Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
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Rotors should be flat, but the larger they are, there will be some warping to them, so if just slighly off flat, not too much to worry about; but it does sound as though yours may be quite off.
Fot the dragging, as this is a cable system, this could be caused by the cable routing, if the cable goes through some sharp bends this could lead to some drag, see if this can be improved for better response, if the braks is dragging, it indicates that the pads are not releasing, or are always contacting the braking surface, and need to be further away.
Is one of the pad on the rear always in contact with the rotor, and the other a long way away?