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Old 06-26-2013, 08:54 AM   #1
SCOTI
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When did GM switch to Hydroboost?

When did GM start utilizing Hydroboost equipped brakes on gas C20's - C30's?
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Old 06-26-2013, 09:05 AM   #2
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Re: When did GM switch to Hydroboost?

I know there were a few in the late 70's.
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Old 06-26-2013, 09:55 AM   #3
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Re: When did GM switch to Hydroboost?

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Originally Posted by Jonboy View Post
I know there were a few in the late 70's.
Yeah.... Trying to determine when they eliminated vacuum booster disc set-ups on C30's.
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Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....

Cubic inches is like Indiana Jones with a cheap pistol.
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Old 06-26-2013, 07:03 PM   #4
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Re: When did GM switch to Hydroboost?

My 77 GMC has Hydraboost.
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Old 06-26-2013, 07:16 PM   #5
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Re: When did GM switch to Hydroboost?

My '75 C-30 dually has hydro-boost brakes with discs.
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Old 06-26-2013, 11:09 PM   #6
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Re: When did GM switch to Hydroboost?

I know the HB (JB8 brake option) has been available for years. Just wondering when the HD vacuum set-ups (JB7) were discontinued on C30 apps....
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Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....

Cubic inches is like Indiana Jones with a cheap pistol.
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