None of the door locks, or fuel door lock, or trunk lock functions on my 82 240D. The vacuum pump and resevoir do appear to operate. There is no vacuum to the valve in the drivers door. Tracing the main vacuum line from drivers door, thru the firewall, it goes to two plastic valves located on the cam cover, which are operated by a cam on the throttle linkage. What are these valves? I have vacuum up to the union near these valves, but none past. Is this some kind of shuttle that regulates vacuum by engine speed?