How to troubleshoot a malfunctioning brake system in an Audi A3?

I've been noticing some issues with the brakes in my Audi A3. What should I do to diagnose and fix the problem?

First, check the brake fluid level and top off if necessary. Then, inspect the brake pads for wear and replace if needed.

It could also be an issue with the brake lines or the master cylinder. I recommend taking it to a mechanic for a thorough inspection.

Are you experiencing any strange noises or vibrations when applying the brakes? It could be a sign of worn rotors, which will need to be replaced.