Patent ID: 7354118

Claim:
A pneumatic brake system, comprising: (a) at least one pneumatic brake device; (b) at least one source of pressurized air; (c) a control valve system, wherein the control valve system further comprises: (i) at least one control valve in fluid communication with the at least one pneumatic brake device and the at least one source of pressurized air, the at least one control valve including a movable valve member and a signal inlet port; (ii) a control device in fluid communication with the control valve for controlling the operational state of the at least one control valve; (iii) wherein the control valve changes from a first operational state to a second operational state and applies the at least one pneumatic brake device when a first positive pressure signal, applied to the signal inlet port from the control device, moves the movable valve member to a first position; and (iv) wherein the control valve changes from the second operational state back to the first operational state and releases the at least one pneumatic brake device only when a second positive pressure signal, applied to the signal inlet port from the control device, moves the movable valve member to a second position.