CITROEN C4, C4 Picasso, C5 II, C5 (X7) & Dispatch
What the hazard is
This may occasionally affect braking assistance.
What to do
Citroën will write to owners of affected vehicles. Owners are advised to contact their authorised Citroën dealership to arrange for replacement of the vacuum pump valve.
Defect
The braking assistance circuit vacuum pump valve in very rare cases may have problems opening.