I have been maintaining a sterling lt 8500 tri axle for a while now and the boss has been complaining about the brakes not releasing when the lift axle is coming up causing the tires to skid when cornering. Does anyone know where I can find a air system schematic, or point me in the direction of the suspect valve or control. There should be something that cuts service air to brakes immediatly when axle lift is initiated. Please help tires are taking a beating. thanks in advance