A vehicle has a frame, at least two wheels, at least one front and one rear suspension assembly, at least one of the suspension assemblies including an air spring, an air compressor, at least one air spring valve selectively fluidly communicating the air compressor with the at least one air spring, an auxiliary air output, an auxiliary valve selectively fluidly communicating the auxiliary air output with the air compressor, a control unit electrically connected to the air compressor, the at least one air spring valve, the auxiliary valve, and a vehicle condition sensor. The condition sensor senses an operating condition of the vehicle. The control unit only opens the auxiliary valve to fluidly communicate the auxiliary air output with the air compressor when a predetermined operating condition of the vehicle is sensed by the condition sensor. A method of controlling a pneumatic system of a vehicle is also disclosed.