Roadmaster InvisiBrake is a revolutionary innovation in supplemental braking. With InvisiBrake there's nothing you have to do to connect and disconnect it. There's nothing to take in and out of your towed vehicle, and there's nothing to push, pull, set, adjust, activate, or deactivate. Nothing could be easier. InvisiBrake is a fully automatic supplemental braking system that uses the electrical connections already in place on your towed vehicle (the towed vehicle's electrical harness) to brake when you brake the motorhome â the same electrical signal that activates the towed vehicle's brake lights also activates InvisiBrake. Completely Out of Sight â InvisiBrake is so small (8" x 8" x 2") it can usually be mounted under the driver's seat, under the rear seat, behind interior panels, or in the trunk, without sacrificing any of the vehicle's usable space. Set-It-and-Forget-It Braking â Once it's installed, InvisiBrake just works. There's nothing for you to remember â not even an on switch. Just plug in the umbilical cord like you always do and you're ready to go. Charges Your Battery While Towing â InvisiBrake connects directly to the towed vehicle's battery and trickle-charges the battery during towing â InvisiBrake will never drain the battery. Two-Stage Motorhome Monitor â InvisiBrake includes an LED monitor for a visual reference of braking activity; an audible alert at the motorhome will warn you if the brakes have been on for too long. Activates Only When the Motorhome Brake Lights Illuminate â No false braking. Energizes Your Power Brakes â Most braking systems work on a 'dead' brake pedal. InvisiBrake energizes your power brakes so that you have the same power braking system while towing as you do while driving. Works in Virtually Any Towed Vehicle with Vacuum-Powered Brakes â Including hybrids and those with 'active' (or 'continuous power assist') braking systems. Includes an Emergency Breakaway SystemEasily Adjusts to Individual Braking Preferences â Braking pressure is adjustable from 5 to 100 psi. Meets U.S. and Canadian Braking Requirements Always ready to go with set-it-and-forget-it braking Includes LED monitor for visual reference of braking activity Adjustable braking pressure from 5 to 100 psi | Roadmaster 8700 Invisibrake Flat Tow Brake System