Get under the van and have someone push in the clutch pedal, the clutch
lever on the side of the bell housing that the clutch slave rod connects to
should move some 10 to 15mm (about 1/2 inch).
This is measured  at the end of the lever where the slave attaches.
If it is not check that you have bled the system properly. You do not need a
bleeder for this, you can do it the old fashioned manual way, have someone
operate the pedal while you are under the van with your tube and jar.
Bleed until there is only clear fluid (no air bubbles) going thru the tube.
It may take a while, mine did, I vigourously pumped the pedal 20 odd times
with the slave bleeder open when I replaced the slave and master cylinders
before I bled as per normal. (if you work out the volume of the cylinders
and the line you can see why there is so much air to bleed).
If all is well you have other prolems!!
One reason to use pressure bleeders is if you are bleeding a system where
the master cylinder may not be new.(or for speed)
On an old master cylinder when the pedal is pushed down to the floor the
internal seals will be moving onto parts of the cylinder wall that it never
had before, and guess what, the wall on this part of the cylinder will
usually be  rusty with lots of crud, next thing you know the seals are
ruined.

John.
----- Original Message -----
From: "Jeffrey R" <Oxroad@AOL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, February 19, 2001 01:50
Subject: Re: Clutch problem on 85 westy

> In a message dated 2/18/2001 12:40:33 PM Pacific Standard Time,
> jbeckham@WORLDNET.ATT.NET writes:
>
> > Now for the problem I just
> >  finished installing the master cylinder and still have an intermittent
> >  clutch some times it works some times it don't.