The Demco DUO combines air pressure and vacuum to deliver progressive, proportionate braking force to your towed vehicle. This self-contained supplemental brake system uses dual signals—deceleration and coach brake lights—to activate your towed vehicle’s brakes with total control and precision.

Built with no pulleys, catches, or springs, the DUO system is engineered for reliability and long-term durability. Installation takes approximately 30 minutes, and the system includes integrated breakaway protection.

• Progressive, proportionate vacuum-assisted braking
• Requires dual signals for safer operation
• Integrated breakaway system
• No moving parts to wear out
• 5-year limited warranty