if you did not clean off the rotor of the oil they put on it that is why you have this sound, if not check your caliper slides and make sure it is not frozen, and make sure you do not have a twisted brake line. if it is more of a grinding noise and kinda sounds gritty (even when not braking) i would check your wheel bearings
Warped rotors. They need to be removed, turned or replaced.
Normally this is caused by a warped rotor. Have your brakes inspected and rotors turned or replaced.
form_title=Rotors Replaced form_header=Improve your brake performance with replacement rotors. We will help find you an expert auto technician to install new rotors. What is the year, make and model of your vehicle?=_ Have you noticed any unusual shaking lately when you press on the brakes?= () Yes () No () Not Sure How long has it been since you had your brakes replaced?=_ Have your brakes been squealing or making any noises? = () Yes () No () Not Sure
Frozen brake caliper
your brakes are probably sticking and either they need to be replaced or your rotors are bad if its not one of those two it could be somthing as simple as the caliber was put on the rotor crooked or the caliber is warped whicch is very rare so most likely you brake to hard and your rotors are wearing unevenly
warped rotors
It must be the rear brakes at fault.
Your brake rotors are warped and need replaced/resurfaced.
Disc brakes are supposed to rub the rotors all the time.
Check to see if the backing plate is rubbing against the rotor or the pads may have a hard spot in them
Rotors may be out of "round" (lateral runout) and need to be resurfaced or replaced
They need replaced when they wear out.