Your cruise control on your 85 380SL is electronic. No vacuum needed. The actuator is controlled by a electronic module that lives under the driver's side kick panel. Upper left side under the panel. It's a big black box.
Generally, when cruise doesn't work it's this brain that goes bad. German electronics from the 80s are crap. However, it's easily remedied with a steady hand and soldering iron. You're also welcome to contact Kris at this website for his repair services. His forum moniker is James Dean. Awesome services.
Vacuum isn't driven by a pump but by the sucking nature of these engines on the intake. IE, engine needs air for the cycle and that sucking air is what makes the vacuum. Rowdie will no doubt correct my understanding of how this all works and I await his reply with anticipation
Generally, when cruise doesn't work it's this brain that goes bad. German electronics from the 80s are crap. However, it's easily remedied with a steady hand and soldering iron. You're also welcome to contact Kris at this website for his repair services. His forum moniker is James Dean. Awesome services.
Vacuum isn't driven by a pump but by the sucking nature of these engines on the intake. IE, engine needs air for the cycle and that sucking air is what makes the vacuum. Rowdie will no doubt correct my understanding of how this all works and I await his reply with anticipation
