I bet the wheel cylinders are 'stale' and not releasing allowing the shoes to retract. Pull a wheel and a cylinder to see what's up. If the bores are clean then clean up all four wheels and the master, re-bleed and away you go. If pitted and full of crap...you'll know what to do.
Typically it goes the other way after a long sit. You apply pressure at the pedal and the rotten seals or pitting causes a pressure loss.
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