The Dependable Care brakes must be lubed or they will hang up. You can use a thick gear oil, it only takes a teaspoon or so to lube the break. Also, I know you stated the drive lug is adjusted correctly. Might want to check it again to make sure you are not at the furthest end of a good adjustment. Sorry, I don't have access to SM's. If you do, look up an A9700 and look at lubing the brake. You run the pulley up to release it, then put a small amount of oil in the gap created. Then running the pulley up and down several times disperses it.