Mine had the same problem too. My back breaks wouldent stop me but I had fluid and quite a bit of pad left.
This may sound stupid, but the problem was with my front brakes they were down to the metal. And most of your primary stopping power lies in the front breaks . your back breaks alone do not have alot of stopping power and if you notice you cant lock the wolvie up by your back breaks alone, they slow you down but coming down a hill your wheels still roll. I replaced my front and everything was back to normal.