 Recommended Practice for Braking@ Stability@ and Control Performance Test Procedure for Air-Brake-Equipped Truck-Tractors