No that sounds right. To get the values at WOT, idle, and 10mm you disconnect the black line from the Y and test there. But to test for leaking you pull all the lines off the bleeder valve.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k