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[freakinbox]

Yeah try cleaning those, but if it persists replace the calipers. my front right used to lock up a lot when I first got the car for some god unknown reason. It seemed to correct itself, but if I had the money at the time I would have just bought a new set of calipers.

When you put the pads on did you also make sure both springs that sit on top of the calipers were both there? Wouldn't cause drastic pulling but will cause a bit and also cause the pads to wear uneven and very quickly.