Truck? What sort of truck? The brake cross shaft shown in your photos is for a '33-'34 passenger car or commercial vehicle (including pickups), but not for a big truck and it appears to be complete and original. The spring on the shaft in your photo is primarily for the retraction of the mechanical brake rods and only secondarily for the retraction of the brake pedal, which has a spring (see #11 above) attached to it directly. Nothing in your photos has anything to do with the retraction of the clutch pedal, which has its own retraction spring.