On Fri, 09 Aug 2013 16:36:37 +0100, Fredxx wrote:

They ran off the same hydraulic pump, though I thought the baking system
had a separate accumulator.

Only on CXs and SMs, where it was needed because of the very high demands
of the self-centring steering.

Some had rear brakes which had a variable pressure limit according to
the suspension are position, ie weight proportionate.

All hydraulically suspended Citroens take the rear brake pressure from
the rear suspension circuit, so - yep - load-proportioning.