||Don't know how old your post is but if you still need help, here is my experience.
You will have to take off the weights, rim, fender, connecting rod (to pedal), hub (no easy task, use BIG puller), lift hinge bolt, cover and axle, final drive housing (you'll want help with lifting that one), and you'll finally see your brake unit. BE CAREFUL to not drop ANY shims from the mounting bolts. If the whole thing is covered in oil, you will need to replace the axle seal (three more bolts). Seal knocks out to the inside (don't try to pull it out to the outside).
So, back to the brake assembly. If your pad is good, just remove the same amount of shims from all three bolts and replace the assembly and check for proper function. You can disassemble the brake assembly and clean it, it is a VERY simple design (just don't loose any parts). I think the overall engineering stinks, but the up side is you only have to go into it once every 50 years or so.