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03-23-2019, 08:13 PM
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#1 |
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Registered User
Join Date: Apr 2016
Location: saginaw Mi.
Posts: 70
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Brake pedal ratio
Hi, I am assuming the brake pedal is the same in 67-72,
Saying that, does anyone know the ratio on the brake pedal? With the big curve in the pedal I am having a difficult time getting a good measurement to do the division to come up with the right ratio. Hoping one of you have been through this and you already know the ratio. Thank you |
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03-23-2019, 08:46 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,510
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Re: Brake pedal ratio
Manual brakes is 6 to 1.
Power is 4.5 to 1. |
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03-24-2019, 04:18 PM
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#3 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,142
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Re: Brake pedal ratio
Depends on model, brake system (GVW) and power vs manual.
What exactly do you have? K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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03-24-2019, 04:19 PM
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#4 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,142
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Re: Brake pedal ratio
You can also calculate the pedal ratio = pedal travel / master cylinder stroke, if that is easier.
K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 03-24-2019 at 05:29 PM. |
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03-24-2019, 04:24 PM
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#5 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,142
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Re: Brake pedal ratio
Lastly, the curve doesn’t matter, because the pedal swings in an arc and the points follow that trajectory.
Measure from the pivot point to the center of the brake pedal pad in a straight line. Make a second unique measurement from the pivot point to the brake rod attaching pin in a different straight line. Those are your two numbers. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 03-24-2019 at 05:30 PM. |
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03-24-2019, 04:24 PM
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#6 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,142
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Re: Brake pedal ratio
...
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 03-24-2019 at 05:46 PM. |
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03-24-2019, 06:05 PM
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#7 |
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Registered User
Join Date: Apr 2016
Location: saginaw Mi.
Posts: 70
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Re: Brake pedal ratio
The drawing from Keith will help I understand the measuring and the division but the curve was throwing me. I'm using the stock brake pedal with a Wilwood non power master cylinder, C6 Corvette disc brakes all the way around, Wilwood wants to know the pedal ratio so they can give me the right master cylinder with the right bore size thanks for the input from everybody.
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