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04-22-2016, 09:18 AM
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Join Date: Feb 2006
Posts: 165
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Brake fluid
Howdy again,
I can't find anything in the instructions of what type brake fluid to use. I have dot 4 Motul high temp fluid that I use on motorcycles.What do you think?
__________________
Craig Rufi
FLYING NOW AFTER 13+ YEARS. NICE FLYING AIRCRAFT!!
RV-10/Empennage/Wings/QB Fuselage/Wiring/Doors done finally, Cowling done. Stein panel complete, and connecting all those wires :-))Thousand Oaks, Ca. Dues paid for 2019
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04-22-2016, 09:22 AM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Do not use automotive brake fluid - too corrosive. Use Mil-spec hydraulic fluid. I don't have the numbers handy but there is the 'standard' one, and the recommended one with a higher flash point.
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04-22-2016, 09:35 AM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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Royco 782 is a good choice, I have a quart sitting in my garage which is probably about enough for two lifetimes. The more research you do the more options you'll find... some guys use ATF, I think. But MIL-PRF-5606H or MIL-PRF-83282 hydraulic fluids are the safe choices. Spruce has a good selection, as do other places.
The only universal no-no seems to be most automotive brake fluid.
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Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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04-22-2016, 09:39 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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+1 for Royco 782
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Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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04-22-2016, 09:48 AM
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Join Date: Aug 2006
Location: Taylor Texas
Posts: 812
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Mobil 1 ATF (available anywhere)
I use this stuff. The specs on the container suggest it complies with MIL-PRF-83282...
http://www.qclubricants.com/royco/royco_782.htm
https://mobiloil.com/en/automatic-tr.../synthetic-atf
You can buy it locally (anywhere) with no hazmat charges. I really like this aspect.
I'm gonna GUESS Dot 5 brake fluid might work (silicon based - the seals will thank you). I have heard that high altitude exposure allows the air in the Dot 5 to expand...but I have not had that experience (I use it in my motorcycle clutch system; had it to 10500MSL with no issues).
Carry on!
Mark
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04-22-2016, 12:20 PM
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Join Date: Oct 2012
Location: New Ulm, Minnesota
Posts: 283
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Royco 782 is the stuff to use.. I did some research on the best and safest brake fluid to use in aircraft and this is the stuff.. Can be found at http://www.skygeek.com/
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Robin Mckee
New Ulm, MN 56073
RV3b N219BB
420 hours and counting
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04-22-2016, 03:56 PM
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Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,261
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I'm not sure about aircraft grade brake fluid but I know that Auto grade brake fluid is hydroscopic (absorbs water) so you can't keep open containers for use later. Water in the fluid will boil and cause braking problems. Others that are more knowledgeable in this area can comment.
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Ray Tonks
2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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04-22-2016, 04:52 PM
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Join Date: Jan 2005
Location: Spring, TX
Posts: 233
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Quote:
Originally Posted by RV3bpilot
Royco 782 is the stuff to use.. I did some research on the best and safest brake fluid to use in aircraft and this is the stuff.. Can be found at http://www.skygeek.com/
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+1 MIL...83282 is the stuff to use. Aeroshell markets it as Fluid 31. It can be mixed with 5606 which is what you'll find at most GA repair shops.
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Greg
1950 Navion - flying
RV-6 - 18 yrs and 99.5% done
1940 Rearwin Cloudster project next
4 L-2 projects on deck
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04-24-2016, 08:56 AM
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Join Date: Feb 2006
Posts: 165
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Love this "Brain Trust". Thanks to all for your help....
__________________
Craig Rufi
FLYING NOW AFTER 13+ YEARS. NICE FLYING AIRCRAFT!!
RV-10/Empennage/Wings/QB Fuselage/Wiring/Doors done finally, Cowling done. Stein panel complete, and connecting all those wires :-))Thousand Oaks, Ca. Dues paid for 2019
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