We expect to see Wunderbird in Sept. Safe flights. Roger Sent from my iPhone On Jul 4, 2025, at 11:18, mark jones via KRnet <krnet@list.krnet.org> wrote:
Hello all.
Brake issue resolved. First are thank you to all who replied with suggestions. Turned out to be the axle nut was too tight causing binding on one of the caliper slides. A 1/4 turn loosening the wheel solved it.
Thanks again everyone.
From: KRnet <krnet-boun...@list.krnet.org> on behalf of Jeff Scott via KRnet <krnet@list.krnet.org>
Sent: Wednesday, July 2, 2025 9:15:50 PM
To: krnet@list.krnet.org <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
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.
Mark Jones (N771MJ)
Oldsmar, FL
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