okay i posted this in the brake suspension area, but not enough responses, so, i noticed at low speeds their is a groan coming from the rear of my car and when i brake the groan gets louder. while driving at low speeds i can kinda hear the groan almost as if the wheel is rubbing against something. has anyone ever heard this before. i have an 04 6mt with brembos, and i think its the rear brakes or rotors but that doesn't explain why the groan is there when im not braking

 

does anyone know anything anymore common i thought this was my source for all info. i made an appointment with the stealership and they claim i have to replace my brakes and rotors in the rear i just wanna know that im not getting f'ed in my rear again