Rationale: This document will establish a laboratory test procedure for determining the static friction of a brake lining utilizing a specific brake drum. The intent would be to compare the static torque of this specific combination with both the draw-bar data from an FMVSS121 vehicle test using the same friction material and brake drum, and another dynamometer test using the same friction material, but a different brake drum. Meeting dynamometer FMVSS121 requirements along with equivalency of the dynamometer static torque for the same friction material but with different drums will allow for the drums to be considered to be interchangeable
