SUSPENSION (DE-PRESSURISING) for Your Citroen Xantia 4 Door Second Generation (1993-2002)

DE-PRESSURISING THE SUSPENSION CIRCUITS  
ALL TYPES  
Consequences  
Carry out the following operations  
Vehicle without hydractive suspension (Without SC.MAC valve)  
The suspension spheres are de-pressurised, wait for the vehicle to  
lower fully.  
1
2
Height control set to «LOW» position.  
Unscrew the pressure regulator release screw by 1 turn  
The main accumulator is de-pressurised.  
Vehicle without hydractive suspension in running order (With SC.MAC valve)  
1
2
3
Start the engine.  
Open the SC.MAC valves.  
Height control set to «LOW» position if the vehicle is on stands :  
raise the wheel(s) concerned.  
The suspension spheres + SC.MAC accumulator are de-pressurised.  
The main accumulator is de-pressurised  
Unscrew the pressure regulator release screw by 1 turn  
Vehicle with hydractive suspension in running order (With or without SC.MAC valve)  
The electrovalves of the hydractive regulators are energised.  
Open the SC.MAC valves.  
Start the engine.  
1
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DE-PRESSURISING THE SUSPENSION CIRCUITS (continued)  
ALL TYPES  
Carry out the following operations  
Consequences  
Height control set to «LOW» position if the vehicle is on stands :  
raise the wheel(s) concerned.  
The suspension spheres + hydractive regulator accumulators  
+ SC.MAC regulator are de-pressurised.  
2
3
Unscrew the pressure regulator release screw by 1 turn  
The main accumulator is de-pressurised.  
Vehicle with hydractive suspension not in running order (With or without SC.MAC valve)  
1
2
Unscrew the pressure regulator release screw by 1 turn  
The main accumulator is de-pressurised.  
The SC.MAC accumulator is de-pressurised.  
Height control set to «LOW» position.  
Uncouple the pressure regulator outlet pipe.  
Couple the outlet pipe with the pump 4135-T + union(s) or 4034-T +  
union (S) and (O) from tool kit 4146-T.  
3
4
Switch on the ignition.  
The electrovalves of the hydractive regulators are energised.  
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ALL TYPES  
DE-PRESSURISING THE SUSPENSION CIRCUITS (continued)  
Consequences  
Carry out the following operations  
5
6
Establish a pressure of 150 to 180 Bars if the vehicle is on stands :  
raise the wheel(s) concerned.  
The suspension spheres + hydractive regulator accumulators are  
de-pressurised.  
Open the bleed screw of the pump 4135-T or 4034-T, remove the  
tools.  
The supply circuit is de-pressurised.  
Vehicle with SC.CAR, Citroën Active Roll Control, in running order  
The electrovalves of the hydractive regulators are energised, and the  
SC.MAC valves are opened.  
1
2
Start the engine  
The suspension spheres + hydractive regulator accumulators  
+ SC.MAC regulator are de-pressurised.  
Height control set to «LOW» position.  
3
4
5
Stop the engine.  
Unscrew the pressure regulator release screw by 1 turn.  
The main accumulator is de-pressurised.  
Open the SC.CAR regulator bleed screw.  
The SC.CAR regulator accumulator is de-pressurised.  
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DE-PRESSURISING THE SUSPENSION CIRCUITS (continued)  
ALL TYPES  
Carry out the following operations  
Consequences  
The SC.CAR accumulator is de-pressurised.  
Vehicle with SC.CAR, Citroën Active Roll Control, not in running order  
6
Activate 4 to 5 times alternately the two SC.CAR corrector link rods.  
1
2
Unscrew the pressure regulator release screw by 1 turn.  
The main accumulator is de-pressurised.  
The SC.MAC accumulator is de-pressurised.  
Height control set to «LOW» position.  
Open the SC.CAR regulator bleed screw.  
3
4
The SC.CAR regulator accumulator is de-pressurised.  
Activate 4 to 5 times alternately the two SC.CAR corrector link rods. The SC.CAR accumulator is de-pressurised.  
Uncouple the SC.CAR accumulator supply pipe, plug the pipe using  
the unions 4146-T (M) and (V).  
5
6
Uncouple the pressure regulator outlet pipe, couple the pipe to the  
pump 4135-T + 4146-T.S or 4034-T + 4136-T (S) and (O).  
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DE-PRESSURISING THE SUSPENSION CIRCUITS (continued)  
ALL TYPES  
Carry out the following operations  
Consequences  
7
8
Switch on the ignition.  
The electrovalves of the hydractive regulators are energised.  
Establish a pressure of 150 to 180 Bars if the vehicle is on stands :  
raise the wheel(s) concerned.  
The suspension spheres + hydractive regulator accumulators are  
de-pressurised.  
Open the bleed screw of the pump 4135-T or 4034-T, remove the  
tools.  
The supply circuit is de-pressurised.  
9
254  
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DE-PRESSURISING THE SUSPENSION CIRCUITS (continued)  
ALL TYPES  
SPECIFIC CASES  
The suspension can be de-pressurised on each axle individually.  
ESSENTIAL : The height corrector must be operated in the «LOW» position.  
Carry out the following operations  
Consequences  
Vehicle with or without hydractive suspension - Front axle (With SC.MAC valves)  
1
2
Unscrew the pressure regulator release screw by 1 turn.  
The main accumulator is de-pressurised.  
Uncouple the pressure inlet pipe (1) from the height corrector.  
Connect the pump 4135-T or 4034-T - 4146-T.O.  
B3BP136C  
The electrovalves of the hydractive regulators are energised.  
3
Hydractive Vehicle : Switch on the ignition.  
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DE-PRESSURISING THE SUSPENSION CIRCUITS (continued)  
ALL TYPES  
Carry out the following operations  
Consequences  
The suspension spheres + hydractive regulator accumulators +  
SC.MAC accumulator (front suspension settling) are de-pressurised.  
Establish a pressure (100 to 180 Bars) to control the slide valves of  
the SC.MAC valve and hydractive regulator.  
4
5
Open the bleed screw of the pump 4135-T or 4034-T, remove the tools.  
The supply circuit is de-pressurised.  
Vehicle with or without hydractive suspension - Rear axle (With SC.MAC valves)  
The main accumulator is de-pressurised.  
Unscrew the pressure regulator release screw by 1 turn.  
1
2
Uncouple the pipe (2) of the SC.MAC valve. Couple the pump  
4135-T or 4034-T.O + 4146-T.O to the SC/MAC valve.  
B = With hydractive  
A= Without hydractive  
B3BP137C B3BP138C  
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DE-PRESSURISING THE SUSPENSION CIRCUITS (continued)  
ALL TYPES  
Carry out the following operations  
Consequences  
3
The electrovalves of the hydractive regulators are energised.  
Vehicle with hydractive suspension : switch on the ignition  
The suspension spheres + hydractive regulator accumulators  
+ SC.MAC accumulator (front suspension settling) are de-pressurised.  
Establish a pressure (80 to 180 Bars) to control the slide valves of  
the SC.MAC valve and hydractive regulator.  
4
5
Open the bleed screw of the pump 4135-T or 4034-T, remove the tools.  
The supply circuit is de-pressurised.  
Vehicle with hydractive suspension (without SC.MAC valve)  
Work on the hydractive regulator which controls the axle to be repaired.  
Unscrew the pressure regulator release screw by 1 turn.  
1
2
The main accumulator is de-pressurised.  
Uncouple the pipe (3) of the hydractive regulator. Couple the pump  
4135-T or 4034-T + 4146-T.O.  
B3BP139C  
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DE-PRESSURISING THE SUSPENSION CIRCUITS (continued)  
ALL TYPES  
Carry out the following operations  
Consequences  
3
4
5
Switch on the ignition.  
The electrovalves of the hydractive regulators are energised.  
The suspension spheres + hydractive regulator accumulators  
(suspension settling) are de-pressurised.  
Establish a pressure (80 to 180 Bars) to control the slide valves of  
the hydractive regulator.  
Open the bleed screw of the pump 4135-T or 4034-T, remove the  
tools.  
The supply circuit is de-pressurised.  
Vehicle with SC.CAR: Citroën Active Roll Control  
1
2
Unscrew the pressure regulator release screw by 1 turn.  
Height control set to «LOW» position.  
The main accumulator is de-pressurised  
The SC.MAC accumulator is de-pressurised.  
The SC.CAR regulator accumulator is de-pressurised.  
3
4
Open the SC.CAR regulator bleed screw.  
Activate 4 to 5 times alternately the two SC.CAR corrector link rods. The SC.CAR accumulator is de-pressurised  
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DE-PRESSURISING THE SUSPENSION CIRCUITS (continued)  
ALL TYPES  
Carry out the following operations  
Consequences  
Uncouple the SC.CAR accumulator supply pipe, plug the pipe with  
the unions 4146-T.M and V.  
5
Front suspension : special case (without SC.MAC valve)  
(See page 242)  
Rear suspsion : special case (without SC.MAC valve)  
(See page 240)  
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FILLING AND BLEEDING THE SUSPENSION CIRCUITS (continued)  
Carry out the following operations  
Consequences  
1
2
3
LHM fluid level to the max. mark.  
Loosen the pressure regulator release screw.  
Start the engine.  
Tighten and slacken the pressure regulator release screw several  
times, then retighten it.  
4
Priming of the high pressure (HP) pump.  
5
6
Height control set to «HIGH» position.  
Wait for the vehicle to rise fully.  
LHM fluid topped up.  
Top up the level : engine running, vehicle in the high position.  
260  
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Related Topics

De-pressurising the suspension circuits
Filling and bleeding the suspension circuits

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