Sounds like you have a caliper dragging and heating up the rotor. Sometimes if you bleed the brakes it will improve, but you are really only buying time.

You could also have a pad that is not seated correctly and dragging. I saw this once, the clip on the pad broke and the pad was jammed to one side.

__________________
- 335i E92 2007 [Sapphire Black/Coral Red]
- X5 E70 2013 [Sparkling Bronze/Cinnamon]
"Living the dream" 1981 Delorean #6489