The Citroën Technical Guide by Željko Nastasic´and Gábor Deák Jahn - Includes invaluable explanations (in English) and diagrams of how Citroën’s Hydro-pneumatic suspension, brake and steering system works. Covers all models from the DS to the C5 including Hydractive and Activa.
Copies of this PDF file (605Kb) can be found all over the web (even offered for sale!); the link above is to the author's home page for the latest version and it's FREE!
2012 Subaru Forester - capable but no magic carpet
2011 Grand C4 Picasso VTR+ 1.6HDi - not missed!
1995 Xantia Estate SX 1.9TD in Vert Vega "The Green Lady" - sadly missed
1998 Xantia 2.1 VXD Estate in Mauritius Blue - R.I.P. (terminal tin-worm)