are you having trouble with doors locking ,hard brakes etc,maybe booster line is cracked or maybe booster is leaking off vacume,i just went through my vac system to track down leak,start with biggest suspects first then narrow down by system.it can be tedious but do a search here for vacume shuttoff there is a nice diagram there of the whole system.
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95 e320,87 sdl,79 300sd
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