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  #11  
Old 11-17-2007, 05:46 PM
Larco Larco is offline
 
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 882
Default Springs

There is a person here at DVT that has made up a kit consisting of 8 step bushings and 4 springs. Bushings for the top rest against the washers and the bottom to protect the cylinder housing. Most of the locals now have them installed and love them. I think he wants 25 bucks and well worth it. If interested send me a PM and I'll give you the contact info. Larco
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  #12  
Old 11-17-2007, 08:58 PM
sf3543 sf3543 is offline
 
Join Date: Jan 2005
Location: San Antonio, TX
Posts: 862
Default Keep it simple

You really don't need all of the fancy collars, etc for this fix. (Although go for it if you like.)
All you really need is the two springs, which you can pick up at HD, Lowes or a local spring shop (Ace Spring, here in San Antonio) for about $2 or less, and some washers, which you probably already have.
Just take the top of the brake master attachment loose at the top of the pedal, freeing the shaft. Slide on a fender washer, then the spring and then another fender washer. (I forget what size washers were needed, but they were a regular AN size, maybe AN5. For the correct spring length, measure the length of the shaft that is exposed and get one a little longer and of a diameter that just fits over the shaft.) If the spring needs more tension, just add some additional smaller washers at the top and put the AN3 bolt back on. Finished!
I did this and it worked great, eliminating the tendency for my brakes to drag. It is also something that you can do without disassembling the rudder pedals, etc.
Good luck.
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Steve Formhals
RV6, RV8 (2), RV12 & RV3 about 2/3 done.
A&P, Tech Counselor & Flight Advisor
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  #13  
Old 05-11-2008, 07:54 AM
IowaRV9Dreamer's Avatar
IowaRV9Dreamer IowaRV9Dreamer is offline
 
Join Date: Jan 2005
Location: Marion IA
Posts: 1,069
Default MDS filled Nylong bushings?

Quote:
Originally Posted by LifeofReiley View Post
I used the following from McMaster Carr
www.mcmaster.com/
(1) Pkg 6389K625
Nylon Bearing Flanged, for 3/8" Shaft Dia, 1/2" Od,
3/8" Length, Packs of 5 $1.97 Pkg
(1) Pkg 9657K115
Steel Compression Spring Zinc-Plated Spring-Tempered, 3"
L, 1/2" Od, .047" Dia, Packs of 12 $5.29 Pkg
(4) Ea. 9946K13
Aluminum Set Screw Shaft Collar 3/8" Bore, 3/4"
Outside Diameter, 3/8" Width $1.82 EA.
For anyone who has used these, can the spring be wound around the outside of the flanged Nylon bearing? I'm thinking of using a bearing at both ends.

I'm also considering using a slightly different part number for the bearing (6294K89) which is the "MDS Filled Nylon" version. It is slightly cheaper but more importantly (from the McM-C website):

MDS-Filled Nylonó Provides the same qualities as nylon, with the addition of wear-resistant molybdenum disulfide (MDS), which makes it self lubricating

Anyone have experience with these?
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Dave Gribble VAF #232
Building RV-9A N149DG (slider, IO-320, IFR)
Restored and Flying Beech Super III N3698Q
Marion IA

Restarting the project after too many years off

There is no sport equal to that which aviators enjoy while being carried through the air on great white wings." Wilbur Wright, 1905
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  #14  
Old 05-11-2008, 08:05 AM
pdecraene7a pdecraene7a is offline
 
Join Date: Jan 2005
Posts: 136
Default SPRINGS

George

I found that replacing the bolts that the pedal pivots on did more to help the brake release than the springs did. We replaced he 2 short bolts with one long bolt, I don't remember the length, but I'm sure someone here could tell you. With 2 short bolts the pedal tends to bind on the bolts if there is any play from side to side, with a single bolt this is eliminated.
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Pete DeCraene
Joliet, IL
RV-7A CONVERTED TO RV-7 526PD
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  #15  
Old 05-11-2008, 08:58 AM
nucleus nucleus is offline
 
Join Date: Sep 2006
Location: Bozeman, Montana
Posts: 853
Talking A Simple Way...



All I did was buy some 5x1/2 inch springs at Ace. I don't think you need washers or anything else...
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Dr. Hans Conser
Bozeman Chiropractor
RV-6A 195 Hours, up for sale soon?
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  #16  
Old 05-26-2008, 02:34 PM
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RONSIM RONSIM is offline
 
Join Date: Feb 2008
Location: Largo, FL
Posts: 758
Default Replacing my bungy cords

I will be replacing my (aircraft quality) bungy cords with springs this week. Found everything I need ( thanks to some great pictures posted in the threads) at Lowe's and H-D. Bungy cords worked fine for a temporary fix -- but they look tacky and the colors did not match my interior.
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  #17  
Old 05-26-2008, 05:46 PM
Kevin Horton's Avatar
Kevin Horton Kevin Horton is offline
 
Join Date: Jan 2005
Location: Ottawa, Canada
Posts: 2,342
Default

Quote:
Originally Posted by nucleus View Post
Are my eyes playing tricks, or is there a lot of air in those brake lines?
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RV-8
Ottawa, Canada
http://www.kilohotel.com/rv8/
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  #18  
Old 10-04-2010, 09:11 PM
MauiLvrs's Avatar
MauiLvrs MauiLvrs is offline
 
Join Date: Jan 2008
Location: KTCY
Posts: 642
Default Current Prices from McMaster

(1) Pkg 6389K625
Nylon Bearing Flanged, for 3/8" Shaft Dia, 1/2" Od,
3/8" Length, Packs of 5 $2.26 Pkg

(1) Pkg 9657K115
Steel Compression Spring Zinc-Plated Spring-Tempered, 3"
L, 1/2" Od, .047" Dia, Packs of 12 $6.00 Pkg

(4) Ea. 9946K13
Aluminum Set Screw Shaft Collar 3/8" Bore, 3/4"
Outside Diameter, 3/8" Width $1.91 EA.
Quote:
Originally Posted by LifeofReiley View Post
RV Brake Spring Parts List

I used the following from McMaster Carr
www.mcmaster.com/
....
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Dave & Trina
RV-9A Flying - 330 Hrs. Painted Finishing the interior.
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  #19  
Old 02-20-2011, 08:03 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,368
Default

Quote:
Originally Posted by sf3543 View Post
You really don't need all of the fancy collars, etc for this fix. (Although go for it if you like.)
All you really need is the two springs, which you can pick up at HD, Lowes or a local spring shop (Ace Spring, here in San Antonio) for about $2 or less, and some washers, which you probably already have.
I just did what Steve did too. I got the springs at Ace (Home Depot and Lowes didn't have nearly as good a selection). They are 5/8" x 3"x 080 compression springs. Four of those and 8 stainless steel 3/8" washers (2 washers per master cylinder) cost about $8.00. Plenty of spring back, and more could be had if necessary just by adding a few washers. Also, with this setup, no worry that a collar/set screw might come a bit loose later without knowing.

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Ellensburg WA
RV-9 Flying, 0-320, Catto

Donation reminder: Jan. 2018

Last edited by alpinelakespilot2000 : 02-20-2011 at 08:09 PM.
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  #20  
Old 02-20-2011, 08:38 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 2,079
Default

Quote:
Originally Posted by nucleus View Post


All I did was buy some 5x1/2 inch springs at Ace. I don't think you need washers or anything else...
Matco tech support advised me against using spring without any protective washer/bushing on the shaft as it could damage/scratch the shaft. If you are going to add spring, then use all the appropriate washers and plastic bushings.

Regards
Mehrdad
P.S. there seem to be a lot of air in those lines.
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RV7A - IO360M1B - SOLD
Dues paid

Last edited by Bavafa : 02-20-2011 at 08:43 PM.
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