Can anyone help ID this front master cylinder?

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vespam5

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Hey guys, had a front brake master cylinder o-ring fail and when I took it apart I discovered that the master is probably not standard. Does anyone recognize these internals? They look custom....thanks!

Dorian
Los Angeles
 

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Looks very custom and a one off, is the master cylinder sleeved, more like its been bored out to remove corrosion pitting inside the body and the custom plunger made to suit.
 
vespam5 said:
Hey guys, had a front brake master cylinder o-ring fail and when I took it apart I discovered that the master is probably not standard. Does anyone recognize these internals? They look custom....thanks!

Dorian
Los Angeles
Click to expand...
Could it be the RGM one? I fitted one of those on my 850 many years ago and it's still on there but I can't remember what it looks like inside!
 
Larry,

I sure looks like that Old Britts unit with a stainless "D" washer and aluminum "follower". The Master body is also engraved with a serial number like the Old Britts site shows.........

The strange part is that my piston is 16mm......not 13mm. I will take a couple of better photos and post them shortly.
 
Here is what I have:

I had to "field strip" it since it happened in the middle of a long ride but once I saw I had a couple of busted o-rings I had to rear brake the bike home, that was weeks ago and now I can't quite figure out how it goes back together yet haha. The problem I think I might have is that the cartridge is 16mm, I think it was meant to be 13.......weird one.

I purchased my bike with these parts on it by the way..... hence I have no history on the "upgrade". I will probably inquire with Old Britts.


Can anyone help ID this front master cylinder?
 
vespam5 said:
The problem I think I might have is that the cartridge is 16mm, I think it was meant to be 13.......weird one.
Click to expand...

It's the sleeve I/D (and piston O/D) that's 13mm, not the O/D of the sleeve which I think is what you are measuring as 16mm because the original piston/bore is 5/8".

vespam5 said:
I will probably inquire with Old Britts.
Click to expand...

As I mentioned previously Old Britts has closed down.
 
What is the best source for a complete replacement master? Mine is the mirror boss type.
 
vespam5 said:
What is the best source for a complete replacement master? Mine is the mirror boss type.
Click to expand...
Andover Norton can supply a complete 13mm master cylinder. Personally I would go for one of those now. Sleeving was ok when there was no alternative.

Not sure what bike you have, but for the MkII :

andover-norton.co.uk

Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts

Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.
andover-norton.co.uk

And the MkIII :

andover-norton.co.uk

Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts

Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.
andover-norton.co.uk
 
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