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Were full air brakes a thing when these trucks were designed? Maybe the military guys didn't trust the technology and wanted to stick with powered hydraulics. The CCKW before it had vacuum-assisted hydraulic brakes.

I'm not familiar with how powered hydraulic brakes work. Do they rely on a hydraulic pump, like the power steering pump?

I was in contact with a guy who can 3D print metal automotive parts, including brake components. He actually specializes in antique car restoration. Perhaps if there's enough interest here we should engage him?

All the 5-tons from the M39 onward have power steering stock, but also had an air-assisted hydraulic brake system like the M44 deuces. It wasn't until the M939 5-tons that full air brakes came stock. That truck looks like an M51 5-ton dump with an air brakes mod. It makes me wonder if it...