What Mr Benhami Yengari is very true.This has happened to my daughter’s DC 40 upright.I have stripped it down to the belt and seen the bearing sized with hair.I had to buy the whole new brushbar ($95),This unit has issues and Dyson should be able to supply all different parts that go into brushbar unit—screws,brushes,belt,bearings, motor and center drive wheel ... I also agree with these two comments. I took apart the Brush bar and yes indeed the hair trapped in it from my Daughters hair burned off the plastic bearing housing as well. Seems like this is a very common problem around the multi floor 2 since all second hand listings claim the brush in the Cleaner head doesn’t work.