Infiniti QX56 (Z62). Manual - part 124

BR-28

< REMOVAL AND INSTALLATION >

HYDRAULIC BOOSTER ASSEMBLY

HYDRAULIC BOOSTER ASSEMBLY

Exploded View

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REMOVAL

DISASSEMBLY

1.

Hydraulic booster assembly

2.

Lock nut

3.

Clevis

Refer to 

GI-4, "Components"

 for symbols in the figure.

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HYDRAULIC BOOSTER ASSEMBLY

BR-29

< REMOVAL AND INSTALLATION >

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Removal and Installation

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REMOVAL

1.

Turn the ignition switch OFF.

CAUTION:

Never turn the ignition switch ON before the completion of the installation procedure. 

2.

Drain brake fluid. Refer to 

BR-10, "Draining"

.

3.

Depress the brake pedal 20 times or more to release the pressure from the accumulator.

CAUTION:

Always perform this step before removing the hydraulic booster assembly.

4.

Disconnect hydraulic booster assembly harness connector.

5.

Separate the brake tube from hydraulic booster assembly with a flare nut wrench. Refer to 

BR-22,

"FRONT : Exploded View"

.

6.

Remove brake tube from clip.

1.

Reservoir cap

2.

Label

3.

Reservoir tank

4.

Pin

5.

Motor/accumulator assembly

6.

Brake tube

7.

Brake hose assembly

8.

Grommet

9.

Harness band

10. Collar

11.

Bushing

12. Pin mount

13. Grommet

14. Bracket

15. Cap

16. Bushing

17. Bracket

18. ABS actuator and electric unit (con-

trol unit)

19. Gasket

20. Spacer

: Apply brake fluid.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

JPFIA0748GB

BR-30

< REMOVAL AND INSTALLATION >

HYDRAULIC BOOSTER ASSEMBLY

7.

Remove snap pin (1) and clevis pin (2) from clevis.

8.

Remove nuts on hydraulic booster assembly and brake pedal
assembly.

CAUTION:

Hold the hydraulic booster assembly so as to avoid drop-
ping out.

9.

Remove hydraulic booster assembly.

CAUTION:

• Always hold (A) when removing the hydraulic booster

assembly.

• Never deform or bend the brake tubes when removing the

hydraulic booster assembly.

• Always use a cushion or an equivalent to place the

hydraulic booster assembly. Failure to do this may cause
uneven loads or impact and result in a malfunction.

10. After replacing hydraulic booster assembly, always follow the

accumulator disposal procedure to discard the hydraulic booster
assembly. Refer to 

BR-33, "Disposal"

.

INSTALLATION

Note the following, and install in the reverse order of removal.
• Perform adjustment before installation. Refer to 

BR-32, "Inspection and Adjustment"

.

• Never reuse a hydraulic booster assembly after an excessive impact. (Slight impulse caused during installa-

tion work is acceptable.)

• Never turn the ignition switch ON before the completion of the installation procedure.
• Be careful not to damage hydraulic booster assembly stud bolt threads. If hydraulic booster assembly is

tilted during installation, the dash panel may damage the threads.

• Always hold (A) when removing the hydraulic booster assembly.
• Never deform or bend the brake tubes when installing the hydraulic

booster assembly.

• Always use a new gasket between the hydraulic booster assembly,

spacer and the dash panel.

• Replace the clevis pin if it is damaged. Refer to 

BR-21, "Inspection

and Adjustment"

.

• Perform the air bleeding. Refer to 

BR-11, "Bleeding Brake Sys-

tem"

.

• Perform the brake pedal adjustment after installing the brake pedal

assembly and hydraulic booster assembly. Refer to 

BR-7, "Inspec-

tion and Adjustment"

.

• Perform inspection after installation. Refer to 

BR-32, "Inspection and Adjustment"

.

Disassembly and Assembly

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DISASSEMBLY

CAUTION:

Disassemble the hydraulic booster assembly when necessary.

1.

Remove gaskets and spacer from hydraulic booster assembly.

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HYDRAULIC BOOSTER ASSEMBLY

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2.

Remove the reservoir tank mounting pin with a pin punch (com-
mercial service tool).

3.

Remove bolt and remove the reservoir tank and grommets from
the ABS actuator and electric unit (control unit).

CAUTION:

Never drop the removed parts. The parts must not be
reused if they are dropped.

4.

Slide the clamp and remove brake hose assembly.

5.

Remove the brake tube with a flare nut wrench.

CAUTION:

Never scratch the flare nut and the brake tube.

6.

Remove the cap with a suitable tool (A).

7.

Remove grommets and screws (

) and remove motor/accumu-

lator assembly harness.

8.

Cut harness band.

CAUTION:

Never damage the harness.

9.

Remove motor/accumulator assembly from ABS actuator and
electric unit (control unit).

10. Remove bushings and collars from motor/accumulator assem-

bly.

11. Remove brackets and bushing from ABS actuator and electric

unit (control unit).

12. Remove pin mount.

13. After replacing motor/accumulator assembly, always follow the accumulator disposal procedure to discard

the motor/accumulator assembly. Refer to 

BR-33, "Disposal"

.

ASSEMBLY

Note the following, and assembly in the reverse order of disassembly.
• Never use mineral oils such as kerosene or gasoline and rubber grease during the cleaning and assembly

process.

• Never drop the removed parts when installing. The parts must not be reused if they are dropped.
• Never allow foreign matter (e.g. dust) and oils other than brake fluid to enter the reservoir tank.
• For non reusable parts, refer to 

BR-28, "Exploded View"

.

• When connecting motor/accumulator assembly harness, check the

order of harness colors.

• Temporarily tighten the brake tube flare nut to the motor/accumula-

tor assembly and ABS actuator and electric unit (control unit) by
hand. Then tighten it to the specified torque with a crowfoot and
torque wrench.

CAUTION:

Never scratch the flare nut and the brake tube.

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JPFIA0751ZZ

A

:  Black

B

:  Red

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