The back of the pads should not be lubricated!
grease is only for the moving parts
CRC disk brake quiet is what to apply on the back of the pads to quiet them
http://www.amazon.com/CRC-Disc-Brake-Quiet-05016/dp/B000CINV88
video:
https://www.youtube.com/watch?v=CZrZMxWHzCE
Also, check to make sure that the pads are not glazed (shiny)
you can roughen them up with a little sandpaper
grease is only for the moving parts
CRC disk brake quiet is what to apply on the back of the pads to quiet them
http://www.amazon.com/CRC-Disc-Brake-Quiet-05016/dp/B000CINV88
video:
https://www.youtube.com/watch?v=CZrZMxWHzCE
Also, check to make sure that the pads are not glazed (shiny)
you can roughen them up with a little sandpaper