Brake booster

F4R or K4J or K4M or K9K

Tightening torques
brake booster mounting bolt	2.1 daN.m
battery cover screw	0.4 daN.m

Note: The brake booster pushrod cannot be removed. CAUTION

Anticipate brake fluid flow to prevent damage to mechanical parts and bodywork around the brake system.

REMOVAL

• Position the vehicle on a two-post lift.
• Remove the engine covers.
• Disconnect the battery, starting with the negative terminal.
• Remove the master cylinder (Mechanical controls chapter, Master cylinder, page 37A-1).

• Remove:

• the upper gearshift control ball joint (1),
• the cable sheath stop at (2) of the gearshift control cable.

WARNING

Any damage to the gearshift control cable retaining clip requires its replacement (Mechanical controls chapter).

• Remove the brake pedal clevis pin (3) from the brake booster pushrod inside the passenger compartment.

• Remove:

• the mounting clips (4) of the water box bulkhead,
• the brake booster mounting bolts (5).

INSTALLATION

• Before refitting, check the dimension:

• for left-hand drive vehicles: (X1) = 163.7 mm,
• for right-hand drive vehicles: (X1) = 133.2 mm.

• Refit in the reverse order of removal.
• Tighten the brake booster mounting bolts to torque (2.1 daN.m).

WARNING

Connect the battery; carry out the necessary relearn procedures (Chapter Battery).

• Refit the master cylinder (Mechanical controls chapter, Master cylinder, page 37A-1).
• Torque the battery cover screws (0.4 daN.m).
• Bleed the brake circuit (General chapter, Bleeding the brake circuit, page 30A-5).

F9Q

Tightening torques
brake booster mounting bolt	2.1 daN.m
gearshift control cable bracket mounting bolt	2.1 daN.m
EGR valve mounting bolts	0.9 daN.m
battery cover screw	0.4 daN.m

WARNING

Anticipate brake fluid flow to prevent damage to mechanical parts and bodywork around the brake system

REMOVAL

• Position the vehicle on a two-post lift.
• Remove the engine covers.
• Disconnect the battery, starting with the negative terminal.
• Remove the master cylinder (Mechanical controls chapter, Master cylinder, page 37A-1).

CAUTION Do not touch the gearbox selector spool.

• Remove:

• the exhaust gas recirculation valve mounting bolts (1),
• the exhaust gas recirculation valve (2),
• the gearshift control ball joints.

• Remove:

• the gearshift control ball joints (5),
• the cable sheath stop bracket mounting bolts (4),
• the cable sheath stop bracket.

Note: Any damage to the retaining clip requires its replacement (Mechanical controls chapter, External gear shift control, page 37A-42).

• Remove the brake pedal clevis pin from the brake booster pushrod, from inside the passenger compartment.

• Remove:

• the mounting clips (6) of the water box bulkhead,
• the brake booster mounting bolts (7), engine compartment side.

INSTALLATION

• Before refitting, check the dimension:

• for left-hand drive vehicles: (X1) = 163.7 mm,
• for right-hand drive vehicles: (X1) = 133.2 mm.

• Refit in the reverse order of removal.
• Tighten to the following torques:

• the brake booster mounting bolts (2.1 daN.m),
• the gearshift control cable bracket mounting bolts (2.1 daN.m),
• the exhaust gas recirculation valve mounting bolts (0.9 daN.m).

• Refit the master cylinder (Mechanical controls chapter, Master cylinder, page 37A-1).

WARNING

Connect the battery; carry out the necessary relearn procedures (Chapter Battery).

• Torque the battery cover screws (0.4 daN.m).
• Bleed the brake circuit (General chapter, Bleeding the brake circuit, page 30A-5).