Re: [Chrysler300] Magnum Force disc brake conversion

300H

On Feb 22, 2016, at 6:59 AM, 'David Schwandt' finsruskw@xxxxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

Brake system doom and gloom is all I hear on the Forward look site as well,
how bad they are and should be pitched and replaced

Same story w/the ball and trunnion U-joints that were used for how many
years on MoPars?

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300]
Sent: Monday, February 22, 2016 8:57 AM
To: dverity@xxxxxxxxxxx; 'Jean-Yves Chouinard'; Chrysler300@xxxxxxxxxxxxxxx;
'Andy Mikonis'
Subject: RE: [Chrysler300] Magnum Force disc brake conversion

With you 100% Don..

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of dverity@xxxxxxxxxxx [Chrysler300]
Sent: Thursday, February 18, 2016 7:38 PM
To: Jean-Yves Chouinard; Chrysler300@xxxxxxxxxxxxxxx; Andy Mikonis
Subject: Re: [Chrysler300] Magnum Force disc brake conversion

I think the 12 inch brakes were a heavy duty option on the Dodge and
Plymouth.

I have never had issues with the original drum brakes that I haven't been
able to fix. Linings separating from the shoes, and stretched springs come
to mind. I always do new master and wheel cylinders, and don't turn the
drums unless they need it. If there are hard spots on the drums, you can't
remove them with a regular brake lathe. An old time shop that used to be in
this area had a grinder attachment that could be used on their lathe to take
care of hard spots. They also arc grinded shoes for many of my cars. I have
my own arc grinding machine now thanks to the late great John H.

I have had issues with disc brake conversions, and dual masters though. The
pedal ends up being way to low for comfort, and the stopping power is not
that much better. The plumbing is a pain too. Chrysler designed them well in
the first place.

Don

From: mailto:Chrysler300-noreply@xxxxxxxxxxxxxxx

Sent: Thursday, February 18, 2016 6:36 PM

To: Chrysler300@xxxxxxxxxxxxxxx ; Andy Mikonis <mailto:r41hp@xxxxxxxxx>

Subject: Re: [Chrysler300] Magnum Force disc brake conversion

Very interesting info Andy, thank you for sharing.

Surprising that a 2100 pound Daimler with disc brakes took 33 feet more to
stop!! Chrysler brakes were not that bad!! Dart a few hundred pounds less
than the G, explains the 125 feet for the Dart, which probably was equipped
with 11 inch brakes ...vs 12 inch for G.

J.Yves

_____

From: Chrysler300@xxxxxxxxxxxxxxx <Chrysler300@xxxxxxxxxxxxxxx> on behalf of
Andy Mikonis r41hp@xxxxxxxxx [Chrysler300]
<Chrysler300-noreply@xxxxxxxxxxxxxxx>
Sent: February 18, 2016 5:11 PM
To: chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] Magnum Force disc brake conversion

Yes, John, I agree. One of my mechanic mentors who opened a service station
in 1957 always told me the problem with these brakes was with the mechanics
and not the engineers.

He always arc ground. (In fact, I have his arc grinder now.) The linings he
ground for me in 1990 are still on my G after 100K+ miles.

Other things I have published in the club newsletter the newbies wouldn't
have seen:

Paul Mallwitz, a Chrysler engineer who spoke at a club meet in 1982 was
asked: "How did you get the brakes to work on these cars?"

Reply: "With great difficulty. Those Center Plane brakes had to be put
together like a watch in order to make them work properly."

Next, in the April 1961 issue Motor Life magazine tested a 300-G and
recorded a 60 to 0 of 131 feet. That's average for today's cars. Mistake?
Don't think so. Dart D-500 in the same issue: 125 feet!

Other cars in the same issue:

Olds Super 88: 159 ft.

Olds F-85: 171 ft.

Daimler SP-250: 194 ft. (2090 lbs. with disc brakes)

Andy

300 editor

In a swiftly warming Chicago

On Feb 17, 2016, at 1:18 PM, 'John Grady' jkg@xxxxxxxxxxxxxxxxx
[Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

Just a FYI<

A lot of the fitment differences for a total upgrade are because they
changed at various times the lower (at least) ball joint OD , how it fits,
(press or screw in to lower arm) and the size of that ball joint taper that
goes into the steering knuckle. I know it was long ago, details not 100%
clear tonight , , but I put 67-68 Dodge police car package steering
knuckles, discs and ball joints into 57 Dodge control arm by reinforcing
the end of lower control arm with added ring of 1/4" steel and then boring
that out for what I think was the larger (than 57) 67-68 lower ball joint. I
think top 57 one fit the knuckle or spindle ok, or found one that fit. .
That let us put on stock 67 or 68 police car disc brakes, the "big discs"--
hot set up long ago --before disc kits--- on 57 Mopar.

Now they have kits that fit the old knuckle.and leave the small ball joints.
Two kinds of kits?? ..special adapter knuckle-- or not . By way of
awareness, not comparing. But insight into why some years and not others.

This change to discs on my 57 was made , really, because I had frankly
screwed up more than one total contact brake setup, through not knowing
what I was doing, after buying all new parts, , and was fed up with "all
the problems". They are real problems. But is it the brakes?

I had a brand new 60 dodge , in 60, manual brakes , bought then because I
liked two leading shoes on the manual, had heard and seen many horror
stories about power brakes in general 55-60, --60 Dart was a great set up! I
beat it unmercifully. It was perfect in every way , brake wise; used to
laugh at best friend's GM 57 Pontiac power brakes with on-off feel. Beating
unmercifully, was street drag racing several nights a week to 100 mph + ,=
going was the problem, not stopping. No pulling no grabbing..

The basic torsion bar suspension design is about the same across these
years ; all this by way of info, not advocating doing it, but good to think
or know about. .

Do you need discs?? Sort of falls out of it? Idiot proof as far as
assembling the pads..

I am in the middle of doing some discs, but still ambivalent. Not if drums
are working right, is one answer. They worked right at the beginning.

Also looking back, many of the problems with total contact , or other
Chrysler brakes are errors caused by experts (who are not) in putting them
together right, especially arcing the new shoes to a turned drum. If you do
not, with all new parts, the brakes do not work. Discs get into front/rear
balance, another possible can of worms, despite that balance "valve" . They
have inherently different actions..

They won all those NASCAR races with them, stories about "fade" on the
street leave me cold. Worse than fade--- -------if the shoes are not
touching the drum , most of the way around!

Sure , not as good as modern discs, but awfully good brakes.

Did you know GM put MOPAR total contact brakes on the racing Corvettes with
Buick drums about 1960?? they watched the 300B race, brakes and all, and
win . . So would I. On a light corvette? Bulletproof . And the "fading after
3 panic stops from 120+ mph" in contemporary 300 tests is not exactly how
we use our cars today. What reminded me of all that , was seeing that 300B
race clip a few weeks back , on this site . No disc conversions , yet racing
competitively for real, in 2015? Braking hard on corners over and over...
(he did have Buick drums too..which have aluminum fins on them. 60 to maybe
62. That forces a wheel change too ). Before discs, that was the hot setup.
Rods, Bonneville etc . The brakes we take off.

My problems with these brakes on 300F over the years was not fade..they were
pulling, grabbing, low pedal , poor stopping rate, squealing etc etc . 300
B or 60 Dart was not like that .. Why?

Just sayin..there is a disconnect here somewhere. Others see it?

John

From: <mailto:Chrysler300@xxxxxxxxxxxxxxx> Chrysler300@xxxxxxxxxxxxxxx [
<mailto:Chrysler300@xxxxxxxxxxxxxxx> mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of 'Bob Jasinski' <mailto:rpjasin@xxxxxxxxxxx> rpjasin@xxxxxxxxxxx
[Chrysler300]
Sent: Wednesday, February 17, 2016 4:46 PM
To: 'John Nowosacki'
Cc: 'Chrysler 300 List'
Subject: RE: [Chrysler300] Magnum Force disc brake conversion

I sent them an email. I'll report back with what they send me.

Bob J

From: John Nowosacki [ <mailto:jsnowosacki@xxxxxxxxx>
mailto:jsnowosacki@xxxxxxxxx]
Sent: Wednesday, February 17, 2016 1:22 PM
To: Bob Jasinski
Cc: Chrysler 300 List
Subject: Re: [Chrysler300] Magnum Force disc brake conversion

pictures say 57 to 61, but when I click on the link for picture or part
number, it says 65 to 72?

On Wed, Feb 17, 2016 at 3:42 PM, 'Bob Jasinski'
<mailto:rpjasin@xxxxxxxxxxx> rpjasin@xxxxxxxxxxx [Chrysler300] <
<mailto:Chrysler300-noreply@xxxxxxxxxxxxxxx>
Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

Has anyone looked into or installed the disc brake conversion kit offered
by Magnum Force?

<https://www.magnumforce.com/magnumforce_disc_brakes.htm>
https://www.magnumforce.com/magnumforce_disc_brakes.htm

They offer several kits and appear to be fairly new offerings.

Bob J

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