Line Lock Picture

Has anyone ever seen a line lock like this? It was on my Dart when I bought it, but I never put it back on. I was told by the previous owner that it was form some heavy truck application. This was wired into the brake peddle with the lead comming out of it. He told me I think that it would activate when pressing the brake hard, then it would release when he gently tapped the peddle once again. Does that sound like it would work.. If not what could I wire it to? A 12V powered switch and cycle it on and off?

dart.jpg