Hey, i am new to the forum and am finding all of the information very useful. However, i do need help with one thing. My rear right tire or wheel is making this wierd squeeking/whistling sound, and the noise pulsates, it is not constant. It has only done this recently, any ideas as to what it could be. I recently bought the car so carmax will fix it for free, but i would like to know what is wrong.