This new slack adjuster is fully compatible with OEM part numbers 1263485 and 1263486.It is a critical brake part installed on the chassis of heavy-duty commercial trucks. It automatically adjusts brake clearance as the vehicle travels.This capability keeps brake reaction quick and consistent during long-distance transport. Built with solid alloy materials and precise machining work, the part delivers dependable wear resistance and stable structural toughness. It strictly follows original factory installation standards, which makes it easy to swap out old or malfunctioning parts directly.