Mailing List flyrotary@lancaironline.net Message #26175
From: Ernest Christley <echristley@nc.rr.com>
Subject: Re: [FlyRotary] Re: Flamible brake fluid
Date: Thu, 25 Aug 2005 14:38:04 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
WRJJRS@aol.com wrote:

Bob,
 You are correct about the flashpoint comment, however we are talking about a REAL flamability issue with mineral-oil-based aircraft brake fluid. Not only does it (aero fluid) boil at low temps it *_supports_* combustion. For our purposes both are bad things. Brake fires are virtually unheard of at car races. That with rotors glowing orange 800-900°F?! It seems absurd that we don't use the best and safest product available.
Bill Jepson

Bill, the technical section of Matco's site says to use DOT 5 (at least, for all the master cylinder's that I've looked at).  Would any DOT 5 do, or are there strange variations that will ruin the seals if one isn't careful?

If it is available, I'd prefer to get something along the lines of the Lockheed 550 that Lynn mentioned (though, I don't plan on replacing it every other race 8*).  Such a small amount is required, that it doesn't really cost much to go from the very cheapest to the very best.  I just don't want to inadvertantly destroy the master cylinder O-rings in the process.

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