RViBrake 3 - RV Towed Vehicle Braking System NOT WORKING - FOR PARTS OR REBUILD. This is some sort of self-contained brake system or system parts for putting inside a towed vehicle during towing. It depresses the brake pedal at times of braking when the vehicle is being towed. PLEASE NOTE:  As far as I can tell it DOES NOT WORK. I plugged it into my "power port" on my car and it did nothing. I do not know how to make it work.  I do not know if it only works with other parts. It's somewhat heavy. It probably has some heavy parts inside the housing. Sold as is with no return.  Buyer pay $70 shipping to USA states. $200 shipping outside of USA states.