Abstract: A system for controlling the pneumatic brakes of a vehicle that has both a tractor portion and/or a trailer portion. This system includes a first brake module for applying or releasing the pneumatic brakes (i.e., parking brakes and service brakes) located on the tractor portion of the vehicle, a second brake module connected to the first brake module for applying or releasing the pneumatic brakes (i.e., parking brakes and service brakes) located on the trailer portion of the vehicle, a dash-mounted parking brake control module connected to the first brake control module and the second brake control module for controlling the function of the first and second brake modules relative to the parking brakes, and least one source of compressed air in communication with the system for supplying pressurized air to the various modules. A similar system for controlling the pneumatic brakes of a vehicle having only a tractor portion is also provided.