MB has used other locking systems in the past -- just ask any 600 Grand owner. If you think vac systems are a pain, try hydraulic!

MB has used vac locks for a VERY long time, just how long I dont' know, but early 60's anyway. They are usually less trouble than electric, and cannot stick and run the battery down. Just an engineering decision. I like them better than electric, that CLONK of the locks operating annoys me.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!