Further point of clarity. I was originally distinguishing between two cars a 300D and a 500SEL. The distiction is between chassis type not diesel or gas. In other words all 123 bodies use dual vacuum systems "lock" and "unlock". The 126 and newer chassis use a single line pump based system of vacuum and pressure.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician