This SAE Recommended Practice establishes methods to determine grade parking performance with respect to: a. ability of the parking brake system to lock the braked wheels; b. the trailer holding or sliding on the grade, fully loaded or unloaded; c. applied manual effort; d. unburnished or burnished brake lining friction conditions; and e. down and up grade directions. This document establishes a uniform procedure for determining the parking performance on a grade of any new trailer with manufacturer's maximum weight rating of more than 4500 kg (10 000 lb) intended for roadway use.