Page 65 of 105
STEERING ASSEMBLY
Steering column
36
If the switch is being replaced, the new part is
supplied ready-centred, held in place by an
adhesive label which tears off when the steering
wheel is moved for the first time (fit with the
wheels straight).
12970S
Remove:
- the half cowlings (three bolts),
- the stalk - switch assembly (one bolt).
12967-1R
12971R
Disconnect the connectors.
36-13
Page 66 of 105
STEERING ASSEMBLY
Steering column
36
Remove:
- the instrument panel visor ( six bolts).
12970-1R1
- the four mounting bolts for the instrument
panel and disconnect the connectors.
12969-1R1
12968S
- the lower protector ( four bolts).
12966R
36-14
Page 67 of 105
STEERING ASSEMBLY
Steering column
36
Under the vehicle, cut the retaining clip for the
rubber gaiter and push it back towards the
bulkhead.
Remove the eccentric bolt from the universal
joint.
Remove the two bolts and the two nuts mounting
the steering column.
12964R2
12965-1R2
Release:
- the steering column after disconnecting the
ignition switch,
- the gaiter from the bulkhead ( 1 ) and remove
it with the steering column.
REFITTING
Refit the steering column.
Fit the gaiter on the bulkhead, having tied the
flaps and the universal joint together with string.
Refitting is then the reverse of removal.
Check the instrument panel connectors are
correctly reconnected.
13116S
Remove the mounting bolts for the dashboard on
the steering column.
36-15
Page 68 of 105

STEERING ASSEMBLY
Steering column
36
IMPORTANT : if these instructions are not
followed exactly the system may not operate
normally and could even be triggered incorrectly.
IMPORTANT
Before reconnecting the driver’s airbag cushion,
check to see if the system is operating correctly as
follows:
•check the airbag warning light on the
instrument panel is illuminated when the
ignition is on,
•connect a dummy ignition module to the
driver’s airbag connector and check that the
warning light extinguishes,
•switch the ignition off, connect the airbag
cushion in place of the dummy ignition module
and secure the cushion to the steering wheel,
•switch the ignition on. Check the warning light
illuminates for three seconds when the ignition
is switched on then extinguishes and remains
extinguished.
If the warning light does not operate as described
above, refer to the fault finding section and check
the system using the
XRBAG (Elé. 1288).
SPECIAL NOTES FOR VEHICLES FITTED WITH A
DRIVER’S AIRBAG
Ensure that the wheels are still straight.
Check that the rotary switch is still immobilised
before refitting.
If it is not, follow the method for centring
described in section 88 "driver’s airbag".
Renew the steering wheel bolt each time it is
removed ( pre-bonded bolt).
Observe the correct tightening torque ( 4.5
daN.m).
36-16
Page 69 of 105

MECHANICAL ELEMENT CONTROLS
Master cylinder
37
Hydraulic pipe unions 1.7
Mounting nut on brake servo 1.8
REMOVAL
Disconnect the battery.
Disconnect the brake fluid level detector
connector.
Remove the injection computer (depending on
version).
Release the PAS reservoir and move it to the side,
towards the engine.
Drain and remove, by pulling up, the brake fluid
reservoir (take care to catch the fluid which will
run out).
Remove:
- the pipes and note their positions,
- the two mounting nuts on the brake servo.
REFITTING
Refitting is the reverse of removal.
Check the length of the pushrod.
Dimension X = 22.3 mm.
Depending on model, adjust using pin (P).
91101R
NOTE : these vehicles have a master cylinder
which is integral to the brake servo. Sealing of the
brake servo is directly linked to that of the master
cylinder. During any operation, a new seal (A)
must be fitted.
Fit the master cylinder in alignment with the
brake servo so that pushrod pin (P) enters
correctly into the master cylinder housing.
TIGHTENING TORQUES (in daN.m)
DI3718
37-1
Page 70 of 105
MECHANICAL ELEMENT CONTROLS
Master cylinder
37
Fill the brake fluid reservoir and bleed the brake
circuit.
MASTER CYLINDER (EXCHANGE)
The kit sold by the Parts Department comprises :
- one master cylinder (4 outlets or 2 outlets for
ABS),
- two plugs (A),
- two mounting nuts (B).
DI3719
37-2
Page 71 of 105
MECHANICAL ELEMENT CONTROLS
Brake servo
TIGHTENING TORQUES (in daN.m)
Mounting nut on brake servo 1.8
Brake servo on bulkhead 2.3
- remove the 4 brake servo mounting nuts,
- remove the brake servo.
REFITTING
Before refitting, check:
-dimension L = 104.8 mm ,
-dimension X = 22.3 mm .The brake servo cannot be repaired. Operations
are only allowed on:
- the air filter,
- the non-return valve.
REMOVAL
Disconnect and remove the battery.
Remove:
- the master cylinder (following the method
described previously),
- the battery protection plate (4 bolts, 1 nut),
- the two mounting nuts for the expansion
bottle and move it towards the engine.
Disconnect the flexible vacuum hose from the
brake servo.
In the passenger compartment:
- remove the pin ( A ) from the clevice
connecting the brake pedal to the pushrod by
moving the clip,
37
91101R2
97860R
Refitting is the reverse of removal.
Bleed the brake circuit.
37-3
Page 72 of 105

SPECIAL TOOLING REQUIRED
Mot 453 -01 Hose clamp pliers
MECHANICAL ELEMENT CONTROLS
Brake servo
The sealing of the brake servo is checked on the
vehicle when the hydraulic circuit is in operating
condition.
Connect the vacuum pump between the brake
servo and the vacuum source (inlet manifold)
using a "T" union and the shortest possible pipe.
Run the engine at idle speed for one minute.
Clamp the pipe (clamp Mot. 453-01) between the
"T" union and the vacuum source.
Turn the engine off.If the vacuum drops by more than 33 mbar (25
mm/Hg) in 15 seconds, there is a leak located
either :
- at the non-return valve (replace it),
- or at the pushrod diaphragm (replace the
brake servo).
If the brake servo is not operational the braking
system will operate but the force required at the
pedal to obtain the equivalent deceleration as for
assisted braking is considerably higher .
CHECKING SEALING
When checking the sealing of the brake servo, ensure the seal between the brake servo and the master
cylinder is perfect. If there is a leak, replace the seal (A).
37
DI3701
EQUIPMENT REQUIRED
Vacuum pump
Petrol engine
37-4