They may just need to be adjusted. They should have self adjusters but they could be stuck, froze up. The adjusters work when applying the brakes in reverse. Back down the driveway and hit the brakes hard several times, that may free them. If not, time to pull the drums and see what's going on inside.
The brakes typically don't grab has hard in reverse as they do in forward. The lining on one shoe is smaller than the other. Not positive but I believe that allows the shoes to pivot more in reverse and actuate the self adjuster. Also means it won't grab as hard in reverse.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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