Today's Message Index:
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1. 04:30 AM - Re: recommended RV brake fluid (Ed Anderson)
2. 05:43 AM - Re: recommended RV brake fluid (Kevin Horton)
3. 06:41 AM - Re: recommended RV brake fluid (Bob Leffler)
Message 1
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| Subject: | recommended RV brake fluid |
Having experienced a ruptured brake line and ensuing brake fluid fire while
using the 5606 fluid (Flash point around 240F), I strongly agree - use the
Mi.-PRF-83232 - it's flash point is around 440F. The nice part is - it's
fully compatible with the 5606 fluid so you don't have to flush your lines
or replace type of seal. Naturally the more 5606 left in the system the
lower the flash point from that of pure 83232. So using this fluid requires
no changes to the installation - and since it is compatible with 5606 - you
could always add 5606 (available at any FB0) if you find yourself needing
brake fluid while away from your gallon of 83232.
I would also suggest considering stainless steel, Teflon lined or other
"real" brake lines. My aluminum tubing apparently fatigued and blew a chunk
of the tubing wall out after an aborted take off (hot rotors). This could
have been a result of me "working" hardening it while curving it around the
landing rod, unnoticed damage or just material failure - but whatever the
cause, you want to avoid it. But, the spraying of the low flash point 5606
on the hot rotor caused the real excitement. The resulting fire ball rose
above the wing (as seen in video made by nephew), the brake peddle went to
the floor and an excursion off the runway followed. Upon stopping, I popped
the canopy and smelled burning resin - yes, the wheel pant was on fire and
burning just below the full wing tank!! Fortunately, the fire was quickly
put out and no damage to aircraft thanks to a small shallow ditch which
arrested further progress.
I know the aluminum tubing has been around a long time and used
successfully, but there have also been several reports of brake failure. At
least the SS brake lines are more likely to start seeping fluid than having
a catastrophic failure. The SS brake line less likely to fail. I even went
to the effort of adding rotors with double the thickness of standard rotors.
The idea was that given twice the mass of the thicker rotor the same heat
content would raise its temperature less. The side benefit of the thicker
rotors are no brake fade, more even wear on the pads and less frequent pad
replacement.
Just my $0.02 YMMV
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
<http://www.andersonee.com> http://www.andersonee.com
<http://www.dmack.net/mazda/index.html>
http://www.dmack.net/mazda/index.html
http://www.flyrotary.com/
<http://members.cox.net/rogersda/rotary/configs.htm>
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.rotaryaviation.com/Rotorhead%20Truth.htm
<http://www.dmack.net/mazda/index.html>
_____
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Vanremog@aol.com
Sent: Friday, August 28, 2009 1:33 AM
Subject: Re: RV-List: recommended RV brake fluid
IMO, don't bother with the crappy old 80 yr old MIL-H-5606 fluid. Get Viton
O-rings installed in your calipers and go with the updated (50 yr old)
higher performance fluid MIL-PRF-83282 developed after the military got
tired of putting out brake fires. Check the archives and get with the
program. A brake fire will ruin your day.
-N1GV
In a message dated 8/27/2009 7:56:01 P.M. Pacific Daylight Time,
bmeyette@gmail.com writes:
my RV-7A construction manual says I must not use automotive brake, but
instead "use only the aircraft brake fluid recommended by the manufacturer".
But they don't say what this fluid is. Does anyone know what fluids are
recommended for use with the standard Van's Cleveland disk brakes?
_____
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Message 2
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| Subject: | Re: recommended RV brake fluid |
The problem with MIL-H-5606 fluid is that it has quite a low flash
point (about 215 deg F). If your brakes are hot, and a line fails,
spraying brake fluid on the brake disk, you will have a fire. The
wheel pant will catch on fire too, and this whole thing is burning
away below the fuel tank. Several RVs have had brake fires.
Fortunately everyone so far has managed to get the fire put out
without losing the aircraft, but it is still something to attempt to
avoid.
MIL-PRF-83282 is a replacement to MIL-H-5606 that was developed by the
military, with a flash point of 470 deg F, or higher. It is fully
compatible with all the seals. It is not that much more expensive,
but it is a little harder to find. If you are on the road, and need
to top up your brake system, you can add some MIL-H-5606 fluid to the
MIL-PRF-83282, but the resulting mixture has a slightly lower flash
point.
I found Royco 782, a MIL-PRF-83282 fluid, at a local supplier (Leavens
Brothers in Toronto) for $12 a quart. It should be cheaper in the
USA. This fluid is specified for some corporate aircraft, so you may
find it at a local FBO.
--
Kevin Horton
Ottawa, Canada
On Thu, Aug 27, 2009 at 23:42, Brian Meyette<bmeyette@gmail.com> wrote:
> Would you, or anyone, happen to know the Cleveland web site? I googled
> "cleveland brakes" before sending the original message, but all I got was
> sellers, not the mfg site. Or their phone number woudl work, too.
> thanks,
> brian
> ________________________________
> From: owner-rv-list-server@matronics.com
> [mailto:owner-rv-list-server@matronics.com] On Behalf Of Randy Difani
> Sent: Thursday, August 27, 2009 11:08 PM
> To: rv-list@matronics.com
> Subject: Re: RV-List: recommended RV brake fluid
>
> Mil H 5606 normally is used for brake fluid and you can find it here
> http://www.aircraftspruce.com/search/search.php. Recommend that you go to
> the Cleveland website to be sure. Also, it's probably in your Cleveland
> Brake instructions. Do not use automotive, it'll melt the seals... Good
> luck and fly safe.
>
> ----- Original Message -----
> From: Brian Meyette
> To: RV7A@yahoogroups.com ; rv-list@matronics.com
> Sent: Thursday, August 27, 2009 10:52 PM
> Subject: RV-List: recommended RV brake fluid
> my RV-7A construction manual says I must not use automotive brake, but
> instead "use only the aircraft brake fluid recommended by the
> manufacturer". But they don't say what this fluid is. Does anyone know
> what fluids are recommended for use with the standard Van's Cleveland disk
> brakes?
> thanks,
> brian
>
Message 3
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| Subject: | recommended RV brake fluid |
Skygeek has Royco 782 for $8.14 a quart
http://www.skygeek.com/royco-782-synthetic-fire-resistant-hydraulic-fluid.ht
ml
bob
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Kevin Horton
Sent: Friday, August 28, 2009 8:42 AM
Subject: Re: RV-List: recommended RV brake fluid
The problem with MIL-H-5606 fluid is that it has quite a low flash
point (about 215 deg F). If your brakes are hot, and a line fails,
spraying brake fluid on the brake disk, you will have a fire. The
wheel pant will catch on fire too, and this whole thing is burning
away below the fuel tank. Several RVs have had brake fires.
Fortunately everyone so far has managed to get the fire put out
without losing the aircraft, but it is still something to attempt to
avoid.
MIL-PRF-83282 is a replacement to MIL-H-5606 that was developed by the
military, with a flash point of 470 deg F, or higher. It is fully
compatible with all the seals. It is not that much more expensive,
but it is a little harder to find. If you are on the road, and need
to top up your brake system, you can add some MIL-H-5606 fluid to the
MIL-PRF-83282, but the resulting mixture has a slightly lower flash
point.
I found Royco 782, a MIL-PRF-83282 fluid, at a local supplier (Leavens
Brothers in Toronto) for $12 a quart. It should be cheaper in the
USA. This fluid is specified for some corporate aircraft, so you may
find it at a local FBO.
--
Kevin Horton
Ottawa, Canada
On Thu, Aug 27, 2009 at 23:42, Brian Meyette<bmeyette@gmail.com> wrote:
> Would you, or anyone, happen to know the Cleveland web site? I googled
> "cleveland brakes" before sending the original message, but all I got was
> sellers, not the mfg site. Or their phone number woudl work, too.
> thanks,
> brian
> ________________________________
> From: owner-rv-list-server@matronics.com
> [mailto:owner-rv-list-server@matronics.com] On Behalf Of Randy Difani
> Sent: Thursday, August 27, 2009 11:08 PM
> To: rv-list@matronics.com
> Subject: Re: RV-List: recommended RV brake fluid
>
> Mil H 5606 normally is used for brake fluid and you can find it here
> http://www.aircraftspruce.com/search/search.php. Recommend that you go to
> the Cleveland website to be sure. Also, it's probably in your Cleveland
> Brake instructions. Do not use automotive, it'll melt the seals... Good
> luck and fly safe.
>
> ----- Original Message -----
> From: Brian Meyette
> To: RV7A@yahoogroups.com ; rv-list@matronics.com
> Sent: Thursday, August 27, 2009 10:52 PM
> Subject: RV-List: recommended RV brake fluid
> my RV-7A construction manual says I must not use automotive brake, but
> instead "use only the aircraft brake fluid recommended by the
> manufacturer". But they don't say what this fluid is. Does anyone know
> what fluids are recommended for use with the standard Van's Cleveland disk
> brakes?
> thanks,
> brian
>
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