Patent ID: 8820857

Claim:
An apparatus for preventing parking brake-caused disabling of a vehicle, comprising: at least two vehicle wheel ends, each having a fluid-actuated parking brake release actuator; a parking brake release fluid pressure source connected to each of the parking brake release actuators via respective fluid supply lines; and at least one parking brake release fluid flow control arrangement, wherein each of the at least one parking brake release fluid flow control arrangements is connected to a respective one of the parking brake release actuators via a respective one of the fluid supply lines, and is arranged to permit parking brake release fluid to flow between the parking brake release fluid pressure source and the respective parking brake release actuator when the vehicle is not damaged, and to restrict fluid flow from the parking brake release fluid pressure source through the parking brake release fluid flow control arrangement when parking brake release fluid pressure cannot be contained between the parking brake release fluid flow control arrangement and its respective parking brake release actuator.