RE: {Chrysler 300} Rear brake proportioning valve

["Dan Plotkin" <dplotkin@xxxxxxxxxxxxxxxxxxx>]

If you go to Rock Auto and select various master cylinders they often include the bore size, which as we all know is critical here. 

-----Original Message-----
From: James Douglas [mailto:jdd@xxxxxxxxxx] 
Sent: Monday, May 13, 2024 9:54 AM
To: Dan Plotkin <dplotkin@xxxxxxxxxxxxxxxxxxx>; 'John Grady' <jkg@xxxxxxxxxxxxxxxxx>; Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Cc: 'Zach Hietsch' <zhietsch@xxxxxxxxx>
Subject: RE: {Chrysler 300} Rear brake proportioning valve

Thanks Danny,

I happen to have a new late 1960's drum-drum in the box. I guess I could just use that or go get a 1970 disc-drum unit.

I was looking around and some of the disc-drum units had a larger bore then than stock 1964 unit. I think it best to keep it close to the stock 1.0 inch if I can.

James

-----Original Message-----
From: Dan Plotkin <dplotkin@xxxxxxxxxxxxxxxxxxx> 
Sent: Monday, May 13, 2024 06:48
To: James Douglas <jdd@xxxxxxxxxx>; 'John Grady' <jkg@xxxxxxxxxxxxxxxxx>
Cc: 'Zach Hietsch' <zhietsch@xxxxxxxxx>
Subject: RE: {Chrysler 300} Rear brake proportioning valve

If it’s a master intended to be used with drums it will have residuals in both ports. If for disk/drums it will have a residual in the rear wheel port. You must remove the residual from any port you will connect to disk brakes and retain the one used with drums. The residual valves are easy to remove. 
On my 61 Plymouth disk/drum setup I used the flattop Mopar dual circuit drum/drum master with front residual removed. On the 300 F I used a 1970 Imperial disk/drum master to clear the right carb and with its body cut down to clear the booster. 

Danny Plotkin

-----Original Message-----
From: 'James Douglas' via Chrysler 300 Club International [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] 
Sent: Monday, May 13, 2024 9:39 AM
To: Dan Plotkin <dplotkin@xxxxxxxxxxxxxxxxxxx>; 'John Grady' <jkg@xxxxxxxxxxxxxxxxx>
Cc: 'Zach Hietsch' <zhietsch@xxxxxxxxx>; 'Chrysler300' <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: RE: {Chrysler 300} Rear brake proportioning valve

I am in the middle of prepping an AAJ kit for the 300K. I wonder if the late 1960's Master Cylinder that I will use, a dual, has a residual valve for the rear circuit or not? I have not purchased it yet.

I will have to look into that.

James

-----Original Message-----
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of Dan Plotkin
Sent: Monday, May 13, 2024 06:01
To: 'John Grady' <jkg@xxxxxxxxxxxxxxxxx>; James Douglas <jdd@xxxxxxxxxx>
Cc: 'Zach Hietsch' <zhietsch@xxxxxxxxx>; 'Chrysler300' <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: RE: {Chrysler 300} Rear brake proportioning valve

I read somewhere more than once that Chrysler didn't use proportioning devices on its disk brake equipped fuselage cars because the engineers thought the weight and the wheelbase made it unnecessary. I have a disk brake conversion on my F, and while I used a residual valve I did not use a proportioning valve. I can lock the rears up first, so I should probably re-think that.

Danny Plotkin

-----Original Message-----
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of John Grady
Sent: Sunday, May 12, 2024 2:16 PM
To: James Douglas <jdd@xxxxxxxxxx>
Cc: Zach Hietsch <zhietsch@xxxxxxxxx>; Chrysler300 <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Rear brake proportioning valve

that is really excellent ; more to it than i ever understood . needs a drawing ( i told them that) but a lot of  mysterious stuff and misinformation removed from my understanding of it . 
Thank you James 
Sent from my iPhone

> On May 12, 2024, at 1:20 PM, 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:
> 
> Zach,
> 
> Suggest you rear the following:
> 
> https://shop.wilwood.com/blogs/news/how-does-a-proportioning-valve-work
> 
> James
> 
> -----Original Message-----
> From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of Zach Hietsch
> Sent: Sunday, May 12, 2024 10:05
> To: Chrysler300 <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
> Subject: {Chrysler 300} Rear brake proportioning valve
> 
> Hello All,
> 
> I am finishing up the brake lines for my conversion to front disks. My kit from AAJ brakes came with a prop valve for the rears.
> 
> Should I install it and if I do what is the correct procedure for setting it.
> 
> I have found a lot of different ways to do it and I am unsure on which one I should follow.
> 
> Thanks
> Zach Hietsch
> 
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