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Date: Fri, 17 Jun 2005 13:46:15 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Brake Fluid
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jesse farr wrote:

> It is supposed to not corrode aluminum wheel and master cylinders; so 
> I have been told. DOT5 will probably do anything it will do, better. 
> The only reason to run aviation anything in a non certificated 
> aircraft is just to be cool, I guess.
> jofarr, soddy tn
>
>     ----- Original Message ----- *From:* WRJJRS@aol.com
>     <mailto:WRJJRS@aol.com>
>
>     Brake fluid that's flammable!
>      I knew there was a so called aviation brake fluid, but couldn't
>     figure why anyone would use it though. Is there anyone on list
>     that has an idea of what the aircraft fluid is supposed to do better?
>      First let me say that there are modern fluids for racing that are
>     good to incredible temps and are non-corrosive to aluminum. Hell
>     most of the calipers used on race cars have been aluminum for
>     years. Water accumulation is the only possible question that I
>     could see and modern fluids have no problem there. Silicone based
>     fluids have the advantage of not harming paint, but have
>     compressibility issues at high temperatures. I am planning to run
>     a high temp racing fluid unless somebody can tell me why I "must"
>     run aviation fluid.
>

Whatever you use, verify that it is compatible with the brake seals.  
For instance the "General Wheel & Brake Information" document at:

http://matco.elixirlabs.com/catalog/index.php?file=catalog&uid=2192&prod_pcategory=77774&clist=0,77774&uid=2192

says:

"All o-rings in the brake and master cylinder assembly are buna nitrile 
and are not compatible with automotive glycol based brake fluid.  ONLY 
red aircraft fluid (Mil-H-5606) or other suitable petroleum-based or 
silicon-based fluid should be used."


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