'90 Sub, had the entire front end gone through summer 2009. Everything was checked, adjusted, pads replaced, rotors turned, etc. For the last few months, there has been a constant metallic squeak from the right front while in motion, and the noise disappears when brake pressure is applied. I finally decided to pull the wheel off, and began looking around. Before the full service mentioned above, I had a similar sound from the same corner, which turned out to be two broken caliper bolts. So I checked those first. Then I looked at the pads....the outer is nearly void of any friction material and the inner is in perfect shape. Throw me some ideas as to what may be the problem.