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Yes, I have not researched the casting numbers but looks like a very common 70's-80's GM 1/2 ton pick up mst cyl with power brakes before they went to alum bores with plastic reservoirs.

I do not have first hand knowledge or tested HMMWV brakes yet but in another lifetime sold parts. The hydroboost is the mechanical assist in place of a vacum brake booster in gas powered engines to make the brake effort/pedal softer/easier. If the hydroboost was out, on the brake side you would...