This is exactly the point with 2CV LHM master cylinder. They do not work as proper dual circuits but single circuits. Regardless of disc or drums on the front, when hitting the pedal, the fluid is pushed against rear wheel cylinder and front cylinders or caliper pistons at the same time. The rear cylinders can not operate if the front has no pressure. That is only possible if the master cylinder is a proper 2 circuits allowing some pressure in 2 separate closed circuits. If the front brakes fail, you have no rear brakes to rely on, only the useless hand brake unless its drums on the front

Hmm,so can anyone confirm this.The Haynes mannual,as Sean says,is crap.Someone must know.
Ken,what do you think,which way around would you fit the pipes?
Viking,do you set yours any way around?

I always place the pipe the ''correct'' way (front pipe to the rear) but have seen many 2cv's with the pipes the other way around. I leave them as I find them unless I work on the pipes etc. as it has no effect what way they are connected.

my second picture is the correct way that's with the foremost port connecting to the rears and the port in the resevoir for the fronts

this means that when the pedal is pressed the fronts are activated first

reversal is for vehicles equipped with load compensator valves(??)

attached is a scan of "Maintenance Handbook for Citroen Twins" from "Twin Horse stables" which is composed of various Citroen service bulletins.

^
As Sean said, plus here's another pic to help distinguish between one's AV and one's AR..



Brakes_0001 by slcchassis, on Flickr

Thank you gentlemen,sorted.