I rebuilt and changed all my calipers... i bled my brakes several times... ive changed my master cylinder and my brake booster. But my front driver side keeps lockin up....? any reason... i was driving for a good 15 min without any issues... then out of no where it locked up...

 

a brake line could be getting pinched off.. did you twist the hoses when you changed everythgin?

 

both hoses are new and i checked them and there not twisted? any other ideaS?