I have a 2001 F-250 Super Duty 7.3 4X4 automatic, and recently I had to replace the ball joints on the driver side. Since replacing the ball joints, after driving the truck for a while when I apply the brakes It pulls very hard to the right. I Looked at the calliper but it doesn't appear to be sticking and also when I let off the brakes it doesn't pull at all. Any clues asto what this could be? Thanks!