Cushman rear brakes . Remove the cotter pin and nut.
The hub will sometimes come off easy .
Pick with Wheel cylinder removed . If you have bolts for the new ones and the the ones on the machine are rusted badly just chisel them off .
Original problem was under the floor pan the debris builds up and rots the brake line going to the rear wheel . You can splice in a new piece to the master cylinder or replace the whole line . I had a real good time trying to free up the bleeders to get the air out after wards . I managed to get them loose with out snapping them off , The bleeders were pretty badly chewed up . I had to get new ones later .