The Xantia Active uses a 6+2 hydraulic pump, the same as all Xantia's
with the anti sink system. This uses the 6 piston part of the hydraulic
pump for the power steering and the much smaller 2 pistons are left to
get the car up and do the braking. As you can see the suspension and
braking curcuits need to put a high demand on such a small pump, This
together with the fact that the Activa has 10 spheres is probabaly the
reason why you can hear the pump running for so long.
The spheres are as follows.
2 x front suspension spheres
1 x front suspension accumulator sphere
1 x front active ride sphere
1 x main accumulator sphere
2 x rear suspension spheres
1 x rear suspension accumulator sphere
1 x rear active ride sphere
1 x anti sink sphere
Have they all been changed? as when the system is out of pressure, it
will take longer to fill flat spheres with fluid than fully charged
ones. Even the newest of the Xantia's will certainly need a sphere
change by now, as typicaly a Xantia will get through it's spheres in
about 3 years.
I agree the Activa is one fantastic car to drive, but there is the
potential for a lot of trouble, this is why they did not sell very many
here in the UK.