How to fix squeaky brakes on an Audi A3?

The brakes on my Audi A3 are making a high-pitched squealing noise whenever I apply them. What could be causing this and how do I fix it?

This could be due to worn brake pads or a build-up of dust and debris on the brake discs. I recommend getting your brakes inspected and replacing the pads if necessary. Additionally, make sure to regularly clean your brake discs to prevent future squeaking.

Another possibility is that the brake calipers are sticking, causing the brakes to not fully release and resulting in the squealing noise. I suggest taking your car to a mechanic to have the calipers checked and possibly replaced.