Sometimes at a stoplight or when I first start up my car in the morning I hear metal vibrating noise from somewhere in the front. It happens when I push the brakes. It seems to be intermittent, but I hear it very often. My car is all stock.

 

define metal vibrating noise. can you describe it a little better?

 

This could be your EGR transformulation valve acting up. Remove it and clean it ASAP.

 

I am sorry but what is EGR transformulation valve and how do I remove it?

 

When your car is on a lift, you can see it easily. The only way to remove it is from below. It is mounted on the block underneath the rear exhaust manifold, which must be removed to access it. Once that is off, you'll see it. Get a mechanic to help.

 

Ok then wouldn't the noise be coming from the back? I don't think that's my problem

 

Rear manifold, that's on the engine. Not rear of the exhaust system.

 

I'm not sure if mine are doing the same thing your are but they might be. When the car is first started and the brakes are cold and I apply the brakes going slowly they make this horrible moaning, grabbing sound. It happens when I back out of my driveway and at the end of the first few stops I make. Like I am going 30 and hit the brakes and I slow down until I am just about stopped and then it makes the noise. Also when I let off the brakes a get a very short blip of it. Is the the same thing that is happening to you?

 

Ok, I just went outside and tested for noise again. I started the car, pushed and released the breaks, and there it goes again. It sounds like two pieced of metal touching each other at a high frequency, but I might be wrong. It lasts only for a few seconds after I release the breaks and seem to disappear after I did about 5 times. Hope this helps to identify the problem. Thanks!