I have read the posts regarding brake squeak here. I assume the squeak comes only when the brakes are pressed, right?

In my 2006 Vantage I have a high relatively high pitched squeak from my rear passenger wheel area, most pronounced when I slowly accelerate from a stop. It is irregular, but usually starts with a long ssqeeeeeaaaak then two or three smaller squeaks as the wheel turns. It happens mostly without the brake on, very little or gone when the brake is applied. We lightly feathered the leading edges of the brake pads, but it didnt go away. We were able to tight the wheel nut, however, an entire quarter turn....which surprised me. After that, the squeak got worse.
Wheel bearing? Do you have other ideas for the cause I can investigate? I have tried the hard braking with no effect.

 

This is a common issue and there have been several different explanations, none of which have turned out to be the cause in my case. Some have said it's the parking brake tensioner that needs to be adjusted.

I have had my car up on a lift and was able to turn the rear passenger side wheel without the squeal. With varying amounts of parking brake use the squeal didn't appear, so the conclusion is that is not the cause.

My understanding is that there is a very tight clearance between the brake disc and the metal shielding and that this tight tolerance leads to the sound. Some have said that by simply bending the metal back a bit by hand to increase the gap resolves the problem. I'm planning on trying this but haven't gotten to it yet...I think it will solve the problem.

 

i had the same issue on my db9 and it was an emergency brake pad that was wearing unevenly. under light acceleration and some cornering it would squeek a tad then go away. when the tech took it apart the outside e-brake pad was very worn while the inside one was barely worn at all. i don't know what fixed the issue as i took it in for service and went home with a new car instead.

 

+1 if you haven't tried that, I've heard the same thing.

 

We noticed there was tight clearance between what looked to be a heat shield and the inside of the rotor. Is that what you referred to Tahoe? It did not appear close enough, however, to be rubbing or to make the sound....
We took the park brake pads off and didn't notice anything funny about their wear

 

The bent aluminum shield problem happened to my car, it was the front right though.

Pulled over at 2AM, pushed hard against it, then the sound disappeared.