Re: {Chrysler 300} Dual master

I have two 1970 Imperial masters machined to fit under booster (and clear Ram) new in box if anyone is interested.

Folks, I would concentrate on keeping your stock Mopar brakes in tip top shape. Adding parts after the fact has been a waste of time and money for me. My F goes to the shop tomorrow for an UN-disk brake conversion back to stock.

-----Original Message-----
From: "John Grady" <jkg@xxxxxxxxxxxxxxxxx>
Sent: Sunday, August 3, 2025 5:54pm
To: "RICK AND DEBBIE CLAPHAM" <rixpac@xxxxxxx>
Cc: "John Gaynor" <gaynorindustries@xxxxxxxxx>, "Club International Chrysler" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Dual master

i made a new top for the common big chrysler dual , have also used dart but volume stored is on small side if an issue

Anyone ever have a failure on a dual ? I’m not sure Id call it braking , have to pump , pedal almost hits floor . Not all its racked up to be

Why I like the big one

The cover was 1/4 flat aluminum , held on by what looks like a big muffler U bolt goes under master .

cover was machined with two wings sticking out to receive U bolt , think it was 3/16”

You give up the domes. many masters do not have them anyway

Worked ok …

easy to open , relatively

On Aug 3, 2025, at 2:55 PM, RICK AND DEBBIE CLAPHAM <rixpac@xxxxxxx> wrote:

Yes. I used the late 60s early 70s short A body master cylinder 300 F and G. Added proportioning valve from same. Takes a few line adapters. Tubing bending tool is helpful. Always double flair brake lines. Rick

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From: 'John Gaynor' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Sunday, August 3, 2025 11:16:09 AM
To: Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} Dual master

Howdy
Has anyone installed a dual master cylinder without doing a disc brake conversion?

I enjoy the originality of the drum brakes, however having the safety of a dual master would be comforting.

Appreciate your thoughts.

John

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