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Brake pedal ratio
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dels56
Posted 2022-08-25 6:18 PM (#623796)
Subject: Brake pedal ratio


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Has anyone measured the brake pedal ratio on a 56 Dodge Custom Royal Lancer manual Brakes.? I think all trim levels should be the same. I did not measure when I had everything apart. Now it is a little difficult to measure. What I get Is 5 : 1

Del S
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57chizler
Posted 2022-08-29 1:20 PM (#623895 - in reply to #623796)
Subject: RE: Brake pedal ratio



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6-1 is a common manual brake ratio, '57 and later are 8-1...never measured a '56.
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Powerflite
Posted 2022-08-29 3:24 PM (#623897 - in reply to #623796)
Subject: Re: Brake pedal ratio



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I just realized that I pulled the manual pedal assembly out of my '56 Belvedere that I could measure. I also recently purchased a '55 power brake setup and have a '56 power pedal as well. So here are the results:

Pedal arm length from pivot to pad mount: 12 1/8" (all '55-'56 are the same length, regardless)
Manual brake pivot to pushrod length: 1 5/8"
'56 Power brake pivot to pushrod length: 2 3/4"
'55 Power brake pivot to intermediate arm: 1 5/8", Intermediate arm to 2nd pivot: 1 1/4" (currently hard to measure), 2nd pivot to pushrod: 4 5/8"


Therefore the pedal ratios are:
'55-'56 Manual brakes: 7.46:1
'56 Power brakes: 4.4:1
'55 Power brakes: 2.02:1 Dismal!

Note that '56 cars with manual transmissions also used the '55 power brake setup.

Edited by Powerflite 2022-08-29 3:37 PM
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dels56
Posted 2022-08-30 12:35 AM (#623918 - in reply to #623796)
Subject: Re: Brake pedal ratio


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Thanks for doing the measuring. I am designing a rear disc brake conversion and need to determine the master cylinder size.

Del
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