Your rear brake shoe adjusters have stopped adjusting themselves. The
squeak you hear is the 'travel' of the show rubbing on the backing
plate. You are wearing out your brake system at an accelerated rate
because everything is going out of adjustment.
You need to find a shop that will thoroughly clean and LUBRICATE the
mechanism inside. Don't let them sell you shoes because they often last
forever (unless they can show that they are truly worn out). There's
something like 13 lubrication points inside each rear brake. Read
through this thread to understand the process:
Be aware you're supposed to be adjusting your engine valves every 30,000
miles (or pay the man $3,000).
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