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wrjjrs@aol.com wrote:
Ernest,
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!)
Bill Jepson
"technically classified Dot 4" is the scary part. From Matco's website:
"Mil-H-5606 aircraft hydraulic fluid or compatible fluids are reccomended. DOT5 may be used but not DOT5.1 which contains glycol. DOT3 and DOT4 may not be used and will cause immediate damage to the seals."
It's the technicallities that will cause the immediate damage 8*) Are we reduced to ordering some extra seals when we order the brakes so that we can run a soak test for a few months before actually filling the brakes? I just ordered one of their MC-4 master cyclinders. I'd hate to ruin it right off the bat.
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