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The XM
- the replacement for the CX,
employed high prressure hydraulics for the brakes, steering and
suspension and like the BX used McPherson struts fitted with
hydropneumatic spheres at the front. Where the XM differed from its
predecessors was in the fitting of Hydractive suspension whereby a
third sphere was fitted to each axle. This third sphere was switched in
and out of circuit and was controlled by an on-board computer. When the
third sphere was in-circuit, the ride was soft with little roll
stiffness - like other hydropneumatic cars; when the sphere was out of
circuit, the ride stiffened up and little body roll occurred; thereby
improving handling and grip while retaining the legendary comfort for
which hydropneumatic suspension is renowned.
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