Yep, bigger hammer. (If equipped, make sure you removed the allen head that mounts the rotor to the hub). The rubber mallet is taking the blow vs. the disc. You can (if you want) use a punch and push the pins through - but usually isn't necessary. When hammering I like to hit the edge of the rotor hard to help break and rust then I go around the perimeter on the face of the rotor...I then hit once or twice from the inward facing face and it comes loose. Usually it doesn't take that much.

__________________
1988 Mercedes-Benz 300E 5 Speed ~200k
1958 Mercedes-Benz 190SL (sold)
2000 Mercedes-Benz ML55 AMG ~230k - FOR SALE
2003 Audi A4 1.8T Quattro - Wife's Car
2007 GL450