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Being in the "Present Conflict Vehicles" category and FMTV topic I was referring to modern air brake equipped vehicles/trailers ,both military and not, not older air/hydraulic or other vehicles/trailers. To the best of my knowledge the modern semi trailers, Ammo trailers, LMTV and FMTV trailers...

The trailer service brake control lever ("johnny bar" in trucker lingo) has many uses. Most all of the examples given so far are true. The lever is used to control the service brakes not the emergency brake (also referred to as parking or spring brake system) on the trailer. It can input...