Alloy master Cylinder cap, MK111?

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Does anyone know if/ where I can source an alloy brake master cylinder cap for the Mk111? Old plastic caps are looking tatty, early disc brake alloy caps don't fit properly.
 
ranmar850,
You should be able to pick up new ones from suppliers. Walridge sold be one but it was for the pre MkIII. I am not sure if the two are compatible?
Regards,
Thomas
CNN
 
The thread form on the earlier alloy cap is different to the later plastic type so don't get an alloy cap unless it states it will definitely fit the later plastic cap type master cylinder or maybe get an alloy one made they are simple part if you have a lather or friendly local machine shop and the thread is not a close fit so its an easy job realy.
 
toppy said:
The thread form on the earlier alloy cap is different to the later plastic type so don't get an alloy cap unless it states it will definitely fit the later plastic cap type master cylinder

Which years are we talking about here for different thread forms ?

I had a plastic cap on an 850Mk2 master cylinder, when the original alloy cap got damaged.
Was a perfect simple swap.
This was back in the 1970s though - when possibly everything was made correctly to fit.
Still have it, if a photo would help anyone...
 
Rohan said:
I had a plastic cap on an 850Mk2 master cylinder, when the original alloy cap got damaged.
Was a perfect simple swap.
This was back in the 1970s though - when possibly everything was made correctly to fit.
Still have it, if a photo would help anyone...

The pre-MkIII and MkIII master cylinder cap threads are not the same.

master-cyl-cap-leak-t6532.html
MkIII (Plastic cap)
Alloy master Cylinder cap, MK111?

Pre-MkIII (Alloy cap)
Alloy master Cylinder cap, MK111?
 
Thanks LAB.

Likewise, I don't recall any problems with the later plastic cap on an earlier master cylinder.
Although this was some years back now.
That was all that was available as spares for a replacement cap back then.

And the opposite to what is being asked here..
 
There were also 2 different styles of plastic cap - Norvil sold some early plastic caps a few years ago, they where asking a mint for them!! I believe the thread size on the plastic caps is the same.
 
So, no further progress on this. This is where you come in , Madass140--there must be so much pent-up demand for alloy Mk111 master cylinder caps--I'll have the first two , thanks :D
 
If the cap is just a bit faded and chalky, not beat up, you can just clean it real good with hot soapy water and spray it semi-gloss black. Will look brand new. :mrgreen:
 
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