Hey Ricardo, I know your pain. I have gone through and replaced all my wheel cylinders and lines on my 40. Gets expensive but brakes are kind of important.
I opted to stick with my drums rather than do the disk swap. The cost of cylinders pales when you start looking into replacing calipers, disks, etc.
If you decide to go that route, there's a guy selling a 60 front axle:
I could use the third for my 60, so if you were interested in getting it, I would throw in. Let me know.