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Here you see the vent line running up to the MC from the Airpack. The line is disconnected, you see the connector hanging free on the right.

Mine definitely went to the air pack The air pack just after removing it from the truck. The image on right shows a close-up of the air regulator section. On top you see a connector that splits into a large pipe going to the front of the truck and a smaller connection sticking upwards. That...

You capped the connection at the airpack side as well?

M39 - M51A2. I am overhauling the hydraulic air-assisted brake system. The filler cap of the MC has a vent line connection going into the airpack where it joins another line going in. THat vent line irritates me when trying to bleed and fill the system or controlling the system. Can I just cap...