HYDRO-VAC brakes. Who knows about these?

[Joe Chasse]

That is one bad ass 1 ton utility bed truck! WAHOO!

Y'know...I guess what I REALLY have here is a HYDRO-BOOST system as vs. HYDRO-VAC. Looks like the original matching pump is gone, so I will go ahead and order a rebuilt one if I can narrow down exactly what I need for my setup. Should come in at under a hundred bux with reservoir.

Hoping to get my rear crossmember in tomorrow evening and get those bolt holes marked, then pull the whole works to drill, and shove it all back in.

There's PLENTY to do without that pump for now, as the front end was cobbled together when I first converted to disk brakes, and now with new steering I will have fun fitting all back together in THAT department.



Fortunately the front sheet metal came off fairly easy in one piece and is waiting outside on a trailer with a tarp over it.

Thanks again for all the photos, diagrams, descriptions. I will be coming back here when I get the rest of the parts.

Thanks to my pal WOOGEROO from over at Chevytalk for turning me on to you guys!

Joe

[Captainfab]

Ummm make that post #69........

Originally Posted by duallyjams

page 3 post 65 has a hydro boost diagram

[mcmlxix]

Well I measured a late model (2004 GMC) Hydroboost and a 1994 Astro Van. The two bolts that are used to mount the MC are the same but the inner diameter where the master cylinder meets the booster is different... The 2004 GMC is 1.8" and the 1994 Astro was about 1.6" (I didnt take a pic and I cant remember exactly, but is was smaller) ...



And the 1994 Astro Van (GMC Safari actually) hydro-boost

[Joe Chasse]

You guys are all inspiring me to pay attention and start taking pictures of the truck projects.