What are the common brake issues with Audis and how can they be fixed?

I've noticed that my Audi's braking system doesn't feel as responsive as it used to. What are some potential causes and solutions to this issue?

One common issue with Audi brake systems is worn brake pads. They should be replaced every 30,000-50,000 miles. Another issue could be air in the brake lines, which should be bled out using specialized equipment. Finally, faulty brake calipers can also cause problems and may need to be replaced.