Product Code:SAE J1609 Title:Air Reservoir Capacity Performance Guide - Trucks and Buses Issuing Committee:Truck And Bus Brake Supply And Control Components Committee Scope:This SAE Recommended Practice establishes performance guidelines of the air reservoir systems usedon trucks, towing trucks, truck-tractors, trailers, and converter dollies, with GVWRs over 10 000 lb, designed to be used onthe highway.NOTE: Compliance with this document does not guarantee compliance with the air reservoir requirements of FMVSS 121.