Well I just got back in from doing a valve adjustment on my 123 (couldn't wait any longer). While I was out I took a look at the 190D and here are my findings. After bleeding the brakes yesterday and getting the results that I did I checked the fluid level and it was still full. I checked all the brake lines and I couldn't find any leaks (which makes sense). I also checked the vacuum and it was showing 20". Not great, but not bad.

This car definitely does not have ABS. there is no "BOX" and no extra lines going to the master cylinder, but for some reason Fastlane has the master cylinder priced at $241. I called up Advance and got a price of $104. I'm going to do some checking with my MityVac to see if I can't find a leak some where. With cost to repair costs like these I need to find the problem and not replace and hope for the best.

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83 300D
84 190D