One of the problems with DOT 5 is the way is absorbs into the seals.  I
learned this on my Yamaha RD400.  Evidently, the 3 & 4 soak into the seals
and naturally swell them.  Dot 5 does not.  The 3 & 4 systems are designed
for this and when the 5 soaks into the seals, they shrink and you loose the
system. DOT 5 is only for systems that are designed for it.  Lost the front
brakes on the bike after about two weeks.  They came back with nothing more
than a flush and refill with 4.

Mark
----- Original Message -----
From: "Christensen" <populuxe@QWICS.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, July 19, 2003 12:06 PM
Subject: YIKES! was clutch not working

I think have read DO NOT USE dot-5 brake fluid for vanagon.
causes corrosion.