HYDRO-VAC brakes. Who knows about these? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bubba327 · 04-08-2011, 05:44 PM

So if the hydro vac pumps have two return ports, one for the return from the hydro vac and one returning from the power steering gearbox , And you wish to add a remote cooler, which line would you plumb it in??
The stock cooler went after the PS gearbox in the return line to the pump.
If the return line was tee'd ...I would put it after the Tee so all fluid could be cooled. If two separate returns are used only half of the returning fluid would be cooled.
Any ideas?? Or is this even a problem?? Which would get hotter?

duallyjams · 04-08-2011, 06:15 PM

The cooler goes in the return line from the gear box .

mcmlxix · 05-10-2011, 02:39 AM

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

04-08-2011, 05:44 PM	#1
bubba327 HOW long until spring?? Join Date: Mar 2009 Location: Star Idaho Posts: 1,413	Re: HYDRO-VAC brakes. Who knows about these? So if the hydro vac pumps have two return ports, one for the return from the hydro vac and one returning from the power steering gearbox , And you wish to add a remote cooler, which line would you plumb it in?? The stock cooler went after the PS gearbox in the return line to the pump. If the return line was tee'd ...I would put it after the Tee so all fluid could be cooled. If two separate returns are used only half of the returning fluid would be cooled. Any ideas?? Or is this even a problem?? Which would get hotter? __________________ 69 chevelle convertible 71-C-10 short-wide and low 64 C-10 custom shortbox "Bubba"s Recycling project"

04-08-2011, 06:15 PM	#2
duallyjams Registered User Join Date: May 2007 Location: Deale Md Posts: 4,663	Re: HYDRO-VAC brakes. Who knows about these? The cooler goes in the return line from the gear box . __________________ James 63 GMC V6 4speed carryall 65 chevy swb bbw V8 auto 68 K20 327/4 speed, buddy buckets 2002 GMC CC Dually Duramax 64 GMC lwb 3/4 V6 4speed SOLD 66 GMC swb bbw buddy buckets SOLD IG duallyjams The only thing that stays the same is constant change!

05-10-2011, 02:39 AM	#3
mcmlxix Collector of Projects Join Date: Apr 2003 Location: Las Vegas Posts: 3,106	Re: HYDRO-VAC brakes. Who knows about these? 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 __________________ Rich 1972 K5 Blazer CST Click HERE D60 BIG BRAKE UPGRADE Click HERE Last edited by mcmlxix; 05-10-2011 at 02:40 AM. Reason: added a second pic



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