i assume they are all connected tot he same pump, but have different lines that are color coded to different systems.
But I'm not a tech, so I don't know for sure. But it is what I think.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.