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?

 

This may help.

In my car when my rear brakes were going bad, the brakes automatically make a weird sound to let me know that they are going bad. They said it was normal, I had to get new brake pads, at first I thought my master cylendar was bad but it was fine.

I would suggest getting them checked out by a local Midas or some reputable shop, better safe than sorry. And if you do in fact need work, they wont charge you for the "checking it out", if you pay them to do the work for you.

 

but my brake pad are new

 

Well if you installed them yourself there could be a problem... who knows. Just take it to a shop and be sure.

 

rear caliper sticking?

 

does caliper sticking will damage the rotor?

 

it can... maybe it's just angled funny or a bolt may be loose and something is shifting...