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From: Dale Rogers <dale.r@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Flamible brake fluid
Date: Thu, 25 Aug 2005 9:05:06 -0400
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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.
> 
>