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[ I did not remove the metal parts on the bottom of the original master cylinder cap when I did the job. Others have said you need to do that but my experience so far it made no difference. I think that fitting is a check valve. It may not let fluid into the master cylinder only lets air out...

That should be a vent line. If it had a resivour it would be mounted in the cab behind the drivers seat. It’s a common failure for these trucks to loose peddle , leaks in the air pac , wheel cylinders , failed break lines. Most common is the wheel cylinder followed by the air pac. Should be dot...