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Title: VH/44JA brake booster Post by: leon on November 07, 2016, 04:05:41 PM 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 Title: Re: VH/44JA brake booster Post by: mcl1959 on November 17, 2016, 11:48:00 AM 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 Title: Re: VH/44JA brake booster Post by: ehsv6 on November 17, 2016, 02:54:14 PM 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.htm Cheers Keith Title: Re: VH/44JA brake booster Post by: hsv-001 on November 18, 2016, 08:01:15 AM 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 .
Title: Re: VH/44JA brake booster Post by: Errol62 on November 18, 2016, 08:06:11 AM Mm... HGs have dual circuit brakes. Can't see how that could work Haydn.
Sent from my iPhone using Tapatalk Title: Re: VH/44JA brake booster Post by: mcl1959 on November 26, 2016, 04:03:02 PM 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 Title: Re: VH/44JA brake booster Post by: FCRB26 on November 26, 2016, 06:59:18 PM 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 . Title: Re: VH/44JA brake booster Post by: mcl1959 on November 26, 2016, 07:58:22 PM 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 Title: Re: VH/44JA brake booster Post by: mcl1959 on November 26, 2016, 08:02:54 PM This one is not mine by the way, it's from accessory of the week
(https://s16.postimg.org/4hdy3hlvl/image.jpg) ($2) Ken Title: Re: VH/44JA brake booster Post by: hsv-001 on November 27, 2016, 06:24:20 AM 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 .
Title: Re: VH/44JA brake booster Post by: Dr_Terry on November 27, 2016, 08:15:21 AM 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 Title: Re: VH/44JA brake booster Post by: mcl1959 on November 27, 2016, 04:21:52 PM 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 Title: Re: VH/44JA brake booster Post by: hsv-001 on November 28, 2016, 07:51:31 AM 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 ?
Title: Re: VH/44JA brake booster Post by: Dr_Terry on November 28, 2016, 08:01:49 AM 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 Title: Re: VH/44JA brake booster Post by: leon on January 24, 2017, 12:13:01 PM 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 |