Two comments on different items in this thread as I have been away for awhile:

(1) Use Mercon III automatic transmission fluid (ATF) in the power steering, not, repeat not brake fluid. Brake fluid has deleterious effects on rubber seals. If someone put brake fluid into the PS system, immediately flush it and put in fresh ATF. Change the filter in the PS reservour at the same time.

(2) Flush the brake systen and install new brake fluid regularly. I do mine annually. Use any DOT 4 brand. The M-B brand is not essential. Castrol, Prestone, and Wagner make fine DOT 4 fluid. With the Ezebleed device, anyone can do this alone and easily on a Mercedes. I have done this for years on my 240D and ponton.

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Douglas
1959 M-B 220S cabriolet