Unusual brake noise or braking behaviors should be treated as a warning that one of the most essential systems on your car is malfunctioning. The brakes are exposed to tremendous forces and generate a lot of heat every time you stop your car. When you press on the brake, all the energy that your vehicle creates by moving down the road has to be converted to heat through friction.
A rattle noise from the brakes is a common issue for drivers. Most often brake rattle happens when you let up off the pedal. Suddenly you may hear a rattle. Usually it sounds like the rattle made when shaking a can of spray paint. Brake pads can rattle sometimes due to heat expansion, especially if they were installed without anti-rattle shims. Keep in mind that this rattle should not be consistent and it should never happen while you have your foot on the brake pedal.