Was the suction device hand operated or a venturi type of device that would provide continuous suction? A venturi suction may have helped with the problem with air getting past the threads.
Any other members with experence with suction type devices?
If there are proplems with suction perhaps I will restrict the travel of the master c piston and flush the old way.
96 C280 Mercedes
82 Rolls Royce Silver Spur