Ok in the morning when i was driving, when ever i brake, there is a sound some what low-medium pitch sound coming from the back. It doesnt do it everytime i brake, only it is at the morning or i park my car long time. after i drive a while the sound is gone. I was wondering if anybody could help me find out what the problem is. Thanks! and i recently do the aem big brake kit convertion with new aem brake pads. do you guys think the sound is somehow about the aem brake pad or rotors?