I was wondering if anyone can explain this photo to me. I think it is on Peter Kable's Lamsteed Kampcar, which I also believe is temporarily in Jay Klefoth's museum.
If I'm right about the identity and location maybe someone can take a photo with the floor boards removed so the mystery can be solved.
I have seen this on a speedster a while back.
The 4th pedal was used for aux brakes. The aux brake was applied first. If additional brakeing
was required the 4th pedal came in contact with the ford pedal and applied it.
I took that picture when Peter and Sally came through Tulsa. Peter posts often here, I let him explain.