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There are some rare brake line internal failures which can trap pressure in the caliper and cause drag. It is simple enough to find out if that particular caliper is dragging and then diagnose from there. It could also be a problem with the ABS, stuck return valve or something.
If that caliper is dragging check and see if the drag goes away if you open/close the bleeder on that corner and comes back again if you operate the brakes.
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1987 928S4
1992 968 cabrio
2009 957 Cayenne GTS
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