Hi and welcome to Fixya. I am Kelly.
You have correctly identified the problem as the brush roll itself.
There is a bearing under each end cap of the brush roll. You can gain access to the bearings usually by gripping the browah roll end caps and rotate the caps in opposing but loosening (ccw rt / cw left) directions.
Many times I have found that there is just a mass of hair under the end cap that functions like a brake. Clean it up really well on under BOTH end caps.
Do a spin test by putting the end caps back on (Hold it horizontal) and rotating the brush roll with your thumbs. It should spin freely.
If it feels like there is still friction then your probably going to have to take the brush roll with you down to the nearest vacuum cleaner repair / supply shop and get 2 new bearings. Most shops will install the NEW bearings for you if you have the brush roll in hand. It is a much cheaper fix than the brush roll itself.
(buy a new belt too!)
Take care
Kelly
http://www.eureka.com/servlet/ListParts?model=5902avz
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