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Didn't happen since they would have had to do an air switch for the sprag. As well as make room under the hood and add a totally different cooling system to add a heat exchanger. It would cost too much to redesign and adapt over a new order of trucks for 75k each and they are making their...

Some M809s were rebuilt up until the mid 1990s. Production of the 939s started in 1983. In member David Doyle's book it states that some M809s were produced right along side M939s briefly as production began but then ceased production of the m809s

That is why you twist the knob as you pull it to increase pressure slightly as you pull up... It will stop a truck... It will stop a wrecker going 25mph as it slows enough combined with downshifting to stop it. It does work so don't try to negate the fact that it will come apart... It will...

pulling the manual shut off in center dash will kill it dead in the water as it closes the fuel feed completely.

I have a 816 and a 813 truck that do not have brakes at all that I never have fixed. I mope them around the yard or around the local streets slowly using the emergency brake to stop but i never get over about 15mph.

emergency brake. tighten the knob as you pull it up.