By this you mean new wheel cylinders, and axle seals? I have yet to find an all inclusive post detailing what I should do to fully service all the axles.
Well, "inspect" might be a better term. Pull the front wheels off and inspect the wheel cylinders for leakage and rust. Inspect the shoes for remaining pad material, replace if necessary. Inspect for broken or missing brake shoe springs. If they're all fine, no need to replace them.
Also, remove and re-pack the wheel bearings. They will surely need it. A seized wheel bearing on the steering axle could lead to a major accident. When you pull all this apart, you'll be able to tell if the axle seals are leaking. If they're not, then just let it be. Back to the wheel bearings: I did mine by hand. It's easy.
One way to help keep the axle seals from blowing out, is to ensure that your axle vent is clear to breathe. When they get corroded and plugged up, positive pressure builds up in the axle on hot days and hard driving conditions and can cause the axle seal to leak. You're in Florida. It's hot there, I hear.
Finally, inspect and replace (if necessary) the steering knuckle boots. You can see these by getting under the front of the truck and looking at the inside of the wheel. If you have grease flying all over the inside of the tire and you see torn rubber, the boot is shot. The vendors all sell zip-up boots with large, metal zippers that are easy to install. Slather some sealant on the zipper when you zip them up and they'll be fairly water proof.
Here's a great thread that can help you out with the steering axle:
It has been freezing tonight, about 17 F in Dan's workshop. So we put the brake drum in the kitchen in front of the wood stove, the only really heated room in the workshop. It will stay there today and throughout the night. Will not do much, but it will help a bit. The seal goes into the...
steelsoldiers.com
Also, there are some Youtube videos.
@simp5782 made some of them. He *is* the "5-ton Whisperer."
The bottom line is this: It's not a Honda Civic, it's a 5-ton truck with single circuit brakes. I'm not trying to suck the joy out of the hobby but we do have a responsibility to keep the trucks safe or the authorities will jerk us off the road.