Welcome to the world of Morgan ownership!
Couple of points from working on a various 1970's (and later 4/4's)
Front calipers are standard Girling Type 14 and whilst new pattern ones are available quality is a bit suspect! Probably best if you have your originals reconditioned. Classicar Automotive (Cheshire) or Contract Auto Engineering in Stourport can help here.
As fitted, the Girling tandem master cylinder is NLA though some new old stock ones do turn up at a huge (250 quid plus) price tag. Academic as will need a rebuild anyway from sitting on a shelf! Replacement is from a later model or better still have your existing one fitted with a stainless sleeve and rebuild. Again, Classicar and Contract Auto Engineering can help here.
There is a circuit splitter/shuttle valve which is aimed at isolating the brake circuts in case of a fluid loss. Only problem is I've never come across one that has actually worked!
Give some thought to the brake lines - I think the original steel ones will be past their best by now. I use Kunifer to make new ones but you could use copper at a push.
I use stainless steel braided hose for the flexible pipes. Last set of rubber hoses I fitted in 2023 were actually date marked 2015 and had been sitting in a Lucas Girling box on a shelf slowly deteriorating.
Rear brake set up is based on the Austin A60. Wheel cylinders are A60/Sunbeam Alpine. Ditto brake shoes, springs and adjusters
Refitting the wheel cylinder is a bit of a pain the arse but the trick is to lubricate the back plate and the wheel cylinder. Also fit the middle of the three securing clips last.
Brake adjusters seize at the drop of a hat, so strip clean and reassemble with copper slip
As TBM says, I have parts numbers but most of my parts books are packed due to a house move
Arwyn
