Why does my Audi A2 make a strange noise when braking?

I have noticed that when I brake in my Audi A2, there is a weird grinding noise coming from the wheels. It doesn't seem to affect the braking performance, but I want to know what could be causing this.

It is likely that your brake pads are worn out and need to be replaced. This is a common issue in many cars and can cause a grinding noise when applying the brakes. I would recommend taking your car to a mechanic to have them checked and replaced if necessary.

Another possibility could be that your brake rotors are warped. This can also cause a grinding noise when braking and should be addressed by a professional mechanic. They may need to be resurfaced or replaced depending on the severity of the issue.

If your car has been sitting for a long period of time without being driven, it's possible that rust has formed on the brake rotors. This can also cause a grinding noise and should go away after a few days of regular driving and braking.