Just held on by a single hex head screw. I find a rubber mallet usually works pretty good if they are rusted on. After you get them off, clean the area up with a wire brush and apply a little anti-sieze so you don't have the same problem again next time you need to change the rotors.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record