This is a vintage Kelsey Hayes original automatic electric brake controller for use with 6v and 12v brakes and tow cars. Patent no. Is 2,829,225. Included is the hydraulic brake line if you want or need it. I can't guarantee this works and I don't have a way to try it. My dad saved it so I hope it works. There are spliced wires on it now. 

Thanks for looking.