Is it a drum or a disc?

If it's a drum, you need at least a 4lb sledge hammer (a rubber hammer won't loosen anything - especially anything wheel related), and you need to smack the bejeezus out of the drum squarely between the lug bolts. Use the lugnut tightening sequence, and keep hammering it until it comes off. I've had drums take half an hour & two techs to get off before - it just takes persitence.

Oh, and you are striking the outside-facing portion, correct? Never hit a drum on the edge or "from the car outwards".

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.