Which Master Cylinder(s)

[oldgrey58]

Hi,

I have two different styles of tin pot master cylinders (same part numbers) and am wondering which is right for a late 59 FC?

I also have tin pots with different hole sizes in the base, is this something that just varied from manufacturers?

Thanks

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[Errol62]

Well they both look period correct to me. The EH had skinny tins, then they went to plastic by HR. The different body to reservoir thread sizes appear on Holden branded oem masters and I’ve had  after market plastic reservoirs to suit both threads. I’ll see if my Master Parts Catalogue sheds any light, but I do recall discussing this previously. RDS will no doubt shed some light.


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[Errol62]

All I can glean is that for the cylinder assembly, FE to EK have the same part number, then EJ to HR have same part number, all tin reservoir. Plastic reservoir suitable body is also listed for EJ to HR.

Unfortunately the casting number your photo shows is not listed, only the complete assembly. However the EJ to HR drum brake body is listed 7226556. Here is one from my collection:



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[Errol62]

Delving a bit further, I found a body 7423384 which appears as body FE to EK. It has the smaller thread.Slightly larger thread shown on top for comparison. There doesn’t appear to be much in it.


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[Errol62]

I have a 7409631 same as the top one in your photo also, which has the smaller thread.


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[Errol62]

If you need any of these bits you are welcome. I’ve got a tin top master too but the tin is pretty rusty. Also several plastic reservoirs, all of the larger thread size.
These appear to be after market items ABS (Adelaide Brake Service).

Good luck making sense of all this. It’s got my old noggin spinning.😵‍💫


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[ardiesse]

7426656 suits the plastic reservoir, and will have wider flange webbing than 7409631 (Clay, please verify).  There would have been a wide-flange but small-thread master cylinder to suit EJ-early HD, which 7426656 superseded.

7423384 will probably have the narrower webbing, and will have superseded 7409631 for FE-EK.

This is my best guess anyway . . .

Rob

[Errol62]

7426556 EJ HR suit plastic reservoir. It fits the larger thread, however I have had the plastic ones in both thread sizes, after market.


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