yea those pics are after the brake cleaner. should have said that bc it totally looks oily as hell in there haha.
Get ready, if you get them working they might start sticking then. Very aggravating. I have a little bit later 480c with the hydraulic brakes, but it looks the same as yours on the inside. That band grabs that "donut" and the donut expands and swells up it's width and rubs the sides of the transmission and the housing you took off. There are little balls inside the "donut" that reside in little ramps. When the band outside stops the donut from turning, the transmission keeps trying to turn it and the balls ride up the little ramps and expand the donut. All well and good, but when the brake linings get oil on them, they get sticky. You can clean then all you want but it doesn't help. The donut will swell up and stick, and the only way to unstick it is to put the tractor in reverse.
I have one other trick up my sleeve I am going to try , and that is a torch to carefully heat the linings to drive the oil out. I have done this before on other tractors and it seemed to work ok, but it's a smokey stinky mess. If that doesn't work, I will have to break down and buy new linings. As you found out, brakes are important in hill country. It's nice to set the parking brake and be able to get off the tractor without having to bury the hoe or the bucket all the time.