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You are correct, the Dolomite range was NEVER fitted with a dual circuit brake system, just a tandem master cylinder on later cars.
I'd argue that! True, the system used is not like the modern diagonal split which is universal today and has been since the early 80s, still it's a dual (dual meaning 2) circuit system, it just has a distinct front circuit and a distinct rear circuit, rather than a diagonal split. But there are still 2 completely separate circuits, each serving 2 of 4 wheels and each capable of functioning alone if the the other fails.
The only hydraulic bit shared is the reservoir.
Though, I will admit that, from experience, the braking effort generated by a dual circuit braked Dolomite if only the rear circuit is working, is marginal at best and the pedal only JUST above the carpet! The saving grace of this is, I would say more than 90% of failures involve rear wheel cylinders so the likeihood of you being left with ONLY the rear circuit is very low! And it's still better by far than a single circuit system where only a single point of failure can leave you completely devoid of brakes!
Steve