I have some groaning (?) noise coming from the hydraulic unit of my evo5, and am suspecting that there is air in the system. I have downloaded a pdf document (from the yahoo groups site, I believe) that gives all sorts of trouble shooting and maintenance info for the AYC. My problem is in the bleeding section, step 1 is to connect a MUT-II diagnosis tool and activate the air bleeding mode. I'm in the US, so I doubt anyone here has this MUT-II thing, and if they did they'd still be confused what my car is and how it got here. So I'd prefer to do my own maintenance. Seems like I've read someone saying you can manually bleed the system, although it is a pain in the arse. Can anyone shed some light, on what you need to do to bleed the system without the MUT-II? Any help would be appreciated. Thanks.