Mandy,
First of all how many miles do you have on your current brake pads??
If you are going to replace them because they are making noise be sure to take a visual and see if they need to be replaced. The pads the Av comes with are very good and last a long time. They are made of ceramic material and go on for many miles.
From what we have been seeing the brakes in the back have been wearing out first before the front.
I currently have over 77,000 miles and both the front and back brakes still look good.
Good luck,