If this is a 560SL it's attaches at the back of the engine at the passengers side right under the Bowden Cable bracket IIRC. Yes, I wrote that post about adjusting the modulator assuming vacuum is properly functioning nor nothing is disconnected.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k