Hi all, my 06 3L GU wagon developed a problem when I tried to tow a heavy caravan. The rear brakes locked up. After going through the obvious check list it was decided that the proportioning valve was the problem. Couldn't find a new or used one in Australia and the new one from Nissan would have to be imported, so for shits and giggles I took it off and took it apart. The only thing that seems out of wack is a rubber seal - appears loose. Thanks for this thread, very informative.
Does anyone have a wagon wrecking atm and would sell me the unit?