sphere

The proper Citroën workshop manual method—in contrast to what the Haynes manual says—is to loosen the suspension sphere with a chain wrench ¼ turn while the system is still under pressure. Be very careful and absolutely sure that it is really only by a quarter of a turn. The pressure in the system is huge (the force behind the sphere can reach more than one ton, that is several thousand pounds), so opening it up with all that high pressure liquid behind it can be extremely dangerous.