Hi Mark Sometimes I hate to say the obvious, however, My first thought would be you have an actual mechanical restriction in the way that is not allowing full travel on the pedal.
That not being the case, if you bled the brakes from the bottom up, it’s probably a mute point but if you bled the brakes from the top down, did you have full travel on the pedal when you bled the brakes? I do not know what would cause that scenario as you are correct Air would make the pedal spongy and maybe hard after pumping it. That’s all I got Keith Wiese On Wed, Jul 2, 2025 at 9:13 PM Jeff Scott via KRnet <krnet@list.krnet.org> wrote: > 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 > 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 > > flyk...@gmail.com > www.flykr2s.com > -- KRnet mailing list KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet > -- KRnet mailing list KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet >
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