Considering the work to get to them and the relative low cost, it would be a cost/labor benefit analysis. Shoes often fail from age. Either chunks of lining fall or or linings completely come off. Attached is what happens when hold down hardware fails and no one does PMCS.
I would put brake...
Well, if you're going to be in there, might as well replace brake shoes linings and hold down and return hardware. I would be sure to save some of the removed hardware for emergency trail repairs. My used bearings get cleaned, inspected, repacked and sealed in ziplocks or mylar.
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