CITROEN C8 2002 Handbook page 121

DRAINING, FILLING AND BLEEDING THE BRAKING SYSTEM
Pre-conditions for bleeding a braking circuit:
After a repair on the master cylinder or ABS block, bleed in the following
order:
Front LH wheel.
Front RH wheel.
Rear LH wheel.
Rear RH wheel.
After a repair on a caliper or on a wheel cylinder, bleed in this order
(caliper or wheel cylinder removed) :
Front LH wheel.
Front RH wheel.
Rear LH wheel.
Rear RH wheel.
NOTE : If removing/refitting the master cylinder, it is advised to comple-
te the automatic bleed with a manual bleed.
ABS :
The hydraulic valve blocks are delivered pre-filled; it is thus possible to
perform:
- a manual bleed (using the pedal),
- an automatic bleed.
Should the bleed of the circuit prove unsatisfactory, it is possible to bleed
the ABS block using a diagnostic tool (See Tools), following the instruc-
tions given by the diagnostic tool.
Use of the diagnostic tool will be necessary in cases where the following
conditions all come together simultaneously:
- Air in the circuit.
- Regulation block active.
- Action on the brake pedal.
Bleeding.
IMPERATIVE : Start the engine.
WARNING : Respect the order of opening of the bleed screws.
Automatic bleed:
Position tool [2] on the brake fluid reservoir.
Connect tool [2] to an approved automatic bleed apparatus (See Tools).
Bleed the circuit, referring to the user instructions provided with the
apparatus.
Manual bleed (using the pedal):
Two operators are necessary.
Connect a transparent pipe on the bleed screw.
Press slowly on the brake pedal.
Open the bleed screw.
Keep the pedal pressed fully down.
Close the bleed screw.
Allow the brake pedal to rise gradually.
Repeat the operation until the brake fluid flows out clean and free of air
bubbles.
Proceed in an identical fashion in the case of all the other wheels.
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