Create an account Home  ·  ·  Forums  ·  ·  Articles  ·  ·  Downloads  ·  ·  Photo Gallery  
Login
Nickname

Password

Don't have an account yet? You can create one here.

Navigation
· Home
· Article Archive
· Article Submit
· Downloads
· FAQ
· Forums
· Members List
· Photo Gallery
· Private Messages
· Web Links
· Your Account

Search Articles



Forums

Wiper motor...which is the correct one?
Lead additive, one more question.
M31C mount with or without replica weapon
Backfire and Hesitation
Wanted: Steering column and shaft for M38-1952, or late CJ2A
2024 CT. MILITARY VEHICLE SHOW AND FLEA MARKET- JUNE 15,2024
Brake Line
How to link full size photos in posts
Clutch release bearing support cast tab for return spring
T90 case replacement required?

Willys M Jeeps Forums


willysmjeeps.com :: View topic - M38 Brake shoe Adjustment
 Forum FAQForum FAQ   SearchSearch   UsergroupsUsergroups   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

M38 Brake shoe Adjustment

 
Post new topic   Reply to topic    willysmjeeps.com Forum Index -> Technical Knowledge Base
View previous topic :: View next topic  
Author Message
ChuckW
Member


Joined: Apr 17, 2005
Posts: 210
Location: Alabama

PostPosted: Tue Dec 17, 2019 10:21 am    Post subject: M38 Brake shoe Adjustment Reply with quote

On my 1952 M38, I have found that the brake shoes will not rotate on the bottom anchor pin eccentric when the nut is tightened. It's like the anchor pin tightens down on the shoe web before the brass eccentric cam, like the web of the brake shoe is thicker than the cam. I think I am correct in thinking that the shoes must be able to rotate on the cam in order to expand and contract against the drum. My thought is to lightly grind the web of the brake shoe until I get enough clearance for it to rotate on the cam. Anybody else had this problem? It appears to be only the front shoes, the rears seem to rotate freely with the bottom anchor pins nuts tight. These shoes were installed several years ago but have never seemed to work very well. The linings look like new on all 4 wheels!
_________________
Chuck W.
Dixie Division MVC #002
1952 M38/M100
M274A2
1964 CJ3B
Back to top
View user's profile Send private message
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Tue Dec 17, 2019 12:05 pm    Post subject: Reply with quote

Chuck, can you confirm completely stock M38 front brakes and back plates?

[mg]http://willysmjeeps.com/v2/modules/gallery/albums/album167/M38_vs_M38A1_a_001.sized.jpg[/img]


Incorrect dimensions on any of the Yellow Circled items in the next photo can cause either excessive tightness or slop to the lower shoe pivots. Those shoes should easily flop outward (fwd/aft) when the spring at the top is disconnected.



I would confirm the correct parts first. Then look at the linings, are they wider then the shoes? Any metal I decided to remove would be done in a way that the item remains centered or in it's correct relative position.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
Back to top
View user's profile Send private message Send e-mail Visit poster's website
ChuckW
Member


Joined: Apr 17, 2005
Posts: 210
Location: Alabama

PostPosted: Tue Dec 17, 2019 2:36 pm    Post subject: Reply with quote

Quote:
Those shoes should easily flop outward (fwd/aft) when the spring at the top is disconnected.

That's what I thought. The shoes are aftermarket, so I suspect they are the problem. I don't remember where I got them. I am going to pull the shoes off and measure the thickness of the web and compare to the thickness of the eccentric washer.
_________________
Chuck W.
Dixie Division MVC #002
1952 M38/M100
M274A2
1964 CJ3B
Back to top
View user's profile Send private message
ChuckW
Member


Joined: Apr 17, 2005
Posts: 210
Location: Alabama

PostPosted: Tue Dec 17, 2019 5:26 pm    Post subject: Reply with quote

After a closer inspection, the shoes are definitely the problem. Rather than try to make them work, I think I will order new shoes all the way around. There is no telling where these shoes came from, I didn't keep any records back then!
_________________
Chuck W.
Dixie Division MVC #002
1952 M38/M100
M274A2
1964 CJ3B
Back to top
View user's profile Send private message
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Tue Dec 17, 2019 11:33 pm    Post subject: Reply with quote

It will not always be the thickness of the web under the retaining plate (Item S) that will cause the binding. The width across the face of the shoe can also cause the binding if when the shoe inboard edge lies against the backing plate the web area of the shoe does not rest against the plate's mounting surfaces. The shoe's web should should just touch the mounting surface of the plate "S".


_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Jeff_Lee
Member


Joined: Jan 27, 2014
Posts: 151
Location: West Palm Beach FL area

PostPosted: Fri Dec 20, 2019 4:19 pm    Post subject: Reply with quote

Also check and make sure your eccentric (the little brass cam - part L in the drawing) doesn't bind in the hole in the shoe. They need to be a tight fit, but MUST rotate to adjust the shoe.

I recently bought some aftermarket eccentrics and they were slightly larger than the holes in the OEM Bendix shoes, which I had relined. The eccentrics I removed were a perfect fit. I suspect the newer parts were offshore parts that were slightly over tolerance.
_________________
1951 M38 restoration project - Flightline Jeep MC 23923 DoD 6-51
1954 M-100 Trailer USMC Dunbar Kapple s/n M-750759 DoD 1-54
1947 Willys CJ2A - Harvest Green
1954 Ford F-100 Parts chaser - blueprinted Y-Block
Southeast Florida
Back to top
View user's profile Send private message
ChuckW
Member


Joined: Apr 17, 2005
Posts: 210
Location: Alabama

PostPosted: Sat Dec 21, 2019 4:04 pm    Post subject: Reply with quote

New shoes came today. The web on the new shoes is a good .012" thinner than the old ones and the shoes will swing free with the bottom adjusting stud nuts tight now.
The lesson I learned, from now on, I will always measure the thickness of the brake shoe web and the thickness of the cam washer! Of course, at my age, this will probably be the last M38 brake job I ever do! Maybe it will help someone else!~
_________________
Chuck W.
Dixie Division MVC #002
1952 M38/M100
M274A2
1964 CJ3B
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    willysmjeeps.com Forum Index -> Technical Knowledge Base All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB © 2001 phpBB Group
Forums ©

 



PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.