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

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post #1 of 9 (permalink) Old Aug 4th, 19, 9:10 PM Thread Starter
 
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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 9 (permalink) Old Aug 4th, 19, 10:40 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 9 (permalink) Old Aug 4th, 19, 11:01 PM
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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 9 (permalink) Old Aug 5th, 19, 6:38 AM Thread Starter
 
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Re: Hydroboost???

Ok guys thanks. Thatís been my biggest holdup 👍👍
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post #5 of 9 (permalink) Old Aug 5th, 19, 7:12 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.

*Jeff*

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post #6 of 9 (permalink) Old Aug 5th, 19, 10:33 AM Thread Starter
 
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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 9 (permalink) Old Aug 5th, 19, 11:23 AM
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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 9 (permalink) Old Aug 5th, 19, 9:24 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 9:52 PM.
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post #9 of 9 (permalink) Old Aug 5th, 19, 9:38 PM
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