Date registered: Apr 2012
Vehicle: 1984 300D, 1991 300CE, 06 E55(sold), 1990 350SDL(sold) 1996 S600C (sold) 2001 E55 (sold)
Location: Dubai, UAE
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The vaccum system in these cars is not complicated but it just takes time to track down the leaks. So here is a quick breakdown
240D , the vaccum system runs the locks, brakes , transmission, shutdown, cruise control.
300D, the vaccum system runs the locks, brakes, transmission, shutdown, climate control system (dash pods), cruise control.
Track down the leaks and fix them one by one, your brake booster could be leaking. Usually its the locks that cause trouble but if you have capped the line to the locks and it still takes awhile to shut down you have other lines leaking.