How do I check the brake pads on my Audi A5?

I'm thinking of purchasing a used Audi A5 and want to make sure the brake pads aren't worn out. Can anyone walk me through the steps to check them?

First, park the car on a flat surface and engage the parking brake. Then, remove the wheels to access the brakes. Look at the outside surface of the brake rotor; if it's smooth, the pads are good. If it's scored or grooved, it's time to replace them. You can also check the thickness of the pads; anything less than 3mm means they need to be replaced.

Another way to check the brake pads is to listen for a high-pitched squealing noise when applying the brakes. This could indicate that the pads are worn and need to be replaced soon. Also, check for any vibrations or pulsations while braking, as this could be a sign of worn or uneven brake pads.