While I have not done this, it is my understanding that if you have no joints in your brake lines, you can cut the ends off the 1/4" lines and thread the 1/8" lines down through them. That way you don't have to fish everything through the wing root or change out your brake line supports.
-Jeff Scott
Arkansas Ozarks
Sent: Wednesday, July 02, 2025 at 8:15 PM
From: "Jeff Scott via KRnet" <krnet@list.krnet.org>
To: krnet@list.krnet.org
Cc: "Jeff Scott" <jscott.pla...@gmx.com>
Subject: Re: KRnet> Brakes
From: "Jeff Scott via KRnet" <krnet@list.krnet.org>
To: krnet@list.krnet.org
Cc: "Jeff Scott" <jscott.pla...@gmx.com>
Subject: Re: KRnet> Brakes
Mark,
I often times find braking issues where you get a hard pedal, but little brake action when they are constructed using 1/4" nylaflow tubing for the brake lines. With a longer run to the right brake, you tend to lose more of your braking authority to wall expansion (stretching) of the 1/4" plastic. The easy fix is to replace the /14" nylaflow with either 3/16" or 1/8" nylaflow. The smaller tubing still stretches, but the surface area is so much smaller that the brakes still work well. I found this issue on my KR 28 years ago, then replaced the tubing with 3/16" Nylaflow, which was still in it when I sold the plane 24 years later. I have fixed brake issues on numerous EAB aircraft by swapping out the 1/4 to 3/16" lines. Arion Lightnings now recommend using 1/8" nylaflow lines for brakes. This may or may not be your problem, but if you have 1/4" nylon or plastic tubing, I would bet on it.
-Jeff Scott
Arkansas Ozarks
Sent: Wednesday, July 02, 2025 at 8:31 AM
From: "mark jones via KRnet" <krnet@list.krnet.org>
To: "KRnet" <krnet@list.krnet.org>
Cc: "mark jones" <flyk...@gmail.com>
Subject: KRnet> Brakes
From: "mark jones via KRnet" <krnet@list.krnet.org>
To: "KRnet" <krnet@list.krnet.org>
Cc: "mark jones" <flyk...@gmail.com>
Subject: KRnet> Brakes
Hell All,
I am so ready to fly WunderBird. I have all issues resolved with the exception of my right brake. It is a Grove caliper with Matco toe operated master cylinder. My issue is no braking authority to amount to much. I really have to fight it to get it to turn right. The pedal is hard. It will only depress about 1/4 of an inch. If I pump it, I get some braking but nowhere near enough. I can make a left turn on a dime with ease. The left pedal has a good inch of depression. Is there too much fluid in the right system? Can air in the system cause a hard pedal? I thought air in a system creates a mushy pedal. Any help or ideas are much needed and appreciated. As soon as this is corrected, there will be another KR in the air.
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