I recently changed my brake pads and rotors about 1 month ago. This morning I could here a horrible sound almost like a rubbing coming from the LEFT rear brake. It doesn't sound like brakes squeling. It sounds more like a humming.
As soon as I press the brake, the sound goes away. The sound intensifies whenever I make a right turn or drive on the highway. Can anyone help me figure this out?

 

bump....need help

 

I know you stated that you replace your rear rotors, but did you replace them with new ones or used ones? I have that problem with my rear rotors and I was told that they are "glazed". I have new ones just havent put them on there yet.