CITROËN C4 Handbook page 252

In the event of a breakdown
F Lower the vehicle fully.
F Fold the jack 2 and detach it.
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F Tighten the security bolt using the
wheelbrace 1 fitted with the security
socket 4.
F Tighten the other bolts using the
wheelbrace 1 only.
F Refit the bolt covers to the bolts (according
to equipment).
F Store the tools in the box.
After changing a wheel
To store the punctured wheel in the
boot correctly, first remove the central
cover.
When using the "space-saver" type
spare wheel, do not exceed 50 mph
(80 km/h).
Have the tightening of the bolts and the
pressure of the spare wheel checked
by a CITROËN dealer or a qualified
workshop without delay.
Have the punctured wheel repaired and
replace it on the vehicle as soon as
possible.