There is also a vacuum tank under the left front fender, and the
typical failure there is that the rubber connector between the hard
line and the tank goes bad, leaving you with a big leak and no door
locks.
The valve in the door can go bad too, we had to replace my brother's
in the 76 300D W115 (same part).
You should also verify that the main vacuum line is good and you do
indeed have decent vacuum to operate things with...
Peter
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