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9 inch or 11 inch booster? does it really matter?

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9 inch or 11 inch booster? does it really matter?

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Old April 17th, 2018, 10:31 AM
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9 inch or 11 inch booster? does it really matter?

I ordered a Right Stuff disc brake conversion kit (front only) for my Vista Cruiser. I got it today and it has a 9 inch booster, I was expecting an 11 inch. My fault, I didn't double check it when I ordered it. Will it matter with a totally stock 330 engine? I would think it would make enough vacuum. Any opinions?
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Old April 17th, 2018, 12:37 PM
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Single or double diaphragm 9"?
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Old April 17th, 2018, 01:53 PM
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Originally Posted by oldcutlass View Post
Single or double diaphragm 9"?
Single as far as I know. Another option is to just use the 11" booster that is on the car with the drum brakes.
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Old April 17th, 2018, 02:27 PM
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I'd go with the 11", but check the actuator of the booster to master cylinder to make sure they are compatible.
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Old April 17th, 2018, 02:54 PM
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No

Originally Posted by Toocool View Post
Single as far as I know. Another option is to just use the 11" booster that is on the car with the drum brakes.

Get the right stuff on the phone
buy a few more things

No mix drum / disc old / repro parts brake system
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Old April 17th, 2018, 05:35 PM
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A single 9" will give you a third less power assist versus the 11".

You will definitely notice that difference.
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Old April 17th, 2018, 05:37 PM
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Note that the 64-66 cars came with a 9" booster from the factory. GM went to the stronger 11" booster when disc brakes became available in 1967.
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