UH-Oh ive got a brake thats stuck

[krazy_texan]

Ok so i go to pump gas in my truck today and when leaving the pump i notice it is a bear to get to move like i had a brake locked up I have had this issue 2x before but it always broke free or felt like it did atleast and then i went on well i get home and i am looking around the truck at some other things and i notice smoke coming from the passenger side so i pop the hood thinking this could be an engine problem but its not upon further inspection i find it to be coming from my front right drum now. This sucks now i am going to have to get outside in the cold and the wind and figure out what is going on. does anyone have any clue what could cause a brake to do that i am looking on ideas maybe what to look for specifically but then again it could just jump out at me when i pull the drum. who knows i have never had this happen to me before so any input would be appreciated guys.