Yes, moisture is the enemy here.
It is a sealed system, but it will work its way in.
I highly recommend ATE Super Blue and Gold.
Good stuff.

dylan

----- Original Message ----
From: Max Wellhouse <dimwittedmoose@CFU.NET>
To: vanagon@GERRY.VANAGON.COM
Sent: Saturday, June 21, 2008 11:20:13 AM
Subject: Re: Brake Fluid, Flushing

I sorta thought the reason to flush brake fluid every two years was
to keep the absorbed water from rusting out the calipers, brake
lines, and wheel cylinders.  Guess the boiling point is of concern as
well.  The neighbors' vehicles that I have flushed the lines on can't
believe how nasty the fluid is when I finish.  Doesn't pay well, but
the baked goods sure are tasty!!!

DM&FS

At 05:37 AM 6/21/2008, Mike S wrote:
>At 11:13 PM 6/20/2008, Neil2 wrote...
>>At one point did 'they' include brake fluid flushes in Preventative
>>Maintenance?
>
>VW has recommended 2 year brake fluid replacement for as long as I can
>remember.
>
>Here's a page from a Vanagon maintenance schedule, via westfalia.org:
>
>http://farm2.static.flickr.com/1009/599107673_9d06692048_o_d.jpg