Just wondering if anyone had experience adjusting the rear brake on this model. I took the right wheel off and then the drum. Brake pads are very thick doesn't even look to worn, but there is no brakes at all when you hit the pedal. There doesn't seem to be any adjustment that I can see either ...both rods aren't threaded. This tractor has been in my family since new and we've been mowing without brakes for about 20 years.