Vehicle with parking brake system

A vehicle, comprising:

• a chassis comprising at least one of a transmission or a structural frame;
• a tractive element coupled to the chassis;
• and
• a parking brake system comprising:
• a parking brake configured to brake the tractive element when engaged, wherein the parking brake is configured to be disengaged to permit rotation of the tractive element in response to the parking brake receiving a fluid;
• a fluid supply configured to supply the fluid to the parking brake to disengage the parking brake, wherein the fluid supply is configured to stop supplying the fluid in response to a component of the vehicle ceasing operation;
• a pump coupled to the chassis and configured to supply the fluid to the parking brake at least when the component of the vehicle is not operating;
• an external port configured to be coupled to an external source of the fluid;
• a check valve fluidly coupled to the external port and oriented to prevent the fluid from flowing out of the parking brake system through the external port;
• and
• an input shaft coupled to the pump and configured to drive the pump, wherein the input shaft includes an interface that is accessible from at least one of (a) an exterior of the vehicle or (b) within a cab of the vehicle.

A vehicle comprising:

• a chassis;
• a tractive element coupled to the chassis;
• a steering actuator coupled to the tractive element;
• a parking brake configured to brake the tractive element when engaged;
• a steering pump fluidly coupled to the steering actuator and the parking brake and configured to (a) supply a first volume of a fluid to the steering actuator to steer the tractive element and (b) supply a second volume of the fluid to the parking brake to disengage the parking brake;
• and
• a steering wheel coupled to the steering pump, wherein the steering wheel is configured to drive the steering pump when rotated.

A vehicle comprising:

• a chassis;
• a cab coupled to the chassis;
• a tractive element coupled to the chassis;
• a parking brake configured to brake the tractive element when engaged;
• a pump fixedly coupled to the chassis and configured to supply a fluid to the parking brake to disengage the parking brake;
• and
• an input shaft coupled to the pump and configured to drive the pump, the input shaft being positioned such that the input shaft is accessible from at least one of (a) an exterior of the vehicle or (b) within the cab.