Master cylinder thread.

Includes handbrake, cylinders, shoes, discs, rims and rubber.

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oz_ek
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Master cylinder thread.

Post by oz_ek »

Gents,
Does anyone know the thread pitch of a PBR clutch & brake master cylinder reservoir ?

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oz_ek
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Re: Master cylinder thread.

Post by oz_ek »

I'm guessing this reservoir to master cylinder seal is NLA?
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Errol62
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Re: Master cylinder thread.

Post by Errol62 »

Reckon I got one in a kit recently. Also the rod grommet seal thing. Anyway it is just an o ring Phil. Don't know the thread size sorry. There was an earlier ABS one which was different but the PBR are later type. There appears to have been a change in size when they changed between the original tin types. One was a tall skinny tin and the other shorter and wider.

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Blacky
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Re: Master cylinder thread.

Post by Blacky »

Tall skinny tin was EH , short fatter tins for our girls.
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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Dr Terry
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Re: Master cylinder thread.

Post by Dr Terry »

Sorry I don't know the thread pitch, but I can confirm that there are 2 different threads for both types of master cylinders (factory, PBR & other aftermarket types).

The early tin type (FE to early HD) had a rounded thread form which was smaller in diameter to the later cylinders. ABS & other companies did produce a plastic version of this smaller thread type. You occasionally see these at swap meets.

The later (plastic) reservoirs had a larger diameter, squarer ACME type thread as in your 1st photo.

Holden introduced the plastic reservoirs in June 1965 when disc brakes first became available in mid-HD. They needed a larger volume to cater for the piston travel of the front calipers.

To replace the rubber seal (pictured) I use a standard BS O-ring, BS215 for the smaller reservoir & BS217 for the larger one.

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Re: Master cylinder thread.

Post by Dr Terry »

Double post !!
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Errol62
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Re: Master cylinder thread.

Post by Errol62 »

As always great info Dr Terry

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