Hi Shane,The brakes don't circulate on any Citroen I know of. Bleed the brakes!!!! I bet you get black, moisture filled "stuff" come out (I have no doubt a 2cv is worse as moisture will just drop to the lowest point. In a hydraulic car it may well get boiled off as the hydraulic system heats up
When I bleed the hydraulic cars, I usually bleed into a glass jar ... until I get bright green fluid through. I'm not bleeding air out, I'm bleeding the probably 50year old fluid out of the brake lines!
You could change the cars LHM annually .... but if you have never bled the brakes.... You still have 50+ year old LHM in them
I didn't suggest the brakes circulate. Back to tinkering with the dyane
Cheers,
Andrew