Is there any way to repair the master valve if it is leaking? I can hear it buzzing like a kazoo after I shut down. Enough to lock it immediately after shutdown but when I return to unlock the car the actuators fail to move.

Or, if not, how available are the valves and at what cost

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Vehicles:
2002 SLK 230
Gone but not forgotten:
1983 300D
1981 El Camino 'OILBRNR' - 6.2L diesel
OM617 powered '86 F150
1984 BMW 524td
2001 VW Beetle TDI
1994 Sunurban 4x4 6.5L diesel

They are available. I don't think you can rebuild them. Click on Buy Parts above.

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1981 300TD "The Green Lantern"
1980 300TD
1983 300D Euro "China Cat"

Are you sure the valve itself is leaking and not the lines/connectors?

My door locks quit working the last time I locked my 300TD. I'm guessing that's going to be a vacuum issue. Is that the first thing one would look for?

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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century

OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles