Bissell PROlite Replacement Belts (Style 6), 2 pk, 32053 Includes 2 belts For use with BISSELL Vacuums Works with Model #s: 3560 series, 3561 series When do I replace the belt? If the vacuum is not cleaning as well as it had before or the brush roll has stopped turning, you may have to change the belt. To change the belt, please refer to your models user guide for installation instructions.