Dc27 noisy brush bar when carpet is enabled

[jamesey]

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Hi just bought a working Dc27 from car boot .found the brush bar to be snapped at one end .I bought another and fitted it and tested to be OK and working great .
I've now sold the dyson but now the lady says the brush bar is making a right noise again when carpet mode is on .
As long as the new brush bar hasn't snapped again what could this be or to check for .cheers

[MVacs]

I'd be looking at the clutch, it might be ratcheting. Check the white wheel isnt melted.

[RustySkull]

And check for stuff jammed in it.

[jamesey]

cheers , got it back and found the bearings in the brush head solid , the person i bought the brushbar off must have washed it in the sink , good job i had some new bearings , cheers

[RustySkull]

Job well done!

[GeorgeJ]

I found this to be an issue with my DC14 a week ago.  The bearings were originals (from 2009) and one of them was barely spinning.  I used some bearing cleaner and some grease and cleaned them up good but the one was still a bit sluggish.  For about 15 minutes after the cleaning the vacuum was MUCH quieter... then I suppose the grease made its way to the edges of the bearings and the noise came back. 
 
Oh well - bought some new bearings off Amazon and will swap them this weekend.

[Madrat]

I had that happen on a dc14 while I was using it, it started making a strange noise and within 2 seconds the brush bar seized solid