You should check your Carpet Pro vacuum cleaner's rotating floor brush and drive belt regularly for wear or damage. Replace the belt if it is broken or worn. The drive belt is a critical component of your vacuum that allows the brush roll to spin and help remove dirt and debris from your carpets. If your Carpet Pro vacuum is not cleaning as well as it had before or the brush roll has stopped turning, you may have to change the belt. If you notice a rubber smell coming from your vacuum you should check your belt for any signs of wear. To change the belt on your Carpet Pro vacuum cleaner, please refer to your user guide for installation instructions.