Normal brake fluid is glycol based. Dot 4 is a higher performance standard
and is VW recommended. Dot is silicone based is not compatible with DOT 3
or 4.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
AAG - Larry Word
Sent: Monday, December 03, 2007 11:03 AM
To: vanagon@GERRY.VANAGON.COM; vanagon@GERRY.VANAGON.COM
Subject: 85 Vanagon - DOT brake fluid, DOT 3 vs. 4

Ok...it appears "most" brake fluid now is synthetic, agreed?

If so, and I have the old DOT 3 in my system, must I flush all that fluid
out to get consistant synthetic-only fluid?

Any can anyone tell me of a case where synthetic DOT 3 was NOT adequate
for the job of stopping our small vans....

Larry
Ga.

PS. I'd like to stay with what I've already got in the system, synthetic
DOT 3 and I have a hard time believing my little daily driver van needs a
HP, hi-temp. brake fluid so tell me how I'm wrong?  Any case studies where
DOT 3 was not adequate....