Is it a front or rear caliper?

Sometimes the VW rear calipers will hang up because moisture gets into the e-brake cable when the e-brake is set and freezes, leaving the E-brake cable tight until it thaws out. And sometimes the cables just stick for no apparent reason... I had it happen to me once after I swapped my VW to discs. Brand new cable, lubed 'er up with graphite, 80 degrees outside, and it still managed to get stuck.