The brush is controlled by the powerbrush switch on the upper handle. If the brush is not rotating with the switch in the on position, unplug the machine from the outlet and remove the access plate from the bottom of the machine and check the brush and belt for damage. Clean the brush roller of debris. If the brush will not turn by hand, or the belt is broken, these parts should be replaced. If you continue to experience a problem, please take your machine for inspection to a local BISSELL Authorized Service Center or call Consumer Services for assistance at 1-800-237-7691, Monday - Friday 8 a.m. to 10 p.m., or Saturday 9 a.m. to 8 p.m., ET. To locate your nearest BISSELL Authorized Service Center, go here http://www.bissell.com/support/product-support/service-centers. Enter your zip code to perform your search. You can also locate a Service Center by phone, 24 hours a day, by calling 1-800-237-7691 and choosing option #1.