The reprints of AC manuals are better than the I&T manuals which cover a lot of different tractors. The AC manuals only cover one model.
As for the brake pins. If they won't come out probably the best way is to drill and tap the end. Maybe get the wheel off the tractor to make room, drill as straight as possible. You will have to grind maybe 1/16" off the end of the pin to get through the case hardening. Drill and tap 3/8" fine or 24 thread. It is stronger and the tap may turn a little easier than a corse thread. Make the thread deep enough to get by the neck in the pin or you will probably pull the end of the pin off. Don't worry about going fairly deep, the pin is long and unless you go maybe more than 1 1/2" deep you won't go past where it is spported by the casting. Do not break the tap, be careful, take your time. Drill and tap as straight as possible. Use a grade 8 or socket head cap screw to pull the pin using a short section of pipe or a socket and washers as a puller. Add height as you need to as the pin comes out. Hammering the pin in may help to break it free even though you are going the wrong way. Don't worry about having ground the end off the pin, you will now have a threaded hole in the end where you can put a capscrew and washer when you put it back in. Asways put these in with grease or anti-seize. Maybe you will be lucky and the pins will come out without all of this. If they do I would drill and tap the ends before you put them back in so the next timethey have to come out it will be easy. If it isn't you who has to do the job next time the guy who does will thank you and think how smart you were for having done this.