K11 (cvt) Carbon Brushes & Clean MAF

hi everyone - I'm trying to remove/inspect the carbon brushes on my 1.0L CVT K11 Micra and also to clean out the MAF/butterfly thingy......does anyone have a step by step guide or photos I can use? I'm a bit of a novice but want to get my hands dirty and have a go. thanks guys
its not hard to get to the brushes, they are located on the side of the gearbox facing the front, you will be able to see them if you look. you might need to take out the battery tray but i dont think so.
just unplug the wires going to it and then unbolt the brush holder, then it just pulls out.
as for cleaning the maf, why?