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or maybe when he stabbed the brakes the wedges stuck abit. All needs to be checked though.

Yea most likely all of our 939 series trucks need wedge service. That would include cleaning and regreasing with correct grease all parts that need it. It would be a lot of work without a wheel dolly but well spent time.

Good job now close the valve and get to work.

Blockage in the last line that goes to the intake Maybe.

VENTING SYSTEM OPERATION The air venting system vents air from brake system and powertrain and fuel vapors from fuel system into air intake stack where it is released into the atmosphere. The components of the air venting system are: A. SPRING BRAKE RELEASE CONTROL VALVE - This valve...

Looks like the alcohol bottel in pic three and if so nothing to do with fording. It would be used in cold weather to try and keep moisture out of the air system.