<VV> SynPower Brake Fluid

[Ron F Hinz]

That's a bucket of BS!  My UV has had Dot 5 in it for the last 16 years or
more and the brakes haven't been touched since.  Same for a '50 Nash I have.
Use Dot 5 and they last forever.  That's why I just changed to it in a
Lakewood I'm working on.  You do have to remove the Dot 3 first, of course.
RonH

----- Original Message ----- 
From: "Mark Chapman" <chapmanmd@charter.net>
To: <virtualvairs@corvair.org>
Sent: Thursday, September 16, 2004 3:53 PM
Subject: RE: <VV> SynPower Brake Fluid


> ---snip--
>      Does anyone have any reason to think that SynPower is not
> hygroscopic?
> If it IS hygroscopic, you have to change it every couple of years around
> here. You never have to change DOT 5.
> --Unsnip--
>
> SynPower IS hygroscopic. It will pick up moisture, but does have a dry
> boiling point of 502 degrees F. Wet (saturated) boiling point for the
> SynPower is 343 degrees F.
>
> Im sure I'll get flamed for this, but I wouldn't run Silicone based
> brake fluid for all the money in the world... well, maybe for all the
> money, because I would need it to keep replacing every seal in the brake
> system that the silicone based fluid (DOT 5.0) ate up. Polyalkylene
> Glycol Ether based fluids (non-silicone) will not eat seals.
>
> Im also sure that you know that the only difference in Dot 3,4, and 5.1
> is wet vs dry boiling temperature of the fluid. Yeah, you do need to
> change hygroscopic fluid more often, but good fluid like ATE Super Blue,
> or Wilwood's fluid, or Motul 600 will last years under normal (non race)
> conditions.
>
> A friend of mine dumped some DOT 5 into a Porsche 356 and ended up with
> puddles of brake fluid and the need to replace most seals in the brake
> system in a matter of months. Castrol LMA (Low Moisture Activity) is ok
> and comes in plastic containers and maintains a long shelf life
> (unopened).  As a point of reference, experts (from ATE) estimate that
> brake fluid picks up in the neighborhood of 3.5% moisture per year.
>
> Yeah, I'm an engineer.  FWIW:  My conclusion:  ATE Type 200 and Super
> Blue are not only the cheapest of the performance brake fluids, they are
> also the cheapest per degree of boil protection, and have a very high
> 6-month BP (Boiling Point wet)estimate. In addition you can alternate
> with each change and the color difference will tell you when you're
> done.   [Note that ATE Blue is not DOT-approved because of the color.]
>
> If you can avoid DOT 5 fluid, except in cars that were made for silicone
> based fluids, I would.
>
> Just my humble opinion of course...
>
> Mark Chapman
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