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.
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.
From: Chrysler300@xxxxxxxxxxxxxxx <Chrysler300@xxxxxxxxxxxxxxx> on behalf of Andy Mikonis r41hp@xxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx>
Sent: February 18, 2016 5:11 PM
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)
In a swiftly warming Chicago
On Feb 17, 2016, at 1:18 PM, 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:
Posted by: <dverity@xxxxxxxxxxx>
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