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You mean the little piston with the 2 seals on it? This is your control valve, one side of the piston see's air pressure and the other side see's hydraulic pressure (brake fluid). I am unsure which side is which off the top of my head. Call Brake Systems Inc in Oregon and ask for Dale. Tell Dale...

Here is the 800 series TM for the AIR PAK. Basically gives you every step in rebuilding the darn thing with great pictures and instruction's. Works the same for the GMC kit aside from a last step or two but it's all pretty self explanitory. Scroll down to page 12-12 or do a search on the PDF...

I just used a set of needle nose pliers for the snap ring that holds the check valve in place. Came right out but I forgot about the spring underneath and it all went flying into my face. Luckily missed my eye, but I'll use your method next time. I used a fine thread tight fitting metric screw...

Lets give a huge, huge thanks to Jollyroger and Oldfart. **** fine tutorial and very self explanitory. They are actually pretty simple in design and I had no troubles taking mine apart. Mine had over 1q of fluid inside it, every darn seal inside was melted or crumbled and clogging up many of the...