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Just for people trying to find information, MyothersanM1 did a complete retrofit of an M809 series (M818 tractor) truck from air-assisted hydraulic to full air brakes. Perfectly described with lots of pics and description of parts. He did mention that his costs were around $ 6K, not counting...

Completely agree, ... but.. I would trust maybe a 30 year old system a lot better than generic Asian replacement stuff including lines. So you have to make sure that all is replaced or overhauled and all with high quality stuff. And that was before I read more here about sudden brake failure...

Thanks for the clear answer. It's what I thought but I was hoping against hope ... Seems the only way how to really solve this problem is to figure out which commercial dual MC can handle this, install a second air pack, maybe even a third air tank, and split the brake system. As to splitting...

Saw this old thread while looking for info. Might as well reply and add my question/suggestion. Biggest problem of ALL M39s and M809 (the old 5-tons) is that they are single circuit. One leak and no breaks. A lot of threads about that. Standing on any hill or going with any speed and you will...