grinding on the left rear tire

Estimated friends:
I write to you again to guide me, my 2002 trailblazer vehicle was stopped several months due to machine repair, what I am going to be that by the fact of being stopped so long surely the hand brakes were stuck so it made noise, because of this it takes away the pills that are in the rear drums, the noise is removed, but now a new grinding is heard. The shooters, the question is how the repair costs and whatever each bearing cost. I await your attentive answers what I thank you with an above