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Hm. They ain't all that and a bag of chips. Mainly, I was curious about them as a better parking brake and *maybe* an e-brake in case of service brake system failure.

Say, that's very interesting! How is it actuated? Parking brake handle or something else? I'm guessing it's hydraulic and not cable actuated?

I definitely did not hear this from an official source, just some guy who claimed to be in the military and drove them. It does seem doubtful.

Interesting stuff! I also recently heard that some 809's were upgraded to Allison automatic transmissions. I wonder if these early trucks that were rebuilt, were equipped with autos, alongside the 939's that were being built? My first impressions were that the 809 series was very homogenous in...

I saw a thread on that somewhere. For sure, that's the ultimate upgrade but it seemed awfully expensive.

They are indeed, single circuit brakes. There is a fair amount of discussion in the Deuce sub-forum about upgrading them to the Air Force dual-circuit master cylinder. If they are successful, I'm hoping the procedure can be adapted to the older 5 tons. One guy just completed the upgrade but is...