rustystud
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I was going to say wow that looks as in as bad a shape as mine was! Lol. I think you'll be OK if you painted it so long as you got down to bare metal.
On another note I think I found the piece that's the culprit for most Airpack problems. See pics. Not sure what this piece is called but I believe its a valve that controls both the build up and release of the air in the airpack. So like my original problem with the brakes dragging this piece was stuck closed so the air wouldn't release. Just recently I had an issue where I couldn't build up the air pressure in the truck. I went crazy looking for air leaks and then took apart the Airpack and found this piece to be all corroded and suck Open which was just constantly releasing the air.
This is a great find because if your brakes are dragging or can't build up pressure, you can just unbolt this piece while the Airpack is still on the truck. That way you don't have to do a full rebuild to fix your problem!
Well that can be a problem but the most common is the shaft seal leaking into the air-chamber. There is also the problem with the control piston. This is the actual device that controls the air pressure to the booster. It can stick in it's bore due to rust and corrosion.