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Tte531 06-19-2016 10:47 AM

Hydroboost Spacer Needed?
1983 Wagoneer 360

Ok im sorry if this is a repeat from somewhere deep in the library of knowledge but I cant find it and i promise ive tried....

I have a 1994 HB unit from an Astro. I have measured the rod length on the VacBooster and the HB unit and both rods are of the same length. Why then is an additional 1" spacer needed? If the rod length was longer then I would understand the spacer but mine appears to be the same from the back of the unit plate to the tip of the rod.

Am i looking at this wrong? Thanks for any help!

77Deepj20 06-19-2016 12:43 PM

Is the purpose of the spacer to adapt the bolt patterns of the different vehicles?

Tte531 06-19-2016 04:09 PM

Ok so that was a bad one on my part... That piston in the HB was just coincidentally at the same position as the one on my Vac Boost. so never mind...

But I have another question... Is there a pin that goes from the Hydoboost to the MC? like there is one that goes from the Vac Booster to the MC.. Or is there a piston in the HB that pushes the MC.


Tte531 06-20-2016 01:10 PM

Ok looks like there should be a rod. THis is the information i dont find when putting together your own unit.

Has anyone made their own HB to MC push rod?

babywag 06-20-2016 03:29 PM

Been a looooong time since I converted, but IIRC I just re-used the stock pushrod? It nothing special just a round metal dowel w/ smoothed ends.
Could easily be made from round bar stock & grinder.

68glad 06-20-2016 05:21 PM

The spacer is needed to accommodate the longer rod of the astro unit that attaches to the brake pedal

serehill 06-20-2016 06:11 PM

Contact this guy Via the mail system on Ebay or look him up on this forum as Elliot. No one knows more about Jeep & Hydroboost than this guy he will have the knowledge & all parts you'll need to get this done. He's a Great guy. 8qU1c4Xg

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