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