Re: [Chrysler300] Disc Brake Conversion for 300G

[retromobilia@xxxxxxxxxxx]

Hi all, 
I used to race classic cars in Mexico and experimented (on skid pad) with proportioning valves. I am writing this, because I would hate to see a lot of our beautiful and rare cars damaged. PROPORTIONING VALVES ARE AN ACCIDENT WAITING TO HAPPEN! In almost every instance the valve in various adjustment positions would allow the rears to lock up first. This would not be evident until you have a panic stop in which case the rear WILL pass up the front. (if you doubt what I am saying take the car to an empty shopping center parking lot and test the panic stop)(while at it try braking in a moderate turning circle a little harder than you would normally) I feel certain you will remove the Prop-valve post haste! 


A far better solution is to do the math and sleeve the master cylinders two pistons so the the hydraulic ratio is is suitable to the brakes used. (or get a matched original brake system which was engineered with the drums or disks in consideration) 


Follow up would be very appreciated. Especially on the math thing! 


Good luck, 
John 


----- Original Message ----- 
From: dan300f@xxxxxxx 
To: MRS954@xxxxxxx, rpjasin@xxxxxxxxxxx, Chrysler300@xxxxxxxxxxxxxxx 
Sent: Tuesday, October 12, 2010 9:04:08 PM 
Subject: Re: [Chrysler300] Disc Brake Conversion for 300G 






Hi all again: 

I too wondered why I should have a proportioning valve on my '66 300. 
What woke me up was back about 20 years ago on my way to a 300 Club meet north 
of Seattle, I was crossing the bridge over the Columbia River in Portland. 
I was cruising along when all of a sudden I had no brakes but the 
emergency brake. I put it to good use and quickly got off the freeway at the next 
exit. Problem was that I had made an adjustment to the push rod in Grants 
Pass and it caused the fluid to back up into the master, taking fluid out 
of the lines to the brakes. 

You can fast forward with this story with a scenario where one of the brake 
lines fails for some reason. The result will be the same ... no brakes. 
If you have ever tried to put the binders on with an open cylinder, your 
foot will hit the floor. 

But, with a proportioning valve and a dual master cylinder, you have 2 
separate circuits. One for the front wheels and one for the rears. With a 
proportioning valve, the rears contact first and then are followed by the 
fronts which do the majority of work to stop the vehicle. This helps to keep 
the car from swapping ends. Unless you have a major catastrophy wherein 
the master is wiped out, you have either the fronts to stop with or the 
rears. So, your odds of stopping and avoiding a collision are doubled. 

I am very happy I put a dual master cylinder and a proportioning valve on 
my '66 300 vert. and my F. 

Dan Reitz 
Northridge, CA 


In a message dated 10/12/2010 7:39:58 P.M. Pacific Daylight Time, 
MRS954@xxxxxxx writes: 

Bob, 
No, I didn't install a proportioning valve, other than the stock block. 
But I do know that I can lock up all 4 wheels (Bambi made me do it). I didn't 
see a need for a valve. All my former brake issues have been solved since 
I installed the AAJ set. 
After about 3 or 4 slow-downs or stops, the original brakes faded 
severely. After driving for some time, when I hit the hooks to stop for a traffic 
signal or stop sign, the car would veer off to one side or the other, never 
consistent. Each time I hit the brakes it was a new and exciting adventure. 
It got to the point where I hated to drive it, and I was ready to sell it. 
I took the car to my favorite shop where they turned the drums (again) and 
trued up the shoes to match the drums. Everything was new, from the master 
cylinder to the wheel cylinders, including hoses, stainless lines, 
everything. After the conversion, the car is fun to drive again. 

Mark 

-----Original Message----- 
From: Bob Jasinski < rpjasin@xxxxxxxxxxx > 
To: Chrysler300@xxxxxxxxxxxxxxx 
Sent: Tue, Oct 12, 2010 12:11 pm 
Subject: RE: [Chrysler300] Disc Brake Conversion for 300G 

Mark, 

Did you install a proportioning valve, and if so what type and where did 
you 
nstall it? If you didn't, have you checked to see if your rear wheels and 
ront wheels lock up at the same time? AAJ suggests stopping on a gravel 
oad and adjusting the proportioning valve until the wheels lock up the 
ame. Dan Reitz writes that the '66 300 with disc brakes had a single pot 
aster and no proportioning valve from the factory, so are they really 
eeded? 

Bob J 

From: Chrysler300@xxxxxxxxxxxxxxx [mailto: Chrysler300@xxxxxxxxxxxxxxx ] On 
ehalf Of Mark Souders 
ent: Tuesday, October 12, 2010 7:32 AM 
o: tc440@xxxxxxxxxxx ; Chrysler300@xxxxxxxxxxxxxxx 
c: BEhrmann@xxxxxxxxxxxxx 
ubject: Re: [Chrysler300] Disc Brake Conversion for 300G 

ick, 
used the basic kit from AAJ Brakes. After a few years of fighting brake 
ade and not knowing if or how my 300H would stop, I converted to front 
iscs. I did not change the master cylinder, I wanted to have the engine bay 
ook original. I did the conversion about 6 years ago, and I have no 
egrets. My brakes work fine now with no sudden surprises when applying the 
rakes. The AAJ basic kit comes with detailed instructions and a list of 
tems that must be purchased locally. AAJ does supply a complete kit but the 
reight charge to ship it across the country was more that a few tanks of 
as to drive to my local NAPA store. I lost a little sleep knowing the 
alipers were for a 76 Monte Carlo, but after my first drive with the new 
etup, I slept like a baby. 
Good luck with your project. 
Regards, 
ark Souders 
00H 
ohrsville, PA 
-----Original Message----- 
rom: Rick Ehrmann < tc440@xxxxxxxxxxx <mailto:tc440%40verizon.net> > 
o: Chrysler300@xxxxxxxxxxxxxxx <mailto:Chrysler300%40yahoogroups.com> 
c: Bruce Ehrmann < BEhrmann@xxxxxxxxxxxxx <mailto:BEhrmann%40stribling.com> 

ent: Mon, Oct 11, 2010 10:21 pm 
ubject: [Chrysler300] Disc Brake Conversion for 300G 
Hello friends - After a few years of sitting in a garage, my brother 
Bruce's 

s been revived. She's running fine, but after much brake work over the 
ears, 
've decided to convert to front disc brakes and a dual master cylinder. I 
now 
me of you have already done this conversion. What has your experience been? 
hat parts or conversion kit did you use? Thanks for any insight on this you 
an 
fer. 
ick Ehrmann 
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