Thanks for the feedback. Again, there is nothing wrong with the interior
locks. They function normally and hold vacuum all day. Nothing has changed
in that regard.

On Feb 18, 2018 1:17 AM, "Peter Frederick via Mercedes" <
mercedes@okiebenz.com> wrote:

> You can test the servo with a MitiVac -- supply line is brown  and servo
> line is brown with a blue stripe I think.  It is on the W123 and W115
> anyway.
>
> Problems are:
>
> Bad servo (won't pull down with vac application, won't hold vac) -- to
> fix, replace servo.
>
> Bad line from the main vac line, or broken nipple or cracked connector.
> No vacuum to servo, but servo holds and shuts off the car if a MitiVac is
> applied.  Main line must be replaced to fix this, the connector with the
> fittings isn't replaceable.
>
> Bad keyswitch -- servo will be good, vac will be good at the main line,
> but never appears at the servo line.
>
> Broken lines -- this is the usual cause, all that hard plastic line gets
> brittle with age.  If you've done any work on the driver's side of the
> engine lately, almost certainly it's one of the lines.
>
> Peter
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