I've had a similar problem with another car. I can't remember exactly what it was, but you ought to take off the wheel, and examine the brakes--especially if they are drum breaks (which I doubt).
You might also try to see if there is any play in the wheel when you've got it jacked up. Wiggle the wheel (when it is still bolted on tight), and see if you get any motion. Try wiggling it back and forth, and up and down.
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