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Almost: the brake(shoe) return springs do exactly that: pull the shoes back against their regulators, after braking. While at rest, those return springs do nothing to keep those cups expanded. That is what I would try if the replacement cups you can get had the lips chamfered, to more or less...

That is not correct: in any case, when you step on the brakes it is the fluid under pressure that forces the lip of the cup against the cylinder wall and makes it seal. The extra part you see on the right are cup expanders, yes, but the only force applied to them- with brakes applied or...