From a pevious post by Tom... .
Generous amounts of penetrating oil, combined with a little common sense, has always allowed me to remove these without destroying them. Loosen, but do not remove, the four hub-to-knuckle bolts from the back side of the hub/rotor. Leave about 1/8" gap between the bolt shoulder and the knuckle surface. Apply some tension with the hub puller, and strike the hub bolts with a hammer, each one in succession. This will almost always free up the hub from the knuckle. You can then remove the bolts, and remove the hub/rotor assembly with the puller alone.
-Tom