Question to all that have done the dual piston S 10 Ft. caliper swap. Which flexible line did you use. I installed mine with new S 10 lines and today it came loose, I'm positive it was tight because I was getting some weeping while bleeding and went over it. Seems that turning right or left the line binds and acts like a wrench and loosens the bolt. Someone was watching over me, it failed as I backed off my driveway!