I posed this question in another thread.. thought I might stand a better chance of getting an answer in a dedicated one.

How quickly should the vacuum pump in a 300D get up to vacuum? If I block everything off and check the vaccum on the main line. It will get up to 25bars. However, it takes a good 30 seconds or so to reach that level. Is it normal for it to take that long?

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.

If there are no leaks between your vacuum gague and the pump that sounds way too long. My '85 will max out in less than 10 seconds at idle. It may be time to put in a new diaphram. Vacuum pumps on 617 engines can be rebuilt but I wouldn't try it on a 603.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold