A squeaky wheel

I have a rear wheel in my 96 coupe that squeaks like crazy but wheel i apply the brake it stops sqeeking what could that be a berring or does it need to be lubed its driving me crazy please i need some advice on what to do:(
 
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My brakes squeaks only on the rear driver side with and without applying the brakes...I have even replaced the pads that still had a lot of life left on them and they will stop squeaking for about 30min of in-town driving then start again...any ideas of what to do next?