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munriman Offline
#1 Posted : Monday, 12 February 2024 11:29:54 AM(UTC)
munriman

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I am hoping that someone can clear up a question regarding the big nut master cylinder cover. Mine is a type 1 GTS 327 and the early type cover that was on the car reads "Use Delco Brake Fluid" embossed in the lid on both reservoirs.

I have also seen the same early master cylinder cover type that reads "Use Holden Brake Fluid" embossed in the lid on both reservoirs.

I am wondering if the embossing was changed during production or the dozen other possibilities these lids could be different. Essentially the question is what would be the nearest to the bullseye to being correct for Type 1 GTS 327.
HK1837 Offline
#2 Posted : Monday, 12 February 2024 12:28:19 PM(UTC)
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I have no reallclue, but as far as I know all HK with discs should be the same master cylinder at the same time. Which 327 went into a 1837 should have no effect on the cylinder. There may have been different suppliers to GMH too. I also wonder if it’s an original vs Nasco cylinder thing?
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Dr Terry Offline
#3 Posted : Monday, 12 February 2024 1:37:11 PM(UTC)
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The early HK brake m/cyls & parts were sourced from Delco-Moraine in the US until local production came on stream. So early stuff will read 'Delco' & the locally made stuff will read 'Holden'.

Dr Terry
If at first you don't succeed, just call it Version 1.0
munriman Offline
#4 Posted : Monday, 12 February 2024 4:33:07 PM(UTC)
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Thanks Doctor Terry makes perfect sense.
HK1837 Offline
#5 Posted : Monday, 12 February 2024 4:37:51 PM(UTC)
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What do you mean by early HK Terry? Like up to January’68? Or was it much later into ‘68.
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munriman Offline
#6 Posted : Monday, 12 February 2024 8:31:50 PM(UTC)
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My apologies Dr Terry, I know the post below was in 2009 and much has changed since then and our memories fading as well but I thought I would paste it below as a reference an adjunct to this thread.

Sorry I forgot to add this is from the GMH-Torana forum

Posted 23 March 2009 - 07:21 PM

Hi Guys.

This lot is stretching my memory a fair bit, but anyway here's what comes to mind. This info only applies to the 'big' Holdens & most Toranas & not the 4-cyl HB/LC/LJ/TA series or Geminis. Stuff for those cars was sourced from Lockheed, Girling & later Girlock.

AFAIK, all brake & clutch master cylinders as well as drum brake wheel cylinders, from the 48 (FX) up to the late 70s were made in-house by GM-H. The only exception I can think of would be the small number of 'no-nut' early HK units imported from the USA (the Delco-Moraine div. of GM). The first non-GM-H master cylinder to be seen regularly in production, was the PBR alloy type with the large plastic reservoir & which also incorporated the proportioning valve. These units were first seen (on Holdens) on the A9X, then the Commodore & the later (1979) UC Toranas & then finally the WB.

The current company known as ABS, formed in 1981 was a different entity to that which produced aftermarket brake parts in the 50s?, 60s & 70s. The most common-place old ABS item seen these days is the replacement plastic reservoir, with the black plastic lid, seen on FE-HR master cylinders. They also made replacement brake drums for pre-HK Holdens.

That no-nut cast iron cylinder shown in an earlier post is not a GM item. I'm not sure what brand it is, because even ABS had their logo cast into their cylinders.

Someone mentioned 'special' brake master cylinders used on Broughams, Statesmans or cars with factory a/cond. They did make a different version in early HK, to suit the old relay lever type booster. Early on, they attempted to get extra clearance for the Frigidaire compressor, on 307 V8s, by using a banjo & bolt fitting at the front port instead of a normal brake pipe & flare nut. This still caused dramas, so they made a batch of cylinders with the front port left un-drilled & the pipe exiting thru the centre of the big nut. I've occasionally seen these at swap meets, leaving plenty of guys scratching their heads. You should've heard some of the 'expert' theories.

Holden didn't make any disc calipers, they were all made by either Girling, PBR or Girlock.

I'm not sure about if it was 'all' hoses, but PBR certainly did supply a lot a brake hoses to GM-H for production. I'm not sure if any other companies supplied any brake parts for Holden but I can't think of any that would've been big enough to supply GM-H's huge demand in those days.

Dr Terry.

Edited by user Monday, 12 February 2024 8:32:31 PM(UTC)  | Reason: Not specified

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