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If it was a frozen caliper, you would have had pulling on the steering wheel when applying the brakes. Same if there was grease on the disk.
It is most likely that the calipers are not sliding smoothly in the caliper mounts, or that the pads are hanging up slightly and dragging. A proper brake job that includes looking at how clean all the slides are should be sufficient.
While you could dive into the calipers, I would wait to see if they push back smoothly before doing anything more on them. If you have been changing the brake fluid every two years as per the maintenance schedule, you should be fine; if not, you have reason to suspect the calipers.
Also, it is entirely normal for the curb side brakes to wear out somewhat faster than the other side, as there is often grit and dirt on the side of the road that the tires pick up and which contribute to the wear. This isn't common in the southern (warmer) states, but it is common anywhere that sand and gravel get applied to the road in winter (Washington state qualifies).
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
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