My brush bar keeps falling down. We replaced motor but now the brushes don't spin.

SOURCE: Brush assembly will not spin at all.

The turbine is bad, that is what drives the brush roll. You either replace it, sometimes you can take the turbine apart and clean it, alot of times they just get gummed up and won't work. Number 23 is the turbine.

SOURCE: brushes won't spin on hoover steam vac ls

I have the SteamVac Dual and there's a screen on the underside of the unit. It's beneath the brushes and it's red. You have to pull and wiggle it to get it out. With the machine unplugged, lay the unit with the handle on the floor. In the owner's manual ( http://www.hoover.com/pdfs/manuals/F7222900.pdf ) this is shown on page 10 figure 3-2. Clean that screen.
If they still won't spin, then take the brushes out. Again, with the unit on the floor, you simply grab the unit firmly and pull towards you. It's much easier to remove than the screen. I took the brush unit outside and blasted it with the house. You'll have to pull out whatever fur balls are clogging it but eventually you'll see that the brushes spin freely with the water squirting on them. Plug the brush unit back in and - in my case - they started spinning.

SOURCE: brush spin,good suction at hose, no suction at

Air passage from back of brush head, through the joint, and up to bag, may be blocked.

SOURCE: help for free???? my spin brushes won't spin

I have the 7443-940, and on this one, the brushes are powered by the water coming from the water pump. If there is no water in the unit, they will not spin. I do NOT know if yours is the same way, but it's worth trying it out.

SOURCE: Brush won't spin on my Hoover Mach 5

I love this vacuum but had the same problem.

SOLUTION:
take the roller off and flip the thin belt inside out. This fixed my vac and works great again.