I have a 2006 F250 SD, 6.0. I purchased it less than 2 years ago with 32000 miles. When I first got it, the RR caliper was hanging, A few days later the LR caliper started hanging. Still under the 60day warranty, the dealer replaced both calipers with new, not rebuilds. 7 months later, 40000 on the clock, the LR hung briefly a few times. A week or so later the RF caliper got hung and stayed there. Local shop replaced the flex lines at all four brakes, both front calipers New, not rebuilds, new pads and rotors, and flushed the system with new fluid. Here I am, 11 months later 47000 miles on the clock now and the LR caliper is hanging again. I am thinking something may be wrong with the ABS unit. This is getting expensive for a truck I don't drive that often, but I really enjoy it! Any ideas? Have there been any TSB's regarding this issue? Thanks for any input