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When the vacuum systems aren't working, what's your vacuum at the takeoff points on the booster check valve? If no vacuum there, you know you either have a serious leak in the brake booster, or the vacuum pump isn't working.
Buy a hand vacuum pump and start pulling vacuum on various circuits in the car until you find the one(s) that don't hold vacuum.
Your vacuum system to the injection pump stop should release vacuum when the key is turned. If it doesn't, you have a problem in the vacuum portion of the ignition switch, or the lines installed backwards at the ignition switch.
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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