Hi, Rudy -
DOT 3 and 4 are both polyethylene glycol based and so are compatible with
each other. DOT 4 has a higher wet and dry boiling point than DOT 3. Both
are hygroscopic (will absorb water from the atmosphere, which lowers their
boiling points). DOT 5 is silicone-based and is non-hygroscopic and
non-paint removing, and also is not compatible with DOT 3 or 4.
Steve Byers
HBJ8L/36666
BJ8 Registry
Havelock, NC USA
-----Original Message-----
From: owner-healeys@autox.team.net
[mailto:owner-healeys@autox.team.net]On Behalf Of caws52803@aol.com
Sent: Tuesday, May 30, 2006 11:46 AM
To: healeys@autox.team.net
Subject: Brake Fluid
In replacing the hydraulics in my Healey Bugeye, it was recommended that I
use Dot 4. I have used Dot 3 on my Big Healey. Can anyone enlighten me on
the difference and if one would damage the system?
Thanks,
Rudy
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