The Yamaha brake was fitted as a safety upgrade to many British bikes in-period.
Fast forward forty years and fitting one now is hardly the same as fitting modern twin discs or purchasing a modern motorcycle. It's in the spirit of what owners did at the time.
Eric I'm not sure what you're suggesting. Use a single leading shoe Norton brake ? Use a modern replica brake in preference to an original period brake simply because it's made in Japan ?
Something else ?
To clarify - the bike is for road use only.
I'm suggesting that to my eyes Japanese parts will always ruins the "spirit" of these old British machines. I was too young at the time to ride a motorcycle but I've seen period photos of road going specials fitted with various TLS from British manufacturers or Italian brakes like the big Fontana 250 but never Yamaha ones. A single leading shoe Norton brake will never look as out of place as these Yamaha brakes. I'm pretty sure you already know that Norton and Triumph used to make good TLS brakes but there is also John Tickle, Robinson or even Dresda if you like big ones.
And yes, I'd definitely fit a nice Robinson replica for example against any Japanese.
I'm sure no one can imagine a Jap engined Brough Superior with a Mikuni carb, a Kawasaki clutch and a Yamaha brake for "safety upgrades", why our poor Vincents would have to endure this?
Please note that I'm the builder and owner of a Norvin, a triple engined Triton and that I'm currently persuading a Comet engine into a BSA A10 frame. Not a Japanese part on any of them and they all go and stop very well, thank you very much.
But in the end, it's your machine and of course you can do what you like with it.