How to troubleshoot brake pedal issues in a 1995 Audi 80?

I recently noticed that my brake pedal in my 1995 Audi 80 feels spongy and doesn't respond as well as it used to. What could be causing this issue and how can I troubleshoot it?

First, check the brake fluid level in your Audi 80. Low levels of brake fluid can cause issues with the pedal response. If the fluid is low, top it off and see if that improves the pedal feel. Also, inspect the brake lines for any leaks or damage.

Another possible cause could be a faulty brake master cylinder. If this component is not functioning properly, it can affect the brake pedal feel. Consider having a mechanic inspect and possibly replace the master cylinder if necessary.