A parking brake system including one or more pressure transducers that monitor a fluid pressure of the parking brake system , the parking brake system comprising: a brake selection device configured to indicate the parking brake system is either in an engaged state or a disengaged state; a parking brake valve configured to maintain the fluid pressure of the parking brake system ; one or more processors in electronic communication with the brake selection device and the one or more pressure transducers ; and a memory coupled to the one or more processors , the memory storing data comprising a database and program code that, when executed by the one or more processors , causes the parking brake system to: receive a one or more brake signals indicating the parking brake system is being placed into the engaged state; in response to receiving the one or more brake signals, monitor the one or more pressure transducers to determine the fluid pressure of the parking brake system ; determine the fluid pressure of the parking brake system is less than a threshold pressure; in response to determining the fluid pressure of the parking brake system is less than the threshold pressure, command the brake selection device to indicate the parking brake system is in the disengaged state; and characterized in that the program code, when executed by the one or more processors , causes the parking brake system , in response to receiving the one or more brake signals, to instruct the parking brake valve to move from an opened position into a closed position. a brake selection device configured to indicate the parking brake system is either in an engaged state or a disengaged state; a parking brake valve configured to maintain the fluid pressure of the parking brake system ; one or more processors in electronic communication with the brake selection device and the one or more pressure transducers ; and a memory coupled to the one or more processors , the memory storing data comprising a database and program code that, when executed by the one or more processors , causes the parking brake system to: receive a one or more brake signals indicating the parking brake system is being placed into the engaged state; in response to receiving the one or more brake signals, monitor the one or more pressure transducers to determine the fluid pressure of the parking brake system ; determine the fluid pressure of the parking brake system is less than a threshold pressure; in response to determining the fluid pressure of the parking brake system is less than the threshold pressure, command the brake selection device to indicate the parking brake system is in the disengaged state; and characterized in that the program code, when executed by the one or more processors , causes the parking brake system , in response to receiving the one or more brake signals, to instruct the parking brake valve to move from an opened position into a closed position. receive a one or more brake signals indicating the parking brake system is being placed into the engaged state; in response to receiving the one or more brake signals, monitor the one or more pressure transducers to determine the fluid pressure of the parking brake system ; determine the fluid pressure of the parking brake system is less than a threshold pressure; in response to determining the fluid pressure of the parking brake system is less than the threshold pressure, command the brake selection device to indicate the parking brake system is in the disengaged state; and characterized in that the program code, when executed by the one or more processors , causes the parking brake system , in response to receiving the one or more brake signals, to instruct the parking brake valve to move from an opened position into a closed position. <EOS>