Technical Remote mounted hydro-vac units

I am looking at buying some of these remote mounted hydro-vac units to be use with the master cylinder kits I will be offering soon. I wanted to test the waters here on the HAMB to see if there is any interest in these units. They are brand new not rebuilt. They are available in 5-1/2" and 7" as a single or dual circuit design depending on you master cylinder. They operate off of vacuum like a modern booster does but can be mounted almost anywhere. This allows you to retain your under floor brake set up and boost it without having a booster hanging below the frame to get damaged by a speed bump or the like.

I am looking to see if there is any interest as the minimum order for these is 5 units in each size. please feel free to ask any questions about this and post what you think of it. Thanks for your responses.

 

What would you expect to sell a dual circuit for?

 

$439.95 for a dual 5-1/2"
$299.95 for a single 5-1/2"
$489.95 for a dual 7"
$394.95 for a single 7"
These prices are tentative and will be finalized before an order is placed for them.

 

I will bump this for the morning group to vote and comment on. All input is welcome.

 

There appears to be two different dual units.

Could you explain the difference?

 

The one that looks like two back to back is the 7" one and the one with the brown background is the 5-1/2" model. Because of its size they were able to make the two pistons in the same chamber

 

Ahh. They all look good. Just need dimensions.

 

I think I have access to all the dimensions. I will work on getting that all posted tonight.

 

Here are the dimensions for each of the remote boosters. They are under each respective picture.


1) overall length 13"
2) length of center 4.80"
3) length of end 4.09"
4) diameter of body 5.50"
5) centerline to side of plumbing 4.13"


1) overall length 8.54"
2) body length 3.54"
3) end length 5"
4) body diameter 5.50"
5) centerline to side of plumbing 4.13"


1) overall length 15.11"
2) body length 9.84"
3) end length 5.27"
4) body diameter 7"
5) centerline to side of plumbing 4.48"


1) overall length 10.15"
2) body length 4.76"
3) end length 5.39"
4) body diameter 7"
5) center line to edge if plumbing 4.13"

 

Smaller than I thought!

 

The 5-1/2" dual circuit could fit inside the frame rail on 32 and newer Ford frame rails. There are many other options as to where it can be located.

 

Thought these type of units run off of power steering unit. Give info on how they work.

Sent from my VS985 4G using Tapatalk

 

Rather than go into a lengthy discussion on the operation of the hydro-vac unit I will let this vintage military training video on the operation do the explaining with animation to show the inner workings.
http://www.bing.com/videos/search?q...&mid=03AC88F7010A6273EB5703AC88F7010A6273EB57

 

The video is for large trucks but the operation of the smaller units is the same. The hydro-vac differs from the hydro-boost that uses power steering hydraulic pressure to boost the system. The hydro-vac unit is more in line with traditional cars than the later hydro-boost systems.

 

What's the new news here? Remote vacuum boosters have been around for at least 70 years. They were OEM on many pickups, medium trucks and cars up through the early 1960s. Bendix Hydrovac was one widely used brand name and hydrovac was used as a generic nomenclature as well.

jack vines

 

That is right they have been around for years but they fell out of favor when the integrated fire wall mounted ones came into play. The last ones you could get were the Midland units and they no longer make them. The main advantage is the ability to mount it most anywhere and that some are dual circuit allowing you the added safety of that type of system. The main thing is that they are now available again.

 

Good point. The OEM systems were all single master cylinder. That these offer dual circuit is the new news.

Any info on country of origin?

When you get it sorted out, PM me and I'll post it in the various Studebaker fora for you. There is a ready market there for the single and probably the dual system.

jack vines

 

Thanks Jack. They are made in Europe and are not just some Asian style knock off. The company bought the rights to make these and they are of high quality. If they were not a good quality part I would not sell them because my reputation depends on it.
Jim Ford
Highway 101 Rod and Custom

 

You're thinking Hydroboost. These are Hydrovac. Vac as in vacuum, just like a firewall mounted one.

Slightly different in exact function, but same results.

 

What criteria do you use for sizing the unit (5.5 or 7")? Have you installed one yet? Can the sensitivity be adjusted?
Thanks, mike

 

I worked with the remote boosters for years in the truck repair bidness. They were every bit as effective and reliable as the firewall mount units but easier to service. The main problems we encountered was seized bleeder screws and rusting/corrosion but were using them on salt trucks and they were generally mounted below or behind a running board where they were subject to salt spray from the front tires of the truck..
All in all, a very good product IMHO.

 

The 5-1/2" units are sized to fit most cars and 1/2-3/4 ton trucks. If you are hauling heavy loads or have a 1 ton truck then I would recommend the 7" units. A friend had a Dodge 1 ton that was a bit touchy on the brakes so he installed a valve in the vacuum line to shut it off when running empty.

 

What is minimum vacuum needed?

 

16"is the minimum, but 18" is better for a minimum so you are not having the possibility of inconsistent braking.

 

I would be a customer for a 5 1/2 " unit.

 

Cool, single or dual?

 

do they need to be mounted horizontally? thx

 

Mostly, they can have some angle but you have to be able to get the air out of the bleeders.

 

How about getting one to work in the 12" range?

 

You would need a vacuum pump to achieve the needed level of at least 16"