74 Pressure Regulators Suspension
Citroen XM Internet Reference Version 1.0 111
3/3/99
74 Pressure Regulators
I’m having fun with the hydraulics on my XM. I have a 1990 XM2.0si which has developed a leaky
pressure regulator. After tightening everything up, and speaking to Citroen, it turned out that it was
broken ’internally’ and needed replacing. I purchased a second hand replacement (ukp 45 + vat from
Europarts), and fitted it.
The problem is, the suspension wants to be in rock hard mode all the time. If I start the car up and raise
and lower the suspension, it goes ’soft’ and I can bounce the car around, but after a few hundred yards
of driving, it goes hard. Having not worked on XM hydraulics before, I suspect that I am not bleeding the
system properly. I’ve read something about the high pressure pump needing to be primed etc. Does
anyone know the proper procedure to be followed? One thing I should mention is that the suspension
was behaving like this shortly before I changed the leaky pressure regulator, as well as after. The
spheres were recharged four months ago.
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This is a standard problem with all early XM’s
It may be caused by bad earthing on any of the wiring that applies to the suspension or it may be caused
by poor joints in the suspension computer.
Self-bleeding
The suspension and steering circuits is self-bleeding - if the car rises, it’ll bleed itself.
The brakes are bled as normal. If the pump needs priming (after taking the reservoir out), then no LHM
will get to the pump, as it’ll be sucking air in only. The car won’t rise.
I’d say it’s time to change the fluid, and it probably needs a damn good clean - there’s stuff out there that
you put in in place of the LHM to flush it all out, then change it for LHM after a while. If it’s soft at first,
then it’s unlikely to be the spheres flat.
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