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Yes, and having done it now, I discovered it is easier to simply bypass them than to remove and cap the inlet lines at the 2way checks. here is something that shows how easy it is… i also removed the check valve and fitting and all that associated tubing down in the bumper and put a quick...

Cool, looks like it belongs there...

The advice given was not to cap the service and emergency lines, it was to de-install them COMPLETELY and cap the ports where they were connected to their respective checkvalves... These are supply lines. They both take air from the vehicle ahead and feed it to the input of two separate check...

Both front service and emergency lines come in and feed 2 check valves respectively(thru “T”s). Only reason to vent the emergency at the gladhand is in the event one of the check valves fail(the one where it feeds air in between dryer and wet tank) and backfeed the other 2 way check valve...