59 replies to this topic

[Kockum]

I also have a 1974 Big Nut with 'N'. The 1968 big nut that is on a 68 Monaro is interesting because it does not specify Disc or Drum. It is on a Disc brake car which has the bail wire tag stamped Disc.





D.

[Kockum]

HQSS , the monaro big nut does not have a cast date on the underside of the cylinder body like LJ--HQ type do . It has HOLDEN and what appears to be a 7 digit part /cast number only . I will try to post that number later today . I have also seen cast iron HK --LC and LJ type master cylinders that have the long snout without the big nut . I must say that these style cylinders look very strange indeed .Perhaps DR .TERRY may be able to shed some light on this topic . D .

[Kockum]

The cast/part no. on the bottom of the 1968 Monaro big nut is 7433138.

Scottya! your big nut 10J4N / 22H4 could be very desirable for someone with a L34, SLR5000 or HQ Monaro wanting to put it back to a matching numbers car.

Just for interest, here is a photo of a cast iron cylinder which has a long snout instead of a big nut. This example was on a HK Monaro on display at the Monaro Nationals in Bathurst.



D.

[Dr Terry]

The cast iron brake master cylinder without the big nut could be one of two types.

1. Early in the HK series GM-H must have had problems with producing enough brake master cylinders to keep up with car production. They imported a number of Delco-Moraine master cylinders from the U.S. to supplement supply, which were of similar design to the 'big-nut' variety but had the snout pictured above. They were that similar, they even used the same rebuild kit.

2. There were various other companies in those days (not just PBR), which supplied aftermarket Holden brake master cylinders & one or two of those also look similar to the one pictured above. The brand names ABS & Quinton Hazell come to mind.

Dr Terry

[Kockum]

DR TERRY , thanks for the information . I have just checked out a stash of cast iron master cylinders and there was one HK / LC long snout cylinder . This cylinder has no identification numbers /letters anywhere on it . D

[FLY_AGAIN_XU-1]

Firstly, did,nt the square top master cylinder first originate late 1971 early 1972 ??? Should,nt a HK be fitted with a round top master cylinder Part Number 7433138 ??? To my knowledge the ones with the long snouts and no nut were fitted to cars with factory and or dealer fitted air conditioning ??? Question :




Can you NUT it out ?




^^^^ 23H8 (23-8-1968) HK (Note no A or P)



^^^^ DISC 9E9 (9-5-1969) HK (Note no A or P)



^^^^ DISC 5J9 (5-9-1969) HT (Note no A or P)



^^^^
ADR 4 : Seat Belts
ADR 5A : Anchorages for seat belts and child restraints
ADR 7 : Hydraulic brake hoses








^^^^ THE KEY


Who supplied Hydraulic brake hoses to Holden in the early 1970,s ???


Can you NUT it out ???


B.

[Kockum]

IMHO the 327 Monaro I photographed at Bathurst probably has the wrong style cylinder on it. It should be like this one which has the HK - G and LC rounded-off chambers and lid.







D.

[FLY_AGAIN_XU-1]

^^^^^^^^ These were mainly found on top of the line Brougham,s and later the early Statesman,s (That had air conditioning ???)


Any one nutted it out yet ???

[FLY_AGAIN_XU-1]

2. There were various other companies in those days (not just PBR), which supplied aftermarket Holden brake master cylinders & one or two of those also look similar to the one pictured above. The brand names ABS & Quinton Hazell come to mind.

Dr Terry
[/quote]




^^^^^^^ A CLUE

[meanmachine72]

no nuttin idea man......

[FLY_AGAIN_XU-1]

Come on guys !!!!!!!

The answer is there in front of ya,s !!!!!!

When did the bignuts first get A and P stamped into them ???????




ADR 7 became effective from Janurary 1970


How any more clues do ya,s want ??????












^^^ When did you become a emoticon Johnno ? lol

[FLY_AGAIN_XU-1]

2. There were various other companies in those days (not just PBR), which supplied aftermarket Holden brake master cylinders & one or two of those also look similar to the one pictured above. The brand names ABS & Quinton Hazell come to mind.

Dr Terry

[Collo]

'A' is for ABS, 'P' is for PBR and other letters represent the respective manufacturer?

[Kockum]

Are you saying that the A = ABS and P = PBR?
Do you know what company is represented by N?

If this turns out to be correct, given that the nuts are removable, a more "permanent" identifying mark of the manufacturer would have been a mark cast in the cylinder itself.

Here is another question I have wondered about. One is stamped Holden, the other Delco.









Perhaps Dr Terry can advise when the change in the lid stamping took place.

D.

[Bazza]

'A' is for ABS, 'P' is for PBR and other letters represent the respective manufacturer?

Hi

According to the ABS website - they didn't commence business until 1981.

Cheers

Bazza

[meanmachine72]

^^^ When did you become a emoticon Johnno ? lol
[/quote]


hahahahaha.....point taken bruce!!! i guess now is when i became that emoticon
promise to be sporting a 12 pack by toranafest!!!!lol

[FLY_AGAIN_XU-1]

Are you saying that the A = ABS and P = PBR?

Do you know what company is represented by N?

D.

If i was a betting man (Which im not) my money would be on Nasco (Replacement) AC Delco supplied parts to both Holden and Nasco did,nt they ???


Certainly makes sence that P = PBR though according to Bazza,s research it appears that ABS did,nt commence business until 1981 ???


I think we may need some valueable input from Dr Terry or Dattoman to complete this one...........................

[FLY_AGAIN_XU-1]

The answer we seek may well be on the actual brake hoses themselves........
The original ones i have here are all marked PBR and believe it or not are also dated


Has anyone got some original brake hoses from 1970,s cars HT, HG, HQ, HJ, HX, or LC, LJ, LH, LX that are not PBR ones ??? And of coarse must be original fittment........


Could A = A C Delco (Just a guess)

Edited by FLY_AGAIN_XU-1, 14 March 2009 - 09:24 AM.

[FLY_AGAIN_XU-1]

[Collo]

I'll have a look at my hoses in a min. I'm out strippin it it now, just came in for a beer and a quick look on here.