Starting in model year 2021, select coaches built on Freightliner Custom Chassis are coming pre-installed with BrakeSync. BrakeSync is a plug-and-play, OEM-installed system that provides braking air for use with supplemental braking systems on towed vehicles. This kit contains everything needed to install an Air Force One in a towed vehicle (including Wireless Coachlink) and connect directly to the BrakeSync fitting pre-installed at the rear of the coach. BrakeSync is the only factory-installed, factory-warranted supplemental braking system available on luxury RVs with FCCC chassis today.