This question doesnt particularly pertain to the A4, however I have gotten a lot of good feedback on previous issues from you guys. I have a 2003 A4 that Ive owned for about 4 months. When I got it there was no brake squeaking, however the front brake pads did need replaced. Once they were replaced everything was good. Then shortly after that the right front brake started to squeak a little bit. Now it is pretty loud and it does it everytime I brake, however only after I have driven a little bit. There appears to be a little rust at a spot on the brake drum where the pads could hit. Any ideas about what could be causing this?

 

https://www.audiforums.com/m_12749/tm.htm

This is a current post that is pretty much the same question. I think the suggestions here will help.