The Lisle Corporation Brake Spring Bar, No. 40030, replaces brake shoes on heavy duty tractor and trailer S-Cam brakes. To remove the spring, slip the hook into the retaining spring loop and press down against the axle. The Brake Spring Bar levers action against the axle to eliminate the need for wrenches, pry bars, and screwdrivers. The tool is 18" long with a molded handle for comfort and has a black oxide finish.