noise from brakes

when im driving along and presson my brakes snd then left off it makes a loud clunk noise but it doesent happen till i let them off its a 94 with 4wd has any one had this problem before

problem sounds like you may have a caliper either hanging up or a broken bolt. I would look more closely into it by either removing the wheel and chekcing yourself or have a shop that does FREE inspections check it out