I changed both front and back pads myself as Audi wanted the earth to change, I bought genuine Audi pads, make Sure you get the exact pads for your car (should be the same as mine), pay particulate attention to the letters at the end Of the part number, Ring Audi and get the 4K part number, you will need an OBD11 or similar when you do the rears (if you are doing yourself) as you will need to wind the callipers back (with the bonnet open)! Hope this helps….