leon
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Model: FE
Posts: 436
My FC Business Sedan
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« on: November 07, 2016, 04:05:41 PM » |
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Hi, can anyone tell me is a VH/44JA brake booster unit suitable for an all drum FC holden.
Any technical advice would be appreciated.
Regards.
Leon
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mcl1959
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« Reply #1 on: November 17, 2016, 11:48:00 AM » |
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Leon, generally VH44 boosters are for all drum brake cars, the extra letters define exactly what car it was for, since some cars had bigger drums than others requiring a bit more boost.
I don't have access to a booster book anymore so you would probably have to go to a brake shop to find out exactly what the booster came off.
Holdens, Falcons and Valiants were all pretty much the same in the drum brake era so it would be unlikely that the booster would not be suitable at all.
VH 40 boosters fit the disc drum cars.
Ken
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ehsv6
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Model: other Holden
Posts: 57
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« Reply #2 on: November 17, 2016, 02:54:14 PM » |
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My bible when it comes to Holden brakes, boosters are mentioned as they where introduced or optional on respective models. http://www.hoppers.com.au/stoppin%20holden.htmCheers Keith |
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hsv-001
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« Reply #3 on: November 18, 2016, 08:01:15 AM » |
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My Mums old HG wagon had a 44 . Boosted all 4 drums . They worked ok under normal conditions but if one wheel goes down for any reason you still got boost on the others and that can be interesting .
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Errol62
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« Reply #4 on: November 18, 2016, 08:06:11 AM » |
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Mm... HGs have dual circuit brakes. Can't see how that could work Haydn.
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mcl1959
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« Reply #5 on: November 26, 2016, 04:03:02 PM » |
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I went down to Hoppers Stoppers and had a look at a Booster catalogue.
The typical output pressure for a VH40 is around 1300 to 1400 psi.
The following are output pressures for VH44 boosters
VH44 - 820 psi
VH44B - 950 psi
VH44D - 780 psi
VH44F - 950 psi
VH44J - 1270 psi
VH44P - 820 psi
That would indicate that a 44J would be getting towards too strong for an FC
Interestingly a couple of VH 40's would be suitable for the FC with 4 wheel drums
VH40D and VH40F both have an output pressure of 840 psi
Ken
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FCRB26
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« Reply #6 on: November 26, 2016, 06:59:18 PM » |
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Just out of intrest ken whats a VH24 put out in comparison ?
I have a NOS one it was in a little crate with straw when i got it that came with a job lot but never fitted it to anything as i didnt know if they made much difference .
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mcl1959
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« Reply #7 on: November 26, 2016, 07:58:22 PM » |
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Unfortunately the VH24 was not in the catalogue.
I had one fitted to the 3 door van, however, and I can say it is similar to the low value VH44 figures
It certainly did make a difference and looked good as well.
Ken
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mcl1959
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« Reply #8 on: November 26, 2016, 08:02:54 PM » |
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This one is not mine by the way, it's from accessory of the week  Ken |
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hsv-001
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« Reply #9 on: November 27, 2016, 06:24:20 AM » |
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My question ,and pardon me if I am ignorant but wouldn't the output pressure[potential pressure] of a booster depend on the vacuum and the strength of the diaphragm . Just wondering because many years ago I had a fail in a vh40 and successfully repaired a diaphragm with a vulcanising patch .
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Dr_Terry
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« Reply #10 on: November 27, 2016, 08:15:21 AM » |
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My question ,and pardon me if I am ignorant but wouldn't the output pressure[potential pressure] of a booster depend on the vacuum and the strength of the diaphragm . Just wondering because many years ago I had a fail in a vh40 and successfully repaired a diaphragm with a vulcanising patch .
Not quite. The main difference between those boosters is the cylinder bore. They all use the same size diaphragm. The available vacuum from a petrol engine cant be any higher than 19-inches at idle & high 20s during deceleration, so the maximum force applied by the diaphragm can't be altered. Basically the smaller the bore the higher the pressure. So from that table the VH44/VH44P had the largest bore cylinder, while the VH44J had the smallest. Mods to the booster can alter the rate of application, but the max pressure is limited by the size of the diaphragm versus the size of the bore. Dr Terry |
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mcl1959
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« Reply #11 on: November 27, 2016, 04:21:52 PM » |
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I can confirm what Dr Terry says
The VH44 and VH44P have a 3/4 inch bore whilst the VH44J has a 5/8 inch bore from the catalogue.
Ken
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hsv-001
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« Reply #12 on: November 28, 2016, 07:51:31 AM » |
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So ,my next question is ,are we going to get 19 inches from our old sideplate or do we need a non return valve on the line as some little nissans do ?
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Dr_Terry
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« Reply #13 on: November 28, 2016, 08:01:49 AM » |
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So ,my next question is ,are we going to get 19 inches from our old sideplate or do we need a non return valve on the line as some little nissans do ?
All vacuum brake boosters have a check valve somewhere in the system,. Most PBRs have it where the vac hose attaches to the booster. It is part of this fitting. Unless you put in a lumpy can you will have plenty of vacuum. Even then you will get heaps of vacuum on deceleration, the one-way check valve then stores it for the next brake application.. Dr Terry |
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leon
Senior Member
Offline
Model: FE
Posts: 436
My FC Business Sedan
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« Reply #14 on: January 24, 2017, 12:13:01 PM » |
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I'm getting back to all those most helpful considerations on this topic and to let you all know I decided to go with the VH/44J on my FC Standard bussiness sedan, It performs like a treat.
The booster was purchased from Burt brothers of Fairfield in N.S.W. who told me this booster would be suitable for my car.
regards.
Leon
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