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Date registered: Oct 2002
Vehicle: 1967 250 SL, 1963 220Sb
Location: Los Angeles / Altadena
Mentioned: 3 Post(s)
Quoted: 102 Post(s)
Vacuum seat back latches
My 1971 250 C has the vacuum latches for the seat backs, a vacuum switches as part of the door-open light switch, and a vacuum release button on each side in the back seat for the rear passenger. On an unrelated note, my car does not have vacuum locks.
The 1975 280 C at the junk yard is the same except lacks the rear seat buttons on the side for the rear passengers. This car does have vacuum locks.
As best as I can tell there is no connection between vacuum locks and the vacuum seat back latches. I don't think that they are even powered by the same vacuum - if I understand things correctly the vacuum locks require a vacuum storage device while the vacuum seat latches are only functioning when the engine is running and there is vacuum without a storage device.
As best as I can guess, MB decided that the idea that the rear passenger needed a button to press in order to release the seat while the engine was running and the door was closed is a stupid idea.
Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...