Dexter Electric/Hydraulic Brake Actuator for Disc Brake Applications 1,600 psi suitable for disc brake applications. Large reservoir capacity Solid state electronics. Requires a 4-wire hookup Wiring connections: Yellow: cold side of breakaway switch; the wire that goes hot when a break occurs Black: positive connection on breakaway switch; the wire that charges the breakaway battery Blue: output from in-cab controller; the wire that provides power from your brake controller White: ground Requires a minimum 9 amp/hour breakaway kit Dimensions: 11" long x 6" wide x 7" tall Compatible with most electronic brake controllers Meets or exceeds all Department of Transportation (DOT) regulations and federal braking requirements Works with Ford and Dodge factory brake controllers ?Not compatible with Chevrolet factory brake controllers 2 Year limited warranty The yellow wire must be attached to the breakaway unit for it to function when a breakaway occurs