A sliding door for a vehicle has a door bracket. A track is mounted along the vehicle and extends to a remote end. A roller bracket is movable between a first position proximate the opening and a second position at the end of the track. The roller bracket includes an articulating arm retained by the roller bracket by a first pivot and pivotally retained at a second end by the door bracket. The articulating arm has a first orientation for rotationally positioning the sliding door toward the closed position and a second orientation for rotationally positioning the sliding door into the open position. Movement of the roller bearing into the second position results in the articulating arm moving from the first to the second orientation. An over-center spring mechanism may maintain the positioning of the roller bracket relative to the sliding door throughout the travel of the bracket.