Why wire up brake "dog bone"?

[SwampLedge]

Early 28. I'm going through the car prepping for reassembly and found this. Since the engine and transmission are from a '31, it's reasonable to assume the wires were put there in preparation for when the clamshell was removed. I'm concerned, though, that this was a field fix to keep it from dropping out in operation. (The vehicle was used on a farm for many years before it found its way to me.)

Any thoughts/relevant experience? Thanks.
Jerry