I've been on since 2011 when I got my B7100, I post very rarely. But I am here a lot, I noticed over the last 3 weeks my brakes were stuck, doesn't really impact the tractors moving but I thought I should look into it. Left side was fine, right side was stuck, I could pull the pedal back but the rod would just bow. It was just like Vic said rust in the mechanism, I tried penetrating oil but it did nothing.
Off with the wheel, off with the fender, pull the cover off and there in my had are the shoes and the rusted lever. Rip it all apart, clean the rust off, lube everything, back together and works like a champ. Less than an hour, and probably 50 cents worth of shop supplies.
I get a lot out of the older posts here and just wanted to thank Vic and the others that post here for all the great information.