Middle Brush the middle brush just falls out. Doesn't appear to be broken but it still just comes out very easy.

First, there is no impeller that turns the brush. It is controlled by a turbine assembly. There is the brush with the middle stem (know as the brush block) and the turbine turns the brushes.
Turbines cost $39.00
Brush Block Assembly cost $34.00
Called our store on Monday to order. 937 291 3560
www.daycinvac.com

You need to replace the brush block assembly

Hi! If you've replaced the turbine & gear assembly and the brushes are still not spinning, a replacement brush-block assembly may be needed. The brushes counter rotate and need each other to spin. If a single brush is falling out, the brush assembly is broken. If the whole brush assembly keeps falling out, the drive pin shaft may be damaged. To order a replacement brush-block follow the link below.

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Hope this helps!

see this causes and fix it. God bless you
If the vacuum cleaner brush is not spinning, the brushroll bearing might be jammed. Try removing the brushroll assembly and cleaning all hair, string, lint, etc. from the brushroll bearing. If that doesn't solve the problem the brushroll may need to be replaced.
If the vacuum cleaner brush is not spinning, the brushroll assembly itself might be jammed. Try removing the brushroll assembly and cleaning all hair, string, lint, etc. from the brushroll bearings. If that doesn't solve the problem the brushroll may need to be replaced.
If the vacuum cleaner brush is not spinning, the brushroll itself might be jammed. Try removing the brushroll and cleaning all hair, string, lint, etc. from the brushroll bearings. If that doesn't solve the problem the brushroll may need to be replaced.
If the vacuum cleaner brush is not spinning the cogged belt might be broken, stretched out too much, or might have fallen off. Check the belt and replace as needed.
If the vacuum cleaner brush is not spinning the drive belt might be broken, stretched out too much, or might have fallen off. Check the belt and replace as needed.
If the vacuum cleaner brush is not spinning the belt might be broken, stretched out too much, or might have fallen off. Check the belt and replace as needed.

Yes you can order a brush block. It comes complete it is around $35. You can buy or order them at any vac shop or call me at my shop and I can ship them out.
Josh 614.868.0799 m-f 9:30-6 sat 10-2

Check the bottom of your brushes. It should have a long shaft sticking out of of the middle of it which locks on the base. If you don't see the shaft, the brushes are broken

please clarify what you mean?
Do you mean motor bearings or brush roll bearings?
brush roll bearings can be adjusted to lower the brush closer to the carpet when worn.
to do this remove the front brush assembly, there is usually a sticker below the belt hole showing RED = POSITION 1 HIGHEST (ie a new brush roll)
GREEN = POSITION 2 MIDDLE (brush part worn)
BLACK = POSITION 3 LOWEST (brush fully worn)
At each side of this there are 2 clips unlock these and remove the bottom cover.
Release the belt tension by rotating the belt release at the front.
Before removing the brush roll, at each end of the brush roll there is a grey plastic bearing carrier (Square at the ends) MARK this with a pen or marker just so you know the original position, also look closely for the coloured markings as indicated above or numbering 1,2 or 3.
If RED or "1" is showing you need to remove the brush roll by pulling it out and rotate the endcaps to Green or "2" and re-insert the brush roll, If Green or "2" is showing then rotate the endcaps to Black or "3" and re-insert.
If Black or "3" is showing then the brush roll is worn and cannot be adjusted any more, fit a new brush roll and insert with RED or "1" showing.
To re-attach the belt, move the belt to the middle of the roll and rotate the belt knob at the front ensuring the belt engages with the hook on the inside.

Did you pull the brush block out to see the the shaft hasn't broken off of the brush block? If so, then replace the brush block. From the bottom, take the screws, 2 of which will be longer ones, these hold down the turbine . Turn it over and the top cover should come off. There 2 posts at the back of the cover, they just fir tight but will come out. The turbine #23,is in the middle, near the front, remove the 2 screws on the front edge of it, unhook the tubing, it will come off. So you can take it apart and clean it out, or go ahead and replace it.

If this is new, get it replaced under warranty. Take your model number, serial number, proof of purchase and the brush block with you, or you may be able to do it at hoover.com.