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Bill,
Did you mean "DOT 5" fluid? DOT 4 is borate-ester/glycol based, and is compatible
with (but a higher flashpoint than) DOT 3 automotive brake fluid.
DOT 5.0 is silicon based; and DOT 5.1 is borate-ester/
glycol again, but more borate and less glycol for *boiling point* similar to DOT 5.0.
BTW, although DOT 5.0 won't harm paint, it will render any surface it touchs *unpaintable*.
Regards,
Dale
From: WRJJRS@aol.com
Date: 2005/08/25 Thu AM 01:21:58 EDT
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Flamible brake fluid
[quote snipped]
Ed, I have checked with several manufacturers who say their stuff is compatible with automotive fluids. I have no idea why we would put up with the flammable aircraft stuff. Besides DOT 4 silicone fluid which has the advantage of not harming paint, I have been using various synthetics in my race bikes for years which are good to better than 600°F! I have heard some older auto fluids are corrosive to aluminum but with the number of aluminum components on modern cars it MUST be less common. I have had all sorts of ALUMINUM BRAKE PARTS including master cylinders on my bikes and never seen ANY problem. The aircraft fluid is simply stupid when compared to modern auto fluids.
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