How to troubleshoot low brake fluid levels in Audi A6?

I noticed that my Audi A6's brake fluid level is low. How can I diagnose and fix this issue?

The most common cause of low brake fluid levels in an Audi A6 is a brake fluid leak. Check all of the brake lines and connections for any signs of leakage. Also, check for any damage to the brake master cylinder or brake calipers.

Sometimes, low brake fluid levels can be caused by normal wear and tear. Check the brake pads and rotors to see if they need to be replaced. It's also a good idea to bleed the brakes and refill the brake fluid to ensure proper levels.