Cat 416 C. Any time the right brake is used, the brake will not release. Usually I can continue to run a little, but then feel the brake tightening more until it finally will not allow the backhoe to move. Then it just becomes a waiting process. Sit and wait. After a while the brake releases. It has been an issue for a while. I just talked to my neighbor and he mentioned the exact same thing is happening on his Cat 420C. What could cause this?