Re: [Chrysler300] Disc Brake Conversion for 300G
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Re: [Chrysler300] Disc Brake Conversion for 300G
- From: dan300f@xxxxxxx
- Date: Wed, 13 Oct 2010 20:31:04 EDT
Hi all:
In regards to the email that J.D. wrote, here is an excerpt from a web site
I found that perhaps clears up this thing abut the proportioning valve.
It probably explains it better than I can. By the way, no matter how I
try, with my F, I cannot lock up my brakes but it comes to a stop in a mighty
big hurry. Seems to me I am getting more use of the friction between the
tires and the road than I would if the brakes were locked up and I am
skidding out of control headed for who knows what. So guess which scenario I
desire.
****************************************************************************
********
Proportioning Valve
The proportioning valve reduces the pressure to the rear brakes.
Regardless of what type of brakes a car has, the rear brakes require less force than
the front brakes.
The amount of brake force that can be applied to a wheel without locking it
depends on the amount of weight on the wheel. More weight means more brake
force can be applied. If you have ever slammed on your brakes, you know
that an abrupt stop makes your car lean forward. The front gets lower and the
back gets higher. This is because a lot of weight is transferred to the
front of the car when you stop. Also, most cars have more weight over the
front wheels to start with because that is where the engine is located.
If equal braking force were applied at all four wheels during a stop, the
rear wheels would lock up before the front wheels. The proportioning valve
only lets a certain portion of the pressure through to the rear wheels so
that the front wheels apply more braking force. If the proportioning valve
were set to 70 percent and the brake pressure were 1,000 pounds per square
inch (psi) for the front brakes, the rear brakes would get 700 psi.
****************************************************************************
***********************
So, without a proportioning valve all brakes receive the same amount of
braking pressure thus assuring that the rear brakes will lock up first and
probably causing one to drive using the rear view mirror, backwards, that is.
By the way, an old rule in racing is that if you need more brakes,
install a smaller master cylinder ... but that's a whole new topic which I do not
want to get into.
So there you have it, I don't know what else I can say. I sleep well at
night knowing I have the correct equipment on my car to stop it and protect
my investment.
Dan Reitz
Northridge, CA
300F
1966 300 Convertible
1956 Dodge Custom Royal
1886 Benz
In a message dated 10/13/2010 10:05:15 A.M. Pacific Daylight Time,
retromobilia@xxxxxxxxxxx writes:
Dan,
In regards to the Prop-valve; You said the rears contact first and then
the fronts? Is this not reversed, as in hard braking the rears will lock up
as they are getting pressure proportionally to the front, in higher
percentage....?!
J D Jung
Retromobilia.net
----- 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@xxxxxxxx (mailto: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@xxxxxxxxxxxx (mailto:rpjasin@xxxxxxxxxxx) >
To: _Chrysler300@xxxxxxxxxxxxxxxx (mailto: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@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx)
[mailto:_Chrysler300@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx) ]
On
ehalf Of Mark Souders
ent: Tuesday, October 12, 2010 7:32 AM
o: _tc440@xxxxxxxxxxxx (mailto:tc440@xxxxxxxxxxx) ;
_Chrysler300@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx)
c: _BEhrmann@xxxxxxxxxxxxxx (mailto: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@xxxxxxxxxxxx (mailto:tc440@xxxxxxxxxxx)
<mailto:tc440%40verizon.net> >
o: _Chrysler300@xxxxxxxxxxxxxxxx (mailto:Chrysler300@xxxxxxxxxxxxxxx)
<mailto:Chrysler300%40yahoogroups.com>
c: Bruce Ehrmann <_BEhrmann@xxxxxxxxxxxxxx (mailto: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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