Same with mine, Martin-
If folks are still on original caliper pistons after 45 years, chances are there's some corrosion, chances are the pistons are dragging while trying to retract.
Best-
George
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When mine did this, I had corroded pistons. I rebuilt the calipers with pistons from Bench Mark Works.They were half the price of OEM and have performed flawlessly. FYI. Thanks, Vech!