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Split brake systems.

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K2-K6:
Worth a look https://youtu.be/oVE2pQuMJM0 that shows how a basic tandem cylinder works.

You may have to hit the pedal fast with one circuit open/ compromised to force the emergency capability to function, as in pure panic when you realise the brakes don't work  ;D

Most system bleed through as you've described when carrying out normal bleeding, without having to do anything in the way of adaption. 

You could try stamping on pedal with one port open and piped into a receiver to assess, test functionality.

Lobo:
Thanks Ted / Nige - problem now solved.

About 3 yrs ago I upgraded the brakes from 4x drums to 2x disc + 2 rear drums. This conversion specifically requires a split system M/C; whose 2 outputs are each tailored to the disc & drum circuits.
And I bloody plumbed them the wrong way around. Doh!

So now, with either Front or rear fluid loss, the pedal goes 80% travel before hardening up. Still gonna be heart stopping I guess… as Ted described.

(the split M/C common to both the Beetle and the Split Screen Kombi for this conversion. Except in the Beetle the primary piston is aft, and in the Kombi - forward. So, whilst I can’t particularly remember, I’m guessing I used Beetle write ups for the instal)

K2-K6:
Oops!  Simon  :)

At least you've got to the bottom of it now, hopefully confidence that it's working as intended  for the safety function.

Think most early split mastercylinder were front feed and rear feed discreet system type as already described.

Eighties saw more with four pot calipers front, two piston on one feed and independent, with the other pair in tandem with rear circuit to give front only or four at reduced squeeze on the other circuit.

Austin princess (ADO71)  calipers may have been the first of this orientation and still sought after in competition car circles as they are potent, rigid and fit native inside 14" rims 13" at a push.
Also Mini Metro & MG type vehicle generally used litte four pots which are similarly routinely found on competition cars.

If you wanted a more comprehensive redundancy then something like that may be a consideration  to split the front in same way.

Properly specified and fitted though, there's not often great cause for concern in reliability with decent components though. I use aeroquip for the flexible links if I fit anything in the way of modified system on cars too.

A few round here have had squirrel attack, they go through rubber/fabric type with ease.

Bryanj:
I liked the Rolls idea of a twin system
2 master cylinders and 2 calipers per wheel

Lobo:
Never seen both a Kombi and Rolls Royce referred in the same discussion 😂.

My dad bought a Princess - new. Got it home, the boot lock had fallen out, necessitating a new lock / different key. A month later the suspension mounts unglued themselves - back to the dealer much longer. Maybe this due a vibration - the tyres had flats baked into them. A year later the bronze paint had a green copper hue about it. And there was more.
I hardly ever saw my dad cross; my mum had a Datsun Cherry which just ‘went’ - he obviously laboured this fact to Michael Edwardes in a letter …. which had little use. Red Robby probably got to it first & tore it up.

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