This SAE Recommended Practice establishes uniform test procedures for air brake systems pneumatic valves with respect to: a. input-output characteristics; b. leakage measurement; c. low temperature evaluation; d. elevated temperature evaluation; e. corrosion resistance evaluation; f. endurance testing; g. structural integrity; h. vibration testing. This document establishes uniform accelerated laboratory test procedures for evaluating comparative performance characteristics of pneumatic valves designed to operate in 931 kPa (135 psi) nominal air brake systems. These tests are based upon current industry practices.