While someone is pressing on the brake creating the sound, I would try the broom stick method. Wood is a very good sound conductor. Place one end on the different parts and the other on your ear. Often you can follow it back to its loudest point. Then you have your spot. With a clicking or tapping sound it works great. It should work the same with air.

Last edited by PatrickS; 04/07/08 04:22 PM.