I know, I've actually replaced it and the flex line to it before and it went right back to doing this. I'm going to do all four corners with rotors, calipers, and flex lines when I tear it down this winter. I tow daily in traffic and trailer brakes never work correctly for more than a few weeks. But on the positive side I've replaced pads with the Duralast forever warrantied pads probably 15 times and they are actually holdovers from the truck I sold to Troy! same brake pads and Autozone never questions it!