Some vacuums offer a feature that allows you to turn the brush roll on and off. The brush roll is disengaged by flipping a switch or through a foot pedal that stops the brush from rotating. The BISSELL Lift-Off is one unit that offers this feature. The Lift-Off utilizes a switch for turning the brush on and off. The brush should be on when doing normal carpet cleaning. However, when cleaning bare floors or delicate surfaces, you may want to turn the brush roll off.