Electric brake control box.I had one on a 1966 3/4 ton truck just like that one.I want to say it had a copper line that ran to a T in the master cylinder brake line.I don't think it had very many wires to it,but I can't remember.
Tim
1951 3100 Chevrolet1951 Chevrolet Suburban CarryallImage"A house is built with boards and beams. A home is built with love and dreams."
"Look deep before you leap !!!" / "Everything is Everything"
"If I say a mouse can pull a house, hitch him up"