This SAE Recommended Practice provides instructions and test procedures for air braked vehicles including but not limited to trucks, truck-tractors, trailers, dollies, and buses used on highways but does not include off-highway vehicles. Purpose This document provides a method of determining the air reservoir capacity of highway type vehicles using compressed air to actuate or transmit actuation power to the foundation brakes. Air reservoir capacity is the ability to provide adequate brake pressure after a number of brake applications.
Updated test pressure from 120 psi to 135 psi to reflect the higher pressure systems being used today. Changed “Highway Type Vehicles” to “Truck and Bus” per T&B Council instructions. Changed “Commercial Vehicle” to “Truck and Bus” in SAE J1609 title to follow T&B Council instructions. Changed the wording in Paragraph 5.1.10 to be the same as 5.2.8 for consistency.