If the brushes on you Dyson hoover stop working, you've probably worn out a pair of contacts. Initially test the brush head. I used 16V as it was to hand. It takes ~1A. Polarity nmot important.
Follow this video https://youtu.be/UafhshE0Th8?t=120 and remove the clear dust collector (use the open button to first open the door, then press some more and wiggle and the container comes away, rotated around the front nozzle.
You can see the 2 contacts on the right. Clean and blob some solder.
If you pull the cover on the other side, you can test for a connection - about 5R, on the red and white twisted wires. There are also 2 hidden filters, so clean those under the tap, dry, replace.
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