That is a lock for the brake anchor pins, attached to the backing plate. It does not have anything to do with the pedal shaft, which is held in place with a bolt.
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix