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Date: Mon, 09 May 2005 14:31:37 -0400
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From: Clark Baker <bakercdb@gmail.com>
Reply-To: Clark Baker <bakercdb@gmail.com>
Subject: DHI brake lines
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The recent report on the LML about another Nylaflow brake line failure
got me motivated to finally replace the nylaflow brake lines on my
360.  Although they have been problem free for 600+hours and 5+ years,
I have always felt they were marginal at best and unsafe at worst
given the high landing speeds of our planes and that the brakes also
provide the steering.

Rather than replacing the last several feet with stainless braided
hose (which still leaves the nylaflow for the rest of the run), I
decide to use a single run of DHI instrument line, which was
recommended by Brent Regan some time ago.  The DHI is very
lightweight, with three-ply braided polyamide construction, higher
temperature rating, much higher burst strength, a small 15/16" bend
radius, and UV/ozone proof.  For additional protection, I used spiral
nylon wrap around the exposed section running to the wheel.

I now notice that the brake pedals have a firmer feel.  The tubing is
not cheap ($125 each), but well worth the much higher possible costs
if the cheap nylaflow burst. Now, next step this Spring is to replace
the Matco brakes (leaking again) with the Groves that I recently
purchased.

The parts I chose are listed below

DHI
2 quantity - 13' (156")flexible tube with 1/8" Gyrolok nuts and
ferrules installed:
F1818NF-156
www.dhinstruments.com

HOKE Gyrolok,
4 quantity -  2LM2(BR) - Male elbow 1/8 tube, 1/8 NPT
www.hoke.com