Technical Remote mounted hydro-vac units

Can you expand on the reasons for single vs dual?

 

A single circuit master cylinder has one chamber and one outlet. A dual circuit master cylinder will have two chambers and two outlets. All cars manufactured after 67' are required to have the dual set up that separates usually the front and rear brakes so if you have a failure in the brakes and loose fluid in half of the system you will still have some brakes. Also running disc/drum set up it is best to have those separated because of the different rates of brake force generated by each set up.

All that to say depending on which type of master cylinder you are running as to which booster you need. The dual unit is basically two single units back to back with a common atmospheric inlet.

 

So, you are saying that the 5 1/2 dual is for disc/drum and 7 is for disc/disc? I am certainly aware of the value of dual circuit mc's.

 

No, the dual set up is for dual masters and the single set up is for single masters. The 7" size is better suited for a 3/4-1 ton truck that will be carrying a load, the 5-1/2" size will be what is needed for most cars no matter if it is disc/drum, drum/drum, or disc/disc.

 

I am confused. Master Power Brakes has the 7" inch on their site [for a good deal more money than you] but they refer to it as dual diaphragm, not dual circuit. They do not indicate having a single circuit unit. Not trying to cast doubt on your info, just confused. Can you clarify? Do they just not know the product?

 

That is the same part as I will be selling. Dual diaphragm and dual circuit are interchangeable in this instance but technically they don't have diaphragms like most boosters do. Instead they have a piston that seals against the side of the chamber with a rod that pushes on the auxiliary master cylinder on the unit. The single circuit one showed up directly below the dual when I typed in "remote booster" on the master power web site. The cost difference is that I am not trying to gouge my customer's but still make some profit.
Jim Ford
Highway 101 Rod and Custom

 

Here is a diagram showing how the system would be plumbed. The vacuum pump can also just be manifold vacuum if you have at least 16" of vacuum. This is a single circuit diagram and a dual circuit design uses the same principle but would be for a modern master cylinder with two outlets.

 

I am still trying to gauge interest in this product before I make the investment. Please vote.

 

Thanks for voting. It looks like there is 5 interested in these, that is enough to make it worthwhile ordering them. I have a friend who will be the dealer for them and he will give them to me at cost. I will be ordering at least 5 of the 5-1/2" dual circuit units and 5 of the 5-1/2" single circuit. His plan is to order 5 each of the single and dual 7" boosters because his focus is on Dodge Power Wagons and M37's.

He is also developing master cylinder kits and disc brakes for the same vehicles. I am developing master cylinder kits and disc brake kits that fit with stock wheels for Willys pickups and wagons. Along with those kits I am working on more HAMB friendly disc brake kits for wide five front hubs. Later on for the 40-48 hubs that will also fit with stock drum brake wheels. These are designed for the hot rodder who wants to be able to drive a traditional styled car but have some improvements in the safety factor.

I already sell wide five adapters that are similar to the **** Spadaro units that are no longer available. Mine have a slight improvement in that the studs are nearly flush on the back side for brake drum clearance. I also sell adapter covers (see avatar) that look like stock hubs. I am a hot rodder like you guys who holds down a full time job and am trying to make a go of my own business at the same time. I thank the HAMB and everyone on it for the support I have had while doing this.
Jim Ford
Highway 101 Rod and Custom

 

We are doing the order in the next two weeks. There was a 2 month lead time and 15 days shipping last time we checked. I will update this if it is different. I will PM those that voted to see which one you would want.
Jim Ford

 

Is anyone else interested in these?

 

need one?

 

So what is status?

 

Waiting to hear back from the supplier to confirm price and lead time.

 

Great, thanks.

 

Heard back from the supplier today. Lead time is 8 weeks, and their shipping quote was too high so Steve is working on that. I will update when I know more.

 

I voted "yes" but in truth, a) I don't need this right now, and b) there's a company up in Johannesburg I've dealt with before, who bring in Iruna products from Spain and can probably land one of these cheaper. Not knocking this project by any means: just saying - but my situation isn't typical.

However, what brings me to this is that I've been thinking, which I know some of you consider to bode ill.

These things work by a 9-10psi pressure differential between the air valve and the vacuum source, but that needn't be represented by manifold vacuum v. atmospheric pressure. There might be a case to be made where you're already running air for airbags to supply, say, 25psi from an air regulator to the air valve and venting the vacuum connection to atmosphere. Advantages I can think of: constant, instant ***ist due to the 100psi behind the regulator; easy reticulation because chances are that the brake booster will live closer to the air tank than to the engine; adjustable ***ist because air regulators are generally adjustable; and the obvious fix for low/no vacuum due to a big cam and/or forced induction. Something to look at?

 

So you are thinking that you could vent the vacuum side to the atmosphere and use air pressure on the other side that is normally the atmospheric vent? I would have to look at that a bit closer to see if it would work.

 

You'd have a killer product if you get it to work with 12ish" vacuum.

 

Any new info on availability?

 

I don't know why but my thread on this subject got pulled, so I thought I would piggyback on Jim's old thread. I have contacted Jim about these new style hydrovac units that have a dual circuit so it can be used for separate front and rear brakes. These are made by Iruna Ltd. in Spain. I found several auto aftermarket auto parts places in the UK that will ship them here. The best one is creative engineering that makes parts for '49 - '67 VW microbusses. I am interested in getting one for my Studebaker pickup project but found if we order 2 or 3 can get a break on the shipping (not sure on the duty yet). Would anyone be interested in going in on these? The priece before shipping is approximately $385. You can read more at: https://creative-engineering.com/product/indirect-servo-kit/

I read reviews on another UK site and they were all very positive.

Dan

 

I put one of those from the junk yard ( a '55 Cadillac as I recall) on my Willys in the late 60s. I rebuilt it (kits were available back then). Still on there.

My brake system consists of '67 Torino front disk brakes adapted to the stock '36 Willys spindles, Buick finned rear brakes adapted to '56 Olds rear end. '68 GTX dual manual master cylinder with the Hydrovac in only the front, disk brake circuit. I did this because without it the rear brakes would lock up before the front disks engaged which made for some very exciting stops!! With the Hydrovac, the fronts contribute most of the normal braking which they should.

 

X38 that is a single circuit.

 

Hi, did you ever go into production. I'm interested in the 5" dual version for a '32

 

I had two cars with this setup for power brakes. A 54 Chrysler New Yorker and a 57 Thunderbird. Both were stock and both had very good power ***ist.

 

I saw a similar system on a Nash, where the master cylinder was in the stock location and the booster under the floor, there was a 2nd master cylinder involved as well, I never understood it but it worked real good, a ***** to bleed, but it did work good.

 

....They were some quirky automobiles.