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Air brake tubing questions

Posted By naylorbros Tuesday, February 21, 2012 9:19 AM
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naylorbros
 Posted Tuesday, February 21, 2012 9:19 AM
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HI!!  I am starting to replace all of the air lines on my truck.  Everything on it is Aeroquip and I am going to change all of the air lines to nylon.  I have decided on the NTA type fittings form Parker.  My questions are about the tubing.  Parker lists two types of tubing for air brakes.  A type A and a type B in their Parflex tubing.  The type A is a single wall extruded tubing and they type B is a fiber reinforced tubing.  Now to the questions.
1.  Which type of tubing is best to use.
2.  Can I use all one color (black) on the whole truck or do I need to use different colors for different line types
3.  Can nylon line be used between the compressor and the first air tank.

Thanks
Ken
jungerfrosch
 Posted Tuesday, February 21, 2012 10:10 AM
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Not sure about the first two, but you cannot run nylon from the compressor.  It will get too hot for the nylon, they make special lines in various lengths for the compressor run, or I'm sure you can make your own.  If you have a copper line there now you could always leave that section alone.

Tad





46 Chevy OS 1.5 ton, 47, 48 & 49 IH KBS-8-1, 51 IH L195 Wrecker, 60 IH RF195, 64 F250 16ft flatbed, 65 Datsun 320, 72 IH Travelall
Geoff Weeks
 Posted Tuesday, February 21, 2012 3:14 PM
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Nylon can not be used where there is movement between parts. Nylon can only be used in places that could use solid copper (ridged runs).  Some sort of hose is required where there is movement, either Areoquip or rubber.  Stainless braid over teflon is what is commonly used for compressor discharge line. It is good to 400 deg or so.

 As to color, it is up to you. Color codeing helps when working on the system, but isn't required.
Aaron
 Posted Tuesday, February 21, 2012 7:14 PM
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I believe you can use either type line, but the inner sleeve may not fit on the reinforced line.
 You'll also need to us\e a stainless braded line from the compressor for at least 2 to 3 feet you don't need to go all the way to the wet tank with it, but you should use areoquip fro the rest of the run to the wet tank,. I believe copper is a no no any more for the compressor line.
 You also want to use air brake hose from the frame rails to the rear ends, then from there to the brake pots you can use areoquip or the plastic line.


I can't get anymore out of it, I've got both sticks hot clear up to the knobs allready.
www.killcarb.org
naylorbros
 Posted Wednesday, February 22, 2012 7:19 AM
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HI!!   Thanks for the responses.  The compressor already has the copper line off of it and then Aeroquip for the copper to the first air tank.  I had planned on replacing the aeroquip with aeroquip but thought that I would see what everyones thoughts were.  The frame to axle hoses will be replaced with like hosed.  I and just looking at changing all of the old line that are in the frame and cab area. 
Any problem with going with all black tubing?
Thanks
Ken
kblackav8or
 Posted Wednesday, February 22, 2012 7:46 AM
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I have already swapped out quite a bit of my old copper for nylon and you want the non-reinforced stuff for push on fittings.  McMaster-Carr has it online in a variety of colors to length if you don't have an easy local source. 
http://www.mcmaster.com/#d.o.t.-tubing/=gd1gyc

They also have the fittings that go with in several different variations.  I find them to be same or less then my dealer - my dealer might be expensive though so shop around.  Ryder Fleet also carries this stuff online. 



Aaron
 Posted Friday, February 24, 2012 1:59 PM
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Kevin seems to have confused the issue with push on, thats not used for frame rail air line, that is generally used for your under dash and air horn lines you'll have to get the correct line for the push on  for that, it does make the under dash work easy, you'll want to use the unrenforced plastic line as has been said before with the correct barrel and inner sleeve that fits so that the line doesn't crush.

I can't get anymore out of it, I've got both sticks hot clear up to the knobs allready.
www.killcarb.org
kblackav8or
 Posted Friday, February 24, 2012 2:23 PM
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I think the push-ons are now OK.  As long as they are marked DOT and comply with FMVSS 106.  My dealer/s have been selling them that way.  All the stuff I have used says DOT on it. 

Updated in 2008 so it is possible the push-ons weren't ok in the past.  The ones I have have an inner sleeve similar to the threaded ones. 
http://www.nhtsa.gov/DOT/NHTSA/Vehicle%20Safety/Test%20Procedures/Associated%20Files/TP-106-10.pdf

I am leery of the plastic composite fittings but apparently there is a range of them that are OK now too.
http://www.legris.com/jahia/webdav/site/legris/shared/GENERAL/Documentation/DOT%20SAE%20Fittings_US.pdf

http://www.hydraulichouse.com/pdf_files/new/3501/3501-I.pdf

Parker hose says:
Advantages
The design of the Parker PTC Composite Air Brake Fitting Complies
with the performance requirements of D.O.T. FMVSS 571.106, SAE
J1131 and SAE J2494-3.
No special tools are needed to assemble. Just bottom the tubing in the
fitting for a positive seal. Tube support design assures maximum flow.
Brass componentry includes a shoulder on the collet for increased side
load capabilities, contamination resistance features and tight internal
tolerances for a close fit and smooth operation.
Application
Use with Parker Parflex SAE J844 type A & B nylon tubing. Designed
for all D.O.T. truck and trailer applications. Consult the factory with
any questions regarding special product applications. Prior to use, all
applications should be carefully tested through the range of conditions
which may be encountered.




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