This SAE Recommended Practice describes a test method for determination of heavy truck (Class VI, VII, and VIII) tire force and moment properties under straight-line braking conditions. The properties are acquired as functions of normal force and slip ratio using a sequence specified in this practice. At each normal force increment, the slip ratio is continually changed by application of a braking torque ramp. The data are suitable for use in vehicle dynamics modeling, comparative evaluations for research and development purposes, and manufacturing quality control.
The original document made some assumptions regarding future work that have not been met. Additionally, the over-the-road test machine mentioned in the text has been decommissioned and is no longer available. Other required revisions were found during the renewal process. The purpose of these revisions is to incorporate the most correct practices and bring the document up to date in light of developments between 2004 and 2014.