A flat tow brake, sometimes known as a dinghy towing brake system, is an essential equipment for safely flat towing a vehicle behind an RV or motorhome. It works by applying the brakes on the towed vehicle when the brakes in the RV are applied. There are various types of flat tow brake systems, but their primary function is to ensure the towed vehicle slows down and stops in sync with the RV, enhancing safety during towing.