> Subject: Brake fluid
>
> To: Chevron employee.....
>
> Does Chevron make this stuff MIL PRF 83282??
>
> Its high temp brake fluid that's compatible with 5606. The RV crowd is
>
> switching to it 'cause its less likely to flame up when you brake
hard...
>
> I'll order a gal if you have a supplier...
>
> Thanks!! TTYL,
>
> [Chevron sold the specialty aviation fluids business (that means brake
>
> fluid among other things) to Exxon in 1996; when we bought Texaco in
>
> '2001, we ended up marketing some Texaco aviation products, but I'm not
>
> certain who blends them. But no, there doesn't appear to be this
>
> synthetic brake fluid in the Chevron catalog. ExxonMobil makes it, and
>
> I see that Royco repackages it for $25/gallon. And the nice folks at
>
> ACI Lubes would be delighted to sell you a gallon via mail order:
>
>
_http://commerce.acilubes.com_ Let us know how it works out! ]
>
> Marc Weise
>
> Marc,
> The 83282 fluid is an aircraft synthetic hydraulic fluid (not really
a brake
> fluid, but on aircraft we use hydraulic fluid for our brakes). The Air
> Force changed over to it in the early 80's to reduce fires caused by
> hydraulic leaks on brakes and in engine bays. We had no seal
compatibility
> issues changing over.
> Do a google search on "83282 hydraulic fluid" and there are many
suppliers
> for small qty purchaces.
> Hope this helps,
> Larry
I would say the best synthetic hygroscopic hi-temp brake fluid is
commercially available from elf.
It's good enuf for Renault F1 team! Not cheap, but available.
"Yogi"
Yogi,
A great big caution on using automotive racing brake fluid in aircraft. The
seals used on aircraft brake systems are not compatible with automotive
brake fluids! They are designed to work with 5606 or 83282 fluids. Every
seal in the system would have to be changed to be compatible with the
racing
fluid.
We even have issues between different brands of racing brake cylinders and
different racing brake fluids! A further downside, is automotive brake
fluid
eats most paint... so spill a drop and there goes your expensive paint
job....
Larry
Larry,
This is only partially correct. Many of the seals used ARE compatible
with auto fluids.
Matco claimed all of the brakes we use from them are compatible.
Cleveland maintains
they are not. Dot 5 synthetics are non-paint spoiling, although they
aren't as good as
The DOT 4 hi temp variants. DOT 5 is silicone based and is more than
adequate for our
mild braking needs. Hi-temp DOT4 is a better brake fluid than any of the
aircraft types.
I have never had a problem getting it on my paint. Catalyzed
Polyurethane (Most new
paints) are tougher anyway. You would have to leave a puddle of fluid on
the paint for
a long time to have any problems. If you spill wipe it off! Personal
rant warning...
I think it is almost criminal that certification leaves us stuck with
such poor products as
the low temp oil based "standard" aircraft fluids. In all my years of
car and motorcycle
racing I NEVER saw or heard of a brake based fire caused by a fluid
leak. In the time I've
been working on planes (about 1/2 as long) I have knowledge of at least
4 brake fires just
among the people I know personally! Believe me a brake fire will REALLY
screw up your
paint BTW. I'm surprised that the manufacturers haven't been forced to
change by
lawsuits over the easily combustible nature of standard aircraft brake
fluid. I really hate
litigation so I am loathe just to mention that last comment. My RV-10
will be using a high
quality automotive brake fluid even if I have to change the seals, or
even the brakes
themselves if needed. I won't have my plane consumed in a fire that
is TOTALLY PREVENTABLE.
FWIW
Bill Jepson
Bill,
I totally agree that the dot 4 fluid is far superior to the hydraulic fluid
spec'd. I was just warning so people wouldn't think they can switch without
some homework up front. If your building your own system, the master
cylinders from Tilton are the ones we use all the time with Motul racing
fluid. Best fluid I have ever found for endurance road racing. But Motul
will kill the seals in a Willwood master cylinder, even though it is
supposed to be compatible.
Larry
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