On my Silverback, they were hard right from the time we bought it new. This past summer the black water tank valve stopped working completely. We were 2000 miles away from home and the RV place out west told us it was the valve that needed replacing. It would take two weeks to get one in. We would be on our way home by then. I used an end of the line valve and the RV place was able to open the black water valve. Anyway when we got home I took it to the place where we bought it and they said it was the cable that was bad. They also replaced the cable to the grey water valve. While out west I unhooked the cable from the L bracket and was able to pull maybe 6 feet of cable. Why it was/is that long is beyond my reasoning. Shorter ones were installed tho'. My dealer mechanic said it was the outer sheath on the cable that caused the problem.