W220 Rear Brake pads
https://www.youtube.com/watch?v=jGBL3M0r_as
I did them in conjunction with all new rotors (Genuine MB) and pads (Akebono). I don't remember anything hard - and I think it had roll pins? Mine is a 2005, post-facelift, so it should be similar to yours, but it's been a couple of years, so I don't recall.
Perhaps you could post a quick picture?






