Re: Fw: [Chrysler300] Center Plane Brakes

[JettLarry@xxxxxxx]

Popular wisdom when I worked for Mother Mopar was that Chrysler swapped  
it's excellent paint system to Ford for their brake system.  Both made  better 
cars that way.  So I remember.....L Jett
 
 
In a message dated 4/8/2009 1:14:32 P.M. Pacific Daylight Time,  
longrams@xxxxxxxxxxxxx writes:

What a  wealth of information a "little" brake squeal problem can bring to 
life!   This is what the list-server is all about! I am so glad to have some 
other  very knowledgeable members contribute to history. Hopefully, all the 
"young"  guys know what we are talking about. 
Having owned a '47 Ply, '48 Ply, '48  T & C Cvt., '51 Saratoga, '53 DeSoto 
cvt., '54 N.Yer. H.T. and a '55 Imp.  sedan, hands-on work was performed by 
me. Both the Saratoga Club Coupe and New  Yorker Special Delux 2 dr. H.T. (a 
Golden Falcon) was bought new by me. By the  way, that N.Yer. cost 
$4,711.53 out the dealer's door. To buy the comparable  car of today........$30K+?
Other than whatever had to be done by warranty,  I did all the other work 
by myself and loved it.
(Now I am really telling  you all just how old I am). 
George 





-----  Original Message ----- 
From: RWestra@xxxxxxx 
To:  longrams@xxxxxxxxxxxxx 
Sent: Wednesday, April 08, 2009 12:30  PM
Subject: Re: [Chrysler300] Center Plane Brakes


I worked on  the Center Plane brakes when they came out in the 50's and I 
recall problems  with squealing and grabbing.  I also recall the service 
bulletin George  Reihl referred to.  I tried the saw cut several times with 
mixed  success.  I, like George, have no idea why it was successful when it  
was.  

We also experienced problems with grabbing, or  pulling,  and had a great 
deal of difficulty correcting these  problems.  I believe this was the result 
of manufacturing variances in  the brake anchors and the variation of the 
profile of the heel on the  shoe.  

The Center Plane brake was Chrysler's last attempt to  avoid buying brakes 
from Bendix.  Chrysler had used a Lockheed design for  many years and fought 
hard to give in to Bendix.  The Bendix brake was  self energizing (it still 
is).  That is; the rotation of the drum against  the shoe when the brake 
was applied forces the shoe harder into the  drum.  Chrysler, with the Center 
Plane brake, accomplished this by the  floating heel of the shoe being in 
contact with an anchor that was placed on  an angle so the rotation of the 
drum against the shoe caused a wedging action  that forced the shoe into the 
drum making it "self energizing".  This was  an improvement over the fixed 
heel anchor of previous Chrysler brakes. The  concept was fine except the 
variation in cam position and the profile of the  heel of the shoe was very 
critical and resulted in the amount of self  energizing to vary causing pulling 
or grabbing.  This also changed over  the life of the brake.  

Chrysler used two forward shoes in each  front wheel and one forward shoe 
in each rear brake.  This meant that six  of the eight shoes were self 
energizing in the forward direction and actually  self de-energizing when in 
reverse.  Only the rear two shoes in the rear  brakes were self energizing in 
reverse.  This is why these cars are so  hard to stop in reverse.  

I believe it was the introduction of  the self adjuster by Bendix (and 
perhaps the problems with the Center Plane  brake) that finally caused Chrysler 
to say uncle in the mid sixties.   

Rolland Westra.   


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