RE: [Chrysler300] 1955 Power Brake Booster and Master Cylinder
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RE: [Chrysler300] 1955 Power Brake Booster and Master Cylinder



Jack -
 
Thanks for the explanation on how these master cylinders work. That would
explain why the fluid leaked out.
 
The kit that Harmon sells is the one for the Kelsey-Hayes power unit. I just
spoke to them a few minutes ago. Their complete kit is for both the p/b unit
and the master. Here's the link to their kit:
https://www.parts123.com/parts123/yb.dll?parta~partsort~1~cadfffkz~~20
 
Ron

  _____  

From: Jack Boyle [mailto:jackcboyle@xxxxxxxxx] 
Sent: Tuesday, June 12, 2018 9:29 AM
To: 'Ron Waters'
Subject: RE: [Chrysler300] 1955 Power Brake Booster and Master Cylinder



My late father was an expert on these and rebuilt one that I have in my
stash.

 

Usually when somebody has a '55 rebuild kit is not for the Kelsey-Hayes unit
but for a traditional piston unit that was dealer installed on many cars.
The KH unit uses a rod going through donut seals to displace fluid rather
than a piston pushing a column of fluid. If, when you separated this unit's
components, the stainless steel rod came out of the donut seals that would
let the fluid out.

 

I have struggled with my '55 brakes for years trying to get them up to
modern/freeway needs. So I replace the KH unit with a safer double cylinder
unit.

 

I think the guy in Minnesota (he advertises everywhere) is the only source
for kits for this unit.

 

I do have an NOS kit but the rubber is so old..

 

..Jack

 

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of 'Ron Waters' ronbo97@xxxxxxxxxxx [Chrysler300]
Sent: Tuesday, June 12, 2018 7:56 AM
To: Chrysler300@xxxxxxxxxxxxxxx
Subject: [Chrysler300] 1955 Power Brake Booster and Master Cylinder

 

  

Hey Everyone -

 

I have a non-operating 1955 power brake booster. This is a one-year-only
setup that is found on the C300 as well as other Mopars of that year.

 

I removed the assembly from the firewall for repair. When I separated the
master cylinder from the booster, brake fluid poured out of the rear bore of
the master. There was also some brake fluid inside the rear of the booster.
I was told that that was correct due to the design of the setup. I'm
scratching my head on that. Any thoughts on this ?

 

Side Note: The rebuild kit for the power brake unit is available from Harmon
Classic Brakes (https://harmonclassicbrakes.com/). 

 

Ron





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Posted by: "Ron Waters" <ronbo97@xxxxxxxxxxx>
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