front brake sticking and overheating...need advice

I have a '95 Lumina van w/ ABS, and sometimes my front left brake pads stick shut on the rotor and overheat. Someone told me it was the caliper going bad. I replaced it and things worked fine for two weeks, now the same brake stuck again today. Could there be dirt in the line preventing the fluid from going back up? Thanks for any help.

Could be a bad caliper hose too,collapses from the inside and will cause this problem.

Thanks...I'll check that hose.