Sinking brake pedal without fluid loss is bad check valves or ports in the
master cylinder.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Helmut Blong
Sent: Thursday, September 14, 2006 9:33 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Vacuum pump

Thanks very much. Since your clever like that, what do you think is the most
common cause for a sinking brake pedal? I figure vacuum as I am not losing
brake fluid anywhere. It's a long run from engine to brake servo and I'd
love to be able to narrow it down to common fault locations in that vacuum
line.

cheers,

mordo

---------- Forwarded message ----------
From: Doug <vanagons@cox.net>
Date: Sep 14, 2006 9:27 PM
Subject: Re: Vacuum pump
To: Helmut Blong <helmut.blong@gmail.com>

Helmut,
Yes, pump is for CC only, just follow the hose over to either the
accumulator or actuator.
Yes, vacuum from engine is ported through a one-way valve directly to
the power brake servo.
Good hunting,
Doug in CT

Helmut Blong wrote:
> So, my search of Bentley and the archives seems to bear out that the
> vacuum
> pump is exclusively for the cruise control on my 90 Carat but I would
> like
> it if someone on list would confirm this.
>
> Ken Wilford's excellent posts on CC repair will be helpful when I finally
> tackle that beast.
>
> Power brake servo uses engine vacuum exclusively?
>
> cheers,
>
> mordo
>