Dual circuit master cylinder

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mph
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Re: Dual circuit master cylinder

Post by mph »

Im not sure if they make a pull strut but thats another good idea putting one bolt base on the inner fender . If anyone has a old rusty drivers side hinge they want to donate to me ill bolt it on my fb, buy and try a hand full of different length gas struts from Bunnings drill a million holes relocating the strut until something works .im sure it would be sorted in a hour or so once you have all the bits. all the unused struts can go back no worries.

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Last edited by mph on Mon Jul 26, 2021 8:13 pm, edited 1 time in total.
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Re: Dual circuit master cylinder

Post by funkyscooter »

https://www.gasstrutaustralia.com.au/sp ... on-struts/
These pull instead of push - based on how little the spring moves, not sure if they would work due to minimum travel requirements.
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Re: Dual circuit master cylinder

Post by mph »

funkyscooter wrote:https://www.gasstrutaustralia.com.au/sp ... on-struts/
These pull instead of push - based on how little the spring moves, not sure if they would work due to minimum travel requirements.
Nice find. If someone has the spring open and close length based off where you might cut the hinge side spring hooks off and drill in strut fixings and maybe the spring rate tension ill enquire with the company. Im currently unavailable to measure off my FB.

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Re: Dual circuit master cylinder

Post by Errol62 »

Errol62 wrote:Couple guys I know used XD XE XF dual circuit boosters. No clearance issues to bonnet hinges and work well.


FB ute fixer upper, EK van on rotisserie
Finally spoke to mates about this. Lengthened XE offset pedal mounted centre of pedal box. No clutch, auto. Suppose could run cable clutch if manual. Booster is mounted central between clutch and brake masters. No hinge issue at all. They didn't think it needed to be &*#@. Also talked about Igor's van using Mazda booster.

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Re: Dual circuit master cylinder

Post by mph »

Errol62 wrote:
Errol62 wrote:Couple guys I know used XD XE XF dual circuit boosters. No clearance issues to bonnet hinges and work well.


FB ute fixer upper, EK van on rotisserie
Finally spoke to mates about this. Lengthened XE offset pedal mounted centre of pedal box. No clutch, auto. Suppose could run cable clutch if manual. Booster is mounted central between clutch and brake masters. No hinge issue at all. They didn't think it needed to be &*#@. Also talked about Igor's van using Mazda booster.

FB ute driver, EK van project
I wonder if thats what this set up is made from then .ImageImage

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mph
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Re: Dual circuit master cylinder

Post by mph »

Hi team how would i go about working out what actual size master cylinder i should use for hg front disk and htg rear drums in my fb.

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Errol62
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Re: Dual circuit master cylinder

Post by Errol62 »

Stock KTG is 1” isn’t it?


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Re: Dual circuit master cylinder

Post by mph »

Errol62 wrote:Stock KTG is 1” isn’t it?


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Im uncertain thought someone might know. Would the pedal length or throw make a difference to whats needed

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Re: Dual circuit master cylinder

Post by Blacky »

Errol62 wrote: Tue Aug 03, 2021 9:46 pm Stock KTG is 1” isn’t it?


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yes.
When you're faced with an unpleasant task that you really don't want to do, sometimes you just have to dig deep down inside and somehow find the patience to wait for someone else to do it for you.


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Re: Dual circuit master cylinder

Post by mph »

Is it an improvement changing to a smaller or larger bore than std. Or just stay with what holden intended and engineered it for.

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Errol62
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Re: Dual circuit master cylinder

Post by Errol62 »

Smaller bore will give you softer pedal but more travel comes with this. I would use 1” stock one as it is most likely to work with the other stock Holden bits. The only variable is the pedal ratio. I was looking at a HK pedal box this morning. I should have measured the thing doh.


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Harv
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Re: Dual circuit master cylinder

Post by Harv »

Errol62 wrote: Wed Aug 04, 2021 6:10 pm Smaller bore will give you softer pedal but more travel comes with this.
Yep. Bore size effects how the pedal feels, but less so the overall braking capacity.

Smaller bore = less pedal effort, but more pedal travel.
Larger bore = more pedal effort, but less pedal travel.

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Re: Dual circuit master cylinder

Post by mph »

Just had a thought and looked into it seems eh and hr run the brake pedal in the middle of the under dash bracket , i wonder if one of these modded would suit an fb or ek to get the pedal rod moved over to the left allowing to fit a booster directly to the firewall and miss the oem bonnet hinge.

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Re: Dual circuit master cylinder

Post by Harv »

The pedals on the FB/EK are a simple slip fit on the mounting shaft. They have pretty big bosses on the end. You can dissassemble, grind the bosses down until the pedals move across, then pack the resultant space with water pipe spacers. Worked for me with the wagon.

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Cliff Regan
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Re: Dual circuit master cylinder

Post by Cliff Regan »

Hi,
I have used the clutch mounting area (auto box) and bent the clutch pedal arm around and welded it to the brake arm.
Just another option I guess.
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