after sitting for a few days, my 4320 acts like the left brake is locked. rocking it causes a popping noise after which it works like normal. thinking i have brake problem, i tried to pull off the final drive to install new shoes, slave cyl. etc. final drive comes out a half inch and no further. i disconnected the parking brake and tapped the rod in toward the brake according to the shop manual. im hoping someone has some ideas, im about out. thanks