What are common causes of brake failure in Audi 80 vehicles?

I have noticed that my 1995 Audi 80 has been experiencing issues with the brakes, such as reduced braking power and a spongy pedal. I would like to know the possible causes of this problem.

One possible cause of brake failure in Audi 80 cars is air in the brake lines. This can be caused by a leak or improper bleeding of the brakes. It is important to bleed the brakes properly and check for any leaks to prevent this issue.

Another common cause of brake failure in Audi 80 vehicles is worn or damaged brake pads. Over time, the brake pads can become thin and lose their effectiveness. It is important to regularly inspect and replace worn brake pads to ensure proper braking performance.