A hand-lever actuated parking-brake using rear brakes was standard equipment in all size trucks 1947-1950.
- foot-pedal actuated in smaller models
- hand-pedal actuated in larger models
The propeller-shaft hand-brake parking brake was a regular production option RPO-348 on some larger trucks in those years.
From 1950-1955, 4000-6000 series trucks had the hand-lever actuated propeller-shaft parking brake as standard equipment.
It does not look like the prop-shaft was an option on other size trucks in any of those years?
