That has been a hot topic with several different threads over the last week or two. You should try a search with "tran*" as the subject, you mioght find an answer there.
Also check transmission fourth gear? and
No kick down on 240d auto trany

Yes it should kickdown but I am not sure if yours works off vacuum, my w115 240 doesn't.

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Ncnetman
1978 300cd fresh paint
1965 Mustang
1968 Torino GT fastback
2015 VW Passat TDI
1969 Ranchero- project
1974 240d 4-speed -for sale
1976 240d - for sale
1990 6.2 Suburban 194k-getting a 6.5 turbo
2008 Duramax Silverado-totaled
1959 Chev 3100 Fleetside - sold