Re[2]: {Chrysler 300} Brake master cylinders for 56-61 Chryslers - heads
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Re[2]: {Chrysler 300} Brake master cylinders for 56-61 Chryslers - heads up



Thanks for the suggestion James but White Post does not guarantee their resleeve work when the part is used with DOT5.  I have no idea why that matters, maybe you know.
This was a conversion on a 300G to DOT5 from unknown fluid use (most likely a mix of DOT3 and DOT5, as the P.O had dementia and could not remember what he had been using over the years) 
Hence the use of a new master (along with new wheel cylinders, alcohol flush of lines etc.)

Carl

------ Original Message ------
From "James Douglas" <jdd@xxxxxxxxxx>
To "dave mason" <forwardlook300@xxxxxxxxx>; "Carl Bilter" <cbilter@xxxxxxxxx>
Cc "chrysler-300-club-international@xxxxxxxxxxxxxxxx" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Date 7/1/2024 6:54:46 PM
Subject RE: {Chrysler 300} Brake master cylinders for 56-61 Chryslers - heads up

Send and old one to White Post and have it sleeved.  Put in new guts. 

 

James

 

From: 'dave mason' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Monday, July 1, 2024 16:25
To: Carl Bilter <cbilter@xxxxxxxxx>
Cc: chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: {Chrysler 300} Brake master cylinders for 56-61 Chryslers - heads up

 

Hi Carl,

 

Could you stuff a paper towel in the master, have a magnet or vacuum handy, and fine flat file the mating surface?  Going all the way across the master reservoir to keep the file flat… Maybe it’s a little rough?  Final finishing costs money so I wouldn’t be surprised…

I know filings aren’t desired in the reservoir ; maybe there’s a way to keep them out. I have had to do this on rocker cover mating surfaces (heads) to stop stubborn leaks…

D&K

 

Sent from my iPhone



On Jul 1, 2024, at 19:14, Carl Bilter <cbilter@xxxxxxxxx> wrote:

 I hesitate to write a post that sounds like whining, but I think it is a valid heads up and a statement about the current availability/quality of master cylinders for 56-61 300s (and other Mopars).  

 

After much searching, and much to my delight, I found a listing on ebay that offered a "made in USA" brand new master cylinder for the above mentioned cars: 

 

Turns out that the seller is Andy Bernbaum, with whom historically I have had good experiences.  

 

So I ordered the part, and when it arrived, much to my disappointment, the part did not match the photo in the listing, as it does not say "made in USA" on the boot or anywhere else on the part.

No manufacturer box or instruction sheet was included either indicating country of origin.   The part was absolutely IDENTICAL to the Chinese made master cylinder that I had recently bouight at O'Reilly Auto Parts for $10 less!  It will fit of course, but will be no better quality than the part I already have.  So I am returning the part.  

 

The problem I'm having with the new Chinese made master cytlinders (all of them) is that they leak from the cap!  No matter how tight, or how full or not the reservior is with fluid (I'm using DOT5 silicone), the cap/gasket will not seal well.  I do not have this issue with my older American made masters cylinders or even the Chinese master cylinders from a few years ago.  The casting looks ok as does the gasket material.  I chalk it up to poor quality.  I may try doubling up the gasket?  Running out of ideas.  The cap bolt is also metric spec now (10mm hex head) - all of them - rather than the familiar 7/16" that was used even just a few years ago.  And yes, I bench bled the master per instructions, and actually, the Raybestos master (Chinese) says to not bench bleed or you will destroy the piston seal; so you bleed on the car (and waste fluid). 

 

The plug in the bottom port will tend to leak some as well, despite using thread sealer, but that's not a new issue and some of the older American made units will do that as well. 

 

Other than leaking, the Chinese made masters seem to function well.  

 

Anyone else having this issue?  Solutions?  

 

Carl B

 

 

 

 

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