ceengland7(at)gmail.com
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 Posted: Sun Sep 01, 2013 9:27 am Post subject: 3/16 vs 1/4 Brake Lines...thread drift to brake fluid |
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Best reason I've found for not using mil spec fluid is *synthetic* automatic transmission fluid; available everywhere, high temp, & compatible with original seals. The internet tubes tell me that Matco even recommends it.
FWIW,
Charlie
On 09/01/2013 12:12 PM, Dave Saylor wrote:
[quote] We've installed 3/16" lines on several Lancairs since some need a particularly small OD to fit past part of the landing gear. They work very nicely and don't seem any different than 1/4" lines.
I second the opinion about using MIL-PRF-83282. There's not really any reason not to.
Dave Saylor
831-750-0284 CL
On Sat, Aug 31, 2013 at 8:51 PM, Ed <decaclops(at)gmail.com (decaclops(at)gmail.com)> wrote:
| Quote: | --> RV-List message posted by: Ed <decaclops(at)gmail.com (decaclops(at)gmail.com)>
Nothing wrong with 3/16" lines operationally. They make for a harder pedal feel. We're not moving very much fluid to where the difference in size would be a detriment. Really, when you think about it, brakes are for run up anyway. I use the MIL-PRF-83282 synthetic brake fluid. Van's sells it as Royco 782. It has a higher flashpoint than 5606, but is completely compatible. That means you can find something that will work when you need some fluid away from home.
Ed Holyoke
On 8/31/2013 7:33 PM, Dan Bergeron wrote:
| Quote: | Dennis
Re use of 3/16" brake line instead of Vans' 1/4" - I'm not an engineer
but the folks who design airplanes at Vans Aircraft are - they use 1/4"
brake lines for a reason - my advice would be don't do it - there is a
serious safety issue here - braking action would almost certainly be
dangerously impacted - want to save a few ounces - Matt offered some
great advice - go on a diet -
Dan Bergeron
RV-7A - N307TB
425 hours since first
flight on 8/6/09
On Sat, Aug 31, 2013 at 9:34 PM, Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)
<mailto:dralle(at)matronics.com (dralle(at)matronics.com)>> wrote:
--> RV-List message posted by: Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)
<mailto:dralle(at)matronics.com (dralle(at)matronics.com)>>
At 06:22 PM 8/31/2013 Saturday, you wrote:
>--> RV8-List message posted by: Dennis Fox <dennisfox(at)persona.ca (dennisfox(at)persona.ca)
<mailto:dennisfox(at)persona.ca (dennisfox(at)persona.ca)>>
>
>My RV8a project is ready for wheels, and I keep thinking about the
brake system and lines. Seem to me like some weight could be saved
by going with 3/16 brake lines, (smaller line and less fluid).
Problem with small lines is the heavy viscosity of A/C hydraulic
oil, especially when cold. Solution would be automotive Dot 3 or
Dot 4, but are there compatability issues with the Matco master
cylinders and Cleveland calipers? Maybe new o-rings could solve the
problem? Anyone know the answer?
Hi Dennis,
Hum, you should actually put the parts and fluid between a 1/4" and
a 3/16" system on a scale and weigh them. I think that you're going
to find the difference in weight is almost negligible. Oh the other
hand, the difference in braking capabilities could be deadly.
Personally, I could stand to lose 50 lbs around my belly. That is
some realy weight savings that would make my RV fly a lot better. 
I've done a fair amount of custom stuff on my RV, but when it comes
to engineered stuff like the size of the brake lines, and other
dimensional stuff, Van's is the man. Van's hates fat airplanes. If
he felt that 3/16" brake lines would be adequate, I know for certain
that he would have used them.
Matt's $.02.
-
Matt Dralle
RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 172+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 180+ Hours Since Purchase - Upgrades Complete; Now In Full
Flyer Mode
Matt's Livermore Airport Live ATC Stream!
Check out the live ATC stream directly from my hangar at the Livermore
Airport. Includes both Tower and Ground transmissions. Archives too!
For entertainment purposes only. http://klvk.matronics.com
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