Funny you should mention this problem. My '65 does the exact same thing. The vacuum booster was recently replaced with a rebuilt unit by the previous owner (from looking at it, it's clearly a reconditioned unit). Would the return spring be replaced as part of that rebuild? I noticed what appears to be a return spring on the brake pedal under the dash. Is that the spring you are referring to? Are they available new? I don't recall seeing such a spring listed in my couple of T-bird parts catalogs, but I'll take another look.
Thanks for the heads-up. I was just living with lifting the pedal with my foot whenever the brakes started to drag. I'm glad it may be an easy fix.
Joe
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