Just answered my own question. Found the Hydro-Max™ Hydraulic Brake Booster and Master Cylinder online. As I assumed, the access to the rod to reset the differential pressure switch is located on the passenger side of the master cylinder. It looks like a 1/2" or larger brass bolt. It is called a "spool plug". Here is what I found online. It may not be specific to the W24, but it shows the cross section of the master cylinder and other parts...
Paul
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