Hi,
the video gives you a step by step tutorial how to replace the rear brakes of your BMW 1, demonstrated at an 116i. Both the pads and the disks (rotors) are replaced. The new disks request a new adjustment of the parking brake, the video explains this in detail, too:
http://www.youtube.com/watch?v=OZD6mprPC1w
The video has a German soundtrack, but English subtitles are available at YouTube. If you don't see them by default, watch the video directly at YouTube and press the subtitle button below the frame.
Enjoy it,
Jürgen