You cannot "spin" the wheels with the axles in the car - the diffs are still connected.
The easiest test is to go for a drive, them measure disk and caliper temps, using an infrared thermomter. A dragging caliper will be obvious from elevated brake temps. - compared to the other side.
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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
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