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Hydractive hydraulic suspension 3: EW7J4, EW10A, DV6TED4 and DW10BTED4 engines. Hydractive hydraulic suspension 3+: ES9A and DW12TED4 engines (prior to RPO No 10645). C6 (2005–2012) Hydractive hydraulic suspension 3+: Standard on all models. C5 III X7 (2007–2017) Hydractive hydraulic suspension 3+: Depends on country and trim.
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An active suspension is a type of automotive suspension that uses an onboard control system to control the vertical movement of the vehicle's wheels and axles relative to the chassis or vehicle frame, rather than the conventional passive suspension that relies solely on large springs to maintain static support and dampen the vertical wheel movements caused by the road surface.
The Hydractive system was soon to become available to the public first in Citroën's XM model 1989, and Xantia model 1993. In 1995 Activa prototypes' active anti-roll-bar was introduced in the Xantia Activa , making it one of the few production cars to have active suspension.
The hydraulic cylinder was fed with hydraulic fluid from the main pressure reservoir via a height corrector, a valve controlled by the mid-position of the anti-roll bar connected to the axle. If the suspension was too low, the height corrector introduced high-pressure fluid; if it was too high, it released fluid back to the fluid reservoir.
The BX shared its platform with the more conventional 405 that appeared in 1987, except the rear suspension which is from a Peugeot 305 Break. Among the features that set the car apart from the competition was the traditional Citroën hydropneumatic self-levelling suspension , extensive use of plastic body panels (bonnet, tailgate, bumpers ...
The Citroën XM is a front-engine, front-drive, five-passenger, five-door hatchback noted for its hydropneumatic suspension.Manufactured and marketed by Citroën from 1989 to 2000, with a minor facelift in 1994, XM production reached 333,405 over the course of 11 years.
This high-pressure hydraulic system would form the basis of over 9 million Citroën cars, including the DS, SM, GS, CX, BX, XM, Xantia, C5, and C6. Self-levelling suspension is the principal user benefit: the car maintains a constant ride height above the road, regardless of passenger and cargo load and despite the very soft suspension.