Hydroboost??? - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

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post #1 of 27 (permalink) Old Aug 4th, 19, 10:10 PM Thread Starter
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David Estes
 
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Hydroboost???

Does anyone have the measurements of the spring that goes between the hydroboost unit and the master cylinder? I made an output rod and have order 2 springs and they are too big to fit in the unit. I measured where the spring goes and I think a 1.25" dia. and 2.75" length. is what would fit in mine.
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post #2 of 27 (permalink) Old Aug 4th, 19, 11:40 PM
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Re: Hydroboost???

Mine doesn't have a spring in it. Pulled the unit from an 03 C30, modified the mount plate and pedal rod to fit in my 72 Chevelle.
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post #3 of 27 (permalink) Old Aug 5th, 19, 12:01 AM
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Re: Hydroboost???

The factory GM unit I used didn't have a spring either. It was complete with the master cylinder when I got it.

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post #4 of 27 (permalink) Old Aug 5th, 19, 7:38 AM Thread Starter
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Re: Hydroboost???

Ok guys thanks. Thatís been my biggest holdup 👍👍
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post #5 of 27 (permalink) Old Aug 5th, 19, 8:12 AM
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Re: Hydroboost???

Just to add, I'm using a junkyard hydroboost out of an 03 Tahoe in my 64, no spring, no issues.

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post #6 of 27 (permalink) Old Aug 5th, 19, 11:33 AM Thread Starter
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David Estes
 
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Re: Hydroboost???

Can someone photos of your setup including hose routing?
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Thanks in advance
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post #7 of 27 (permalink) Old Aug 5th, 19, 12:23 PM
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Re: Hydroboost???

I'd used the firewall bracket from the tahoe, pressed out the studs, filled the holes, then drilled 4 new holes for the chevelle setup (and welded in a mount for my clutch setup). I also had to enlarge the hole in the firewall for the neck of the hydroboost to pass through. Email sent.
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post #8 of 27 (permalink) Old Aug 5th, 19, 10:24 PM
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Jason
 
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I used a comp cams valve check spring for a LS motor (4758-1) it was a perfect fit. Custom built output rod.
I used the CPP firewall bracket. Routing goes from pump to hydroboost inlet. Then hydroboost outlet to steering gear inlet. I used 2 return lines didn’t want to tee them.
So from steering gear outlet to reservoir.
Hydroboost return line to reservoir.
I used AN fittings. Bulk head style for the extra return line just drilled a hole and tightened it down.
Also used Gm 2771004 Hydro-boost for the star retainer clip.
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Last edited by Jasons 69 Chevelle; Aug 5th, 19 at 10:52 PM.
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post #9 of 27 (permalink) Old Aug 5th, 19, 10:38 PM
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post #10 of 27 (permalink) Old Sep 12th, 19, 9:45 PM
 
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Quote:
Originally Posted by Jasons 69 Chevelle View Post
I used a comp cams valve check spring for a LS motor (4758-1) it was a perfect fit. Custom built output rod.
I used the CPP firewall bracket. Routing goes from pump to hydroboost inlet. Then hydroboost outlet to steering gear inlet. I used 2 return lines didn’t want to tee them.
So from steering gear outlet to reservoir.
Hydroboost return line to reservoir.
I used AN fittings. Bulk head style for the extra return line just drilled a hole and tightened it down.
Also used Gm 2771004 Hydro-boost for the star retainer clip.
Did you buy the CPP firewall bracket individually or as a kit? I've been looking for a bracket and have come up empty so far. Any help is appreciated.
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post #11 of 27 (permalink) Old Sep 12th, 19, 11:18 PM
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Re: Hydroboost???

No bracket is needed, just modify the stock hydroboost bracket. It is simple to do and free.
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post #12 of 27 (permalink) Old Sep 12th, 19, 11:58 PM
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Re: Hydroboost???

Philip, you should do a write-up on your fitment and plumbing of your unit and make it a sticky on this Forum!!

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post #13 of 27 (permalink) Old Sep 13th, 19, 11:07 PM
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It’s $69 from CPP you will have to call them they sell it individually but I don’t have the part number handy.
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post #14 of 27 (permalink) Old Sep 17th, 19, 11:35 PM
 
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Re: Hydroboost???

Quote:
Originally Posted by Jasons 69 Chevelle View Post
Itís $69 from CPP you will have to call them they sell it individually but I donít have the part number handy.
Is the only mounting option upside-down?
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post #15 of 27 (permalink) Old Sep 18th, 19, 6:19 PM
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Re: Hydroboost???

If you orient the Hydra-Boost unit so the pressure canister is on the engine side - you can use stock pressure hoses for a mid 80's Olds Delta 88 diesel application. These hoses are a perfect fit and cost less than $30.00 each at auto parts outlets anywhere. I like stock parts availability whenever possible in case of a failure.
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