US spec dual circuit master cylinder pipe fittings

[whitestu]

Does anyone know what the pipe fitting sizes are in the early dual circuit non servo MC? The part number is GMC235. Looks like both outlets are very big but the rear one has an adapter in to make it smaller. It's the same as this one https://rimmerbros.com/Item--i-GMC235

I checked the smaller outlet with the adapter and 3/8unf fits it. The bigger threaded hole is I think 5/8" - guessing UNF, but I can't seem to find a 5/8" to 3/8" unf adapter anywhere.

Did the US spec MGBs of this age use 3/8" brake pipe for the front brakes?

Thanks, Stu

[whitestu]

Having explored further looks like the adapter just isn't available to buy new so only option is a second hand one, which I'm unlikely to find or to make one, which might be feasible. Maybe not worth the effort though.

[Not_Anumber]

Check to see if you could use a late UK/ european spec twin circuit master cylinder as they are plentiful

[whitestu]

Check to see if you could use a late UK/ european spec twin circuit master cylinder as they are plentiful

Thanks - that's what I've already got but I'm not overly happy with the brake pedal travel so slowly trying different components. I got hold of an adapter so will try the US MC at some point.

Cheers