My passenger side did the same thing after installing my Hotchkis springs last summer. I was so proud of myself after installing my drop and went to drive for the 1st time and after 10 - 15 min. I started smelling something burning and then my brakes started going to shit and all the sudden I had smoke! I carefully drove home and took the wheel off and decided to bleed that caliper and all has been fine since. Old brake lines make since, I had been manhandling the calipers.