Got the front brakes done. Now I'm trying to do the rears but I hit a brick wall trying to remove the rotors. They just wont budge! I already removed the calipers and the allen screw... is there a trick to removing the rear rotors for my model year? I've been pounding on the rotors with a rubber mallet but they ain't budging, I don't want to brake anything.

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1995 E300 Diesel
2002 GMC Duramax CC LB 4X4