I have seen a few of these over the years,and cured a few and wasn't too succesful on others.The 3000's and even the older RDTT's had the master cylinder and slave cylinder combo to release the brake shoes.What would happen is you could adjust the brake to work smoothly in one direction but it would stop violently in the opposite direction.Have had some success with replacing the shoes and drum,but not always.Just wondering if anyone has had, and cured this problem