Dot 5 is the silicone based fluid. Dot 5 is compatable with almost any seal material. Most of the racing fluids mentioned are technically classified Dot 4. The performance fluids dramatically exceed the Dot 4 requirements. Any manufacturer that doesn't use at least buna-n or EPDM (viton) seals are almost criminally negligent. There is NO reason, cost or otherwise not to use a modern seal material. Viton is as cheap as any other these days. I am supprised that liability hasn't forced aircraft brake manufacturers to modernize their equipment. (I despise lawsuits, but I'm supprised someone using the standard fluid who burned their plane down hasn't sued forcing them to update!)
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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