SOHC.co.uk Forums > CB350/400

"Correct" master cylinder cap?

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Mikep328:
Having managed to get the front brake working well thanks to advice here, my original concern that I might need to install a Brembo or other replacement master cylinder  to get good brakes is no longer relevant.

My goal with this bike is to have it as original-looking as possible.  For example, I recently purchased new shocks that match the originals, replacing the Hagons that were on the bike.  The Hagons worked perfectly well but were not all-chrome as were the originals.

SO...I'm trying to determine what was the correct master cylinder cap for a 1976 UK CB400.  I haven't been able to find a definitive period ad/brochure, etc to clarify that.  Below are the two examples (from DS).  Can anyone tell me which cap would have been on a new, UK 1976 model?  I have seen a German ad from '76 and it has the "WARNING" cap but I can't find anything to definitely show if the UK model had that or the other cap. 

I can't find a reference to "J1703" brake fluid earlier than 2001 which would indicate that that cap would not have been on a 1976 motorcycle but I want to verify that.

TrickyMicky:
It's the lower photo, the one showing just the type of brake fluid.

Mikep328:
Thanks!  I had never heard of JS1703 until buying this bike!  :)  Interesting that the German 1976 CB400 shows what appears to be the warning/DOT 3 cap.

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