REFLECTOR: Brake Lines

Lawrence J. Epstein, MD ljepstein at hotmail.com
Thu Jun 19 07:46:17 CDT 2008


I ran aluminum tubing from the master cylinder to the gear BH then SS
braided Teflon hose from the gear BH, down the gear leg edge and to the
caliper.  I put a single ply of BID over the SS hose on the gearleg.

 

Larry Epstein 

173 FGE

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of bdtopp at comcast.net
Sent: Thursday, June 19, 2008 8:13 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Brake Lines

 

Unfortunetly, radiant heat from the brake disk is not the only problem.
Heat transfers from the caliper to the brass fitting for the nylaflow tubing
and then to the nylaflow tubing its self.  I noticed that the first 1" of
the nylaflow tubing that connects to the caliper gets pretty warm.  In my
case, heat transfer seems to be a bigger problem than the radiant heat.

 

Bruce Topp

XL-FG

 

-------------- Original message -------------- 
From: "Lou Stedman" <stedmanlou at roadrunner.com> 

> I had a similar situation but the lines did not break. They just expanded 
> enough to make brake action non-existent. I replaced my old lines with 
> Nylaflow but where it exits the gear leg I have wrapped it with the heat 
> reflecting mesh cloth and covered that with aluminum tape. It seems to
work 
> fine. It is all covered up by the wheel pant and can't be seen. 
> 
> 
> Lou Stedman 
> Velocity N7044Q 
> Olean, NY 
> ----- Original Message ----- 
> From: "Dave Philipsen" 
> To: "Velocity Aircraft Owners and Builders list" 
> Sent: Wednesday, June 18, 2008 10:48 PM 
> Subject: Re: REFLECTOR: Brake Lines 
> 
> 
> > While we'r! e on th e subject of brake lines I'll just throw in my two 
> > cents' worth. I have a STD FG with Nylaflow lines. The other day I was 
> > taxiing out to the runway and doing a lot of pumping on the right brake 
> > due to some crosswind and the fact that I haven't lubed my nose gear 
> > Belleville washer. I am not the original builder but my brakes have 
> > absolutely no heat shields to keep heat away from the gear leg or the 
> > brake line. Well, it finally caught up with me. During my run-up 
> > before takeoff, I was holding both pedals down and the right one gave 
> > way and just sank to the floor. To make a long story short, the 
> > Nylaflow tubing popped right out of the ferrule and fitting and sprayed 
> > all of my brake fluid out on the taxiway. Had to get towed back to the 
> > hangar. I figure that the heat caused some expansion/contraction 
> > problems whic! h cause d the line to blow out. Anyway, I ordered and 
> > installed a Stopflex brake hose made with a Teflon core, a Kevlar inner 
> > braid, an elastomer barrier, and stainless steel braid with a clear 
> > vinyl cover. They are advertised as having "no volumetric expansion" 
> > and surpass DOT specs. The Stopflex line is long enough to get inside 
> > where a fitting converts back to the Nylaflow for the rest of the way to

> > the master cylinder. I believe that the Nylaflow is ok but probably not 
> > well suited to hi-temp environments. So far, the Stopflex modification 
> > seems to perform as well or better than the Nylaflow that was there 
> > before in terms of 'soft pedal' or sponginess. 
> > 
> > 
> > 
> > NMFlyer1 at aol.com wrote: 
> >> Need some input: The original brake "Nylaflow" that came with my kit 
> >> isn't quite long enoug! h for t he 173 FGE. So, I bought some new
stuff. 
> >> They are the same OD, but not the same ID. The NEW stiff is thinner 
> >> wall and is too big for the compression inserts that came with the kit.

> >> 
> >> The Original part: S&L Plastics Nylaflow Pressure Tubing Type 3/16"H 
> >> SK8201 
> >> 
> >> The New Stuff: S&L Nylaflow Pressure Tubing Type 3/16"T SK8201 
> >> 
> >> I am guessing the "H" is Heavy Wall, and the "T" is thin wall. 
> >> 
> >> The inserts from the factory fit the heavy wall tubing (that is too 
> >> short for the airplane). 
> >> 
> >> The thin wall stuff is what the Wicks and Spruce Catalogs say is used 
> >> for brake lines. Spruce doesn't have an insert listed that I could 
> >> find, Wicks has one that says "3/16" part number 2030x4" 
> >> 
&! gt; > ;> What kind of Nylaflow is being used? If it is the thin wall
stuff, 
> >> what is the part number for the insert? 
> >> 
> >> I either need to order new (correct) nylaflow, or new (correct) 
> >> fittings. any input? 
> >> 
> >> Another screeching stop due to incorrect parts. 
> >> 
> >> Thanks Kurt 
> > 
> > -- 
> > Dave Philipsen 
> > Velocity STD-FG 
> > N83DP 
> > 
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