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  #1  
Old 01-30-2016, 09:16 PM
airguy's Avatar
airguy airguy is online now
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,593
Default Surprise during taxi testing

I'm only days away from first flight (waiting on current strong west winds to drop for my north/south runway) so I'm doing some taxi testing. Life is good - so much so that a good friend of mine wanted to ride with me and kick the rudders a bit for grins himself. In doing so we discovered an issue - the right hand copilot brake pedal was sticking and would not return. After he kicked the pedals around a bit, the right brake was dragging and quickly got hot. This is not something I would have caught until who knows when...

This is why we test - because we don't know the things we don't know.
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Greg Niehues - SEL, IFR, Repairman Cert.
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N16GN flying 900 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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  #2  
Old 01-30-2016, 09:38 PM
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Location: Utah
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Default

Good catch Greg. Remember there are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know. Keep testing.
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  #3  
Old 01-30-2016, 10:28 PM
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Infidel Infidel is offline
 
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Location: WV22
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Quote:
Originally Posted by Vlad View Post
Good catch Greg. Remember there are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know. Keep testing.
I think I know what you mean.
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  #4  
Old 01-31-2016, 06:54 AM
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Bill Boyd Bill Boyd is offline
 
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Location: Landing field "12VA"
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Default I'm impressed

Quote:
Originally Posted by Vlad View Post
Good catch Greg. Remember there are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know. Keep testing.
The Vladster is writing in his third language, here. That he follows his own discourse here is accomplishment enough to have my respect.

-Stormy
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  #5  
Old 01-31-2016, 07:44 AM
TX7A TX7A is offline
 
Join Date: Feb 2005
Location: Abilene, TX
Posts: 747
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Greg

There are some mods you can do to help keep the brakes from sticking.
I did the first two listed on the first post of this thread.
http://www.vansairforce.com/communit...ad.php?t=46755

Brakes work smoothly & pedals return where they should.

Sam
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  #6  
Old 01-31-2016, 08:26 AM
chipf chipf is offline
 
Join Date: Feb 2008
Location: Austin, TX
Posts: 179
Default Been there done that

I immediately had to add the return springs using the parts in Daryl's post.

Taxiing with sticky brakes was no fun at all.

I think I confirmed the right side was just as bad, and ordered parts for both sides.

Filling the brake system from the bottom up is a lot easier when the masters are fully disengaged!
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  #7  
Old 01-31-2016, 08:31 AM
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larrynew larrynew is offline
 
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Quote:
Originally Posted by chipf View Post
I immediately had to add the return springs using the parts in Daryl's post.!
Same here but only for the passenger side. Quick easy fix and no problems since.
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  #8  
Old 01-31-2016, 09:44 AM
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AltonD AltonD is offline
 
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Location: Dothan, Alabama
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I was in a one mile long departure line at Oshkosh. There I am, third from departure and my left brakes sticks. I am sure the guy behind me thought I was nuts. I did a 360 and luckily got it unstuck. I need to install the spring kit. Oh how I dread the dive under the panel.
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  #9  
Old 01-31-2016, 12:22 PM
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Pmerems Pmerems is offline
 
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Location: Tucson, AZ
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Quote:
Originally Posted by chipf View Post
I immediately had to add the return springs using the parts in Daryl's post.

Taxiing with sticky brakes was no fun at all.

I think I confirmed the right side was just as bad, and ordered parts for both sides.

Filling the brake system from the bottom up is a lot easier when the masters are fully disengaged!

I have some extra springs and nylon collars if you need them. Send me a PM
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Paul Merems (EAA Tech Counselor, EAA Sheetmetal Workshop Instructor/Volunteer 18 yrs)
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Tucson, Arizona 85749
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  #10  
Old 02-01-2016, 07:39 AM
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LettersFromFlyoverCountry LettersFromFlyoverCountry is offline
 
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Location: St. Paul, MN.
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Default

I built everything to Van's plans and had a dragging right brake on the initial testing. And even then, I've always had to reach back in to give the pedal a tug when getting out so that I could push it up the incline and back into the hangar.

During the most recent condition inspection, after changing brake pads (third set at 273 hours; the first set broke when they got frozen by packed snow after getting real hot, fun times in MN in the winter) and the O-rings on the disk, I spent a lot of time bleeding brakes.

I was positively anal about even the tiniest bubbles and while I created a murder-scene-lookalike in the hangar a few weeks ago, the difference now is un believable.

Yes, I did the whole "springs" thing etc, but in the end, I found the best way to get the brakes to work properly is to do a better job of bleeding the lines.
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Last edited by LettersFromFlyoverCountry : 02-01-2016 at 08:27 AM.
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