The CJ5s had a rubber pad on the clutch and brake;
https://www.kaiserwillys.com/product...ts-55-67-cj-5/
The following diagram shows all the bushings for the clutch/brake linkage. It's pretty straight forward rebuild;
https://www.kaiserwillys.com/diagram...ol-55-71-cj-5/
I would tighten that clutch linkage up 56'. It will give you headaches in adjustment if the components are worn. Replace or repair anything that will cause you lost motion.
Like gm said, the rubber pads showed up on the pedals later. They were bare steel in the old ones.
Two possibilities for a run away pedal:
1) if the brake pedal moves side to side or rotates, you can fix that the low buck way. If the tightening the bolt for the pedal doesn't solve the issue, then you can pull the pedal out and weld up the notch in the pedal stem to take up any slop where the through bolt goes through. This will keep your pedal from running away from your foot.
2) the cross shaft for the clutch and brake is flopping on the bushings on the frame or the transmission side. If this was the case, then both pedals would wonder around.
On mine everything was worn out. I pretty much had to replace everything in the linkage. The worn out clutch linkage explained some of the damage I found in the transmission from grinding gears!