My Hoover Max extract dual v cleaner worked fine cleaning the carpet but when it came to using the hose attachment for my sofa, there was no suction and the brush did not spin.

SOURCE: Problems with the Hoover Steam vac Heated carpet cleaner

This happens when the filter on the inside of the lid for the dirty water tank is pushed all of the way up. You need to leave a 1/4 in. gap from the top to the top of the filter.

SOURCE: Problems with the Hoover Steam vac Heated carpet cleaner

You'll have to go into the turbine assembly and check the bearings. Mine stopped spinning and this solved that problem. I simply began working the seized bearing until it rolled again, packed it in grease and reassembled.

SOURCE: Water leaking out bottom with hose attached

The water hose plugs into the solution valve-pressure on the side of the noozle(bottom). There may be a water line that has come loose there, you will have to take the top off to get to it.

SOURCE: The brush does not spin when making contact with carpeting

I tried the electrical-tape-around-the-wooden-spindle technique. After a minute or so, it's back to functioning normally.

SOURCE: i cant get the brushes

Remove the brush assembly and insert a flat screwdriver into the square hole and be sure it turns. If it is seized up, the turbine assembly will require replacement. If it turns, be sure the brush control is set to the brush position and the filter is clean. The filter may be on top behind a clear plastic cap, or underneath in red plastic holder depending on the model. The brush will also not turn unless the lower tank is in place, and the handle released and tilted back.