Keao brake retarder provides high brake energy. Be fitted to trucks,large buses. Much safer, reliable braking for passenger. Keao provides ... to the vehicles ( weight between 15~50tons)Voltage: 24V.Application: Trucks, small , middle and large buses (5~13m length bus)..Safer ... custom solution.Long working life. Brake Retarder-for heavy vehicles(Trucks and Buses )