 The Meillerwagen’s pneumatic brakes drew air pressure from the towing vehicle, and were operated by the tractor driver as an extension of his vehicle’s brake circuit.A control valve handle on the Meillerwagen regulated the braking force it drew from the tractor, depending on whether the Meillerwagen was laden with a rocket or unladen.The Meillerwagen was equipped with two compressed air reservoirs, filled from the towing vehicle.