Funny you mention it, as I have been meaning to ask on the forum about exactly the same problem with my b4 audi 80. Sometimes it is the fronts, sometimes the rears. All the brakes are operating correctly, but at certain speeds I get this 'twittering' noise - it's like a vibration or light contact squeal rather than a binding brake. Just as you describe, if I touch the brakes it is gone, and the noise usually only develops at certain speeds after driving for a while. I tried fitting some anti squeal adhesive pads to the back of the brake pads which has helped, but still get a faint noise.
Sorry I can't help, but at least you are not alone with it!
|