yes and no, I believe it is 2 different systems.... however if you let the fluid from the master run dry then you probably have to do all 4 since this is the source of the fluid, and even maybe the clutch slave if needed (not sure on that one)?
 
If doing all 4 start at furthest should be drivers rear, then passenger rear, then passenger front then driver front. Always check your level in master to make sure you dont run dry. 

 

> Date: Tue, 7 Sep 2010 13:28:41 -0400
> From: ahurley@SHOPVIEWIT.COM
> Subject: Re: Riggins, Idaho - brake caliper?
> To: vanagon@GERRY.VANAGON.COM
> 
> It's been a few weeks - I had a local shop in Fall City replace the
> caliper as I thought it would be a simple thing, but it turned into an
> ordeal!
> 
> The brakes are still spongy - I asked them if they bled them and the
> said just the front as the rears are a different system, but I don't
> think that is true, is it?
> 
> Maybe I should bleed them all again. I haven't done it on this so I'm
> wondering what the system it, if any - like starting on the front left?
> 
> Thanks,
> 
> Andree
> 
> On
> Wed, 18 Aug 2010, greg@pottsfamily.ca wrote:
> 
> > Hi Andree,
> >
> > Calipers are available new for not a lot of $$$; If you're in a hurry then
> > I'd try NAPA or your local VW jobber, otherwise use one of the usual
> > online vendors. You might also want to check the repair shop listings at
> > roadhaus.com to see if there's a good shop nearby that could help.
> >
> > Happy Trails,
> >
> > Greg Potts
> > www.pottsfamily.ca
> > WWW.BUSESOFTHECORN.CA <--- NEW .CA DOMAIN!!!
> > 1987 Wolfsburg Weekender hardtop Vanagon
> > 1973 Westfakia "Bob the Tomato"
> >
> >> Hi,
> >>
> >> The 85 Vanagon seems to have blown a front drivers-side caliper. Wondering
> >> if anyone is near here that has a parts van? Or?
> >>
> >> Also have a serious heat problem, I am beginning to think vapor lock as it
> >> only happens on vacation in Idaho - never around western Washington. Found
> >> something online about 85 vanagon recalls for this issue as the van dies
> >> and then takes 20 minutes to restart.
> >>
> >> On WiFi at library/city hall!)
> >>
> >> Thanks,
> >>
> >> Andree
> >> 206-669-1622 (phone and text and direct email)
> >>
> >
> >
> >
> 
> Sincerely,
> 
> Andree Hurley