Does anyone know what would cause the A/C low side pipe to vibrate excessively and create a horrible vibration sound? This only happens when I come to a stop and hold the brake for at least 30 seconds. It could be something else, but I think I've narrowed it down to this low side pipe on the driver's side.

Below is a link to a audio clip of this problem. You'll hear the first vibration sound at 13 seconds, then the second worse sound at 42 seconds. Please listen to this clip and let me know if anyone has any idea why this could be happening. Thanks

Audio Clip:
http://athenshome.tumblr.com/post/61...pipe-vibration