Air Force One uses a pilot signal from the coach's air brake system to deliver 100%, direct proportional braking. The system is composed of three main components: the Operating Unit, the Actuator and the Coach Air Assembly. The Air Force One Operating Unit mounts under the hood of the towed vehicle, completely out of sight. It houses the vacuum generator for the towed's power assist and also the reserve air supply for the breakaway circuit. The brake actuator is compact, mounting on the brake arm of the towed vehicle and securing to the firewall with just one self-drilling screw. Once installed, the entire system is invisible and always ready for towing with no set up or take down. Air Force One fits all towed vehicle makes and models.