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Mod IV wheels and brakes

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occom

Joined: 26 Aug 2006
Posts: 404

Posted: Tue Jul 14, 2009 3:44 pm Post subject: Mod IV wheels and brakes

I have a Mod IV with 8" aluminum wheels that have a  3 lug iron disc bolted to them. I have not flown this yet but wanted to rebuild  the brakes. 

  

 After installing the Matco rebuild kit and bolting  it all back together I noticed that neither disc runs true with about 1/8" or  more of radial runout. Both run true axially. 

  

 I can't detect any real damage to this setup and  wondered is this typical of Kitfox's. How does it affect braking?  

   [quote][b]

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dwight purdy

Joined: 10 Feb 2006
Posts: 85

Posted: Tue Jul 14, 2009 3:56 pm Post subject: Mod IV wheels and brakes

I have had that problem after the tires were  changed and they bent the rims. I re-cut the lugs some and shimmed the one that  did not clean up. The brakes do not work well if the run out much.

  

 Dwight Purdy    

 Model II

 [quote]   ---

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dwight
model II

dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Tue Jul 14, 2009 6:29 pm Post subject: Re: Mod IV wheels and brakes

Dave, 

Question is what it not running true ? 



Wheel , hub or tabs welded on........  Put on a lathe and spin it.



Go from there. 



Rotor itself likely not the cause.



Dave

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patreilly43(at)hotmail.co
Guest

Posted: Tue Jul 14, 2009 6:30 pm Post subject: Mod IV wheels and brakes

Dave C The Mod 3 I am rebuilding had a 1/16" aluminum shim between the brake disc and the rim on one mounting bolt. The wheels I have are pretty well beat up so it isn't surprising the disc is shimmed. But C that would be what you call axial run out I think. Seems like 1/8 " radial run out would be quite alot of radial run out. I don't know how you would correct radial runout except to relocate & redrill 3 new mounting holes in the disc C if I am understanding your radial C axial terminology.

  

 Pat Reilly

 mod 3 582 Rebuild

 Rockford C IL

 

  From: dpurdy(at)comteck.com

To: kitfox-list(at)matronics.com

Subject: Re: Kitfox-List: Mod IV wheels and brakes

Date: Tue C 14 Jul 2009 19:52:36 -0400



    I have had that problem after the tires were changed and they bent the rims. I re-cut the lugs some and shimmed the one that did not clean up. The brakes do not work well if the run out much.

  

 Dwight Purdy    

 Model II

 [quote] ---

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Tue Jul 14, 2009 6:39 pm Post subject: Re: Mod IV wheels and brakes

[quote="dwight purdy"]I have had that problem after the tires were  changed and they bent the rims. I re-cut the lugs some and shimmed the one that  did not clean up. The brakes do not work well if the run out much.

  

 Dwight Purdy    

 Model II

  	  Quote: 	
		     --- 	


HArd to bend  ATV wheels if you use the  correct tools. 



http://www.cfisher.com/kingfox.html

Dave

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lcfitt(at)sbcglobal.net
Guest

Posted: Tue Jul 14, 2009 7:21 pm Post subject: Mod IV wheels and brakes

Dave,



I'll take a stab at this.  First, as I understand your post, when you spin 

the wheels, the brake linings run true with the disk as it spins,but the 

disk dances up and down between the linings.  If this is the case, I think 

the worst case scenario would be a slight out of balance when you leave the 

ground and the wheel continues to spin a bit.



Many guys trim the brake disk in a fashon that eliminates all metal not 

touching the linings with three tabs that connect to the bolts.  You could 

do this by marking the disks as they spin and using a metal cutting band 

saw.  The metal is cast iron and cuts pretty easily.



I just re-read your post and it appears that they might already be trimmed. 

If so try rotating them by 1/3rd and see if this trues it a bit.  Are you 

the original buider?  If they they are trimmed and don't run true, I don't 

think braking would be seriously affected as some will drill lightening 

holes in the braking face without diminishing brake effeciency.  The latter 

is just an opinion, though.



If I misunderstood what is not running true, disregard.



Lowell Fitt

Cameron Park, CA

Model IV-1200 R-912 UL

Covering



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dwight purdy

Joined: 10 Feb 2006
Posts: 85

Posted: Tue Jul 14, 2009 8:23 pm Post subject: Mod IV wheels and brakes

Dave

 I have never been able brake down the tire from rim after installed with 

that black goo. The place I take them used to do a nice job. I think the new 

young hires are the problem. This is not strictly an ATV shop but they do 

allot of small lawn tires. Those are steel though.



Dwight Purdy

model II

---

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dwight
model II

dwight purdy

Joined: 10 Feb 2006
Posts: 85

Posted: Tue Jul 14, 2009 8:43 pm Post subject: Mod IV wheels and brakes

I guess I had axial and radial turned around.



Dwight Purdy

model II

---

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dwight
model II

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