From what I understand, this is common when a car of our flavor sits. I need to replace both front calipers on mine. They stick more than they should, but the car is drivable.

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1998 VW Cabrio
2001 Audi SomeRoad A/T (no air suspension)
2003 Audi DeadRoad M/T (no vroom, for later)
2002 Audi NoRoad A/T (nothing under the hood, being rebuilt)