A brake interface circuit for selectively enabling and disabling the operation of a brake that is actuated by an actuator comprising a brake cylinder and an actuator control valve that is adapted to selectively enable and disable operation of the brake by the actuator, characterized in that: the actuator control valve is adapted to selectively enable and disable a flow of pressurized fluid from the actuator to the brake in response to an application of pressurized fluid thereto; and first and second control valves (56, 60) are connected between the brake cylinder and the actuator control valve, wherein: the brake interface circuit is operable in a first operating mode, wherein the first control valve is in a first position and the second control valve is in a first position so as to enable the flow of pressurized fluid from the brake cylinder to the actuator control valve to cause the actuator control valve to enable the flow of pressurized fluid from the actuator to the brake, and wherein the brake interface circuit is operable in a second operating mode, wherein the first control valve is in a second position and the second control valve is in the first position so as to disable the flow of pressurized fluid from the brake cylinder to the actuator control valve, to cause the actuator control valve to disable operation of the brake by the actuator, thereby disabling the flow of pressurized fluid from the actuator to the brake and wherein the brake interface circuit is operable in a third operating mode, wherein the first control valve is in the second position and the second control valve is in a second position so as to enable the flow of pressurized fluid from the brake cylinder to the actuator control valve, to cause the actuator control valve to enable operation of the brake by the actuator, thereby enabling the flow of pressurized fluid from the actuator to the brake. the actuator control valve is adapted to selectively enable and disable a flow of pressurized fluid from the actuator to the brake in response to an application of pressurized fluid thereto; and first and second control valves (56, 60) are connected between the brake cylinder and the actuator control valve, wherein: the brake interface circuit is operable in a first operating mode, wherein the first control valve is in a first position and the second control valve is in a first position so as to enable the flow of pressurized fluid from the brake cylinder to the actuator control valve to cause the actuator control valve to enable the flow of pressurized fluid from the actuator to the brake, and wherein the brake interface circuit is operable in a second operating mode, wherein the first control valve is in a second position and the second control valve is in the first position so as to disable the flow of pressurized fluid from the brake cylinder to the actuator control valve, to cause the actuator control valve to disable operation of the brake by the actuator, thereby disabling the flow of pressurized fluid from the actuator to the brake and wherein the brake interface circuit is operable in a third operating mode, wherein the first control valve is in the second position and the second control valve is in a second position so as to enable the flow of pressurized fluid from the brake cylinder to the actuator control valve, to cause the actuator control valve to enable operation of the brake by the actuator, thereby enabling the flow of pressurized fluid from the actuator to the brake. the brake interface circuit is operable in a first operating mode, wherein the first control valve is in a first position and the second control valve is in a first position so as to enable the flow of pressurized fluid from the brake cylinder to the actuator control valve to cause the actuator control valve to enable the flow of pressurized fluid from the actuator to the brake, and wherein the brake interface circuit is operable in a second operating mode, wherein the first control valve is in a second position and the second control valve is in the first position so as to disable the flow of pressurized fluid from the brake cylinder to the actuator control valve, to cause the actuator control valve to disable operation of the brake by the actuator, thereby disabling the flow of pressurized fluid from the actuator to the brake and wherein the brake interface circuit is operable in a third operating mode, wherein the first control valve is in the second position and the second control valve is in a second position so as to enable the flow of pressurized fluid from the brake cylinder to the actuator control valve, to cause the actuator control valve to enable operation of the brake by the actuator, thereby enabling the flow of pressurized fluid from the actuator to the brake.