I think my rear right caliper might be locking up sometimes. It only happens once in a while when I drive and I get out of the truck I smell burning brake pads and r/r wheel becomes very hot. I think I should just replace caliper unless there's something else I can do to fix that.

 

I would suggest replacing the Caliper, they are cheap to replace really. If the problem consists, then I would look into a blocked or pinched line. I would more so be leaning towards sticky Caliper in my opinion.