Infiniti FX35, FX50 (S51). Manual - part 234

 

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Infiniti FX35, FX50 (S51). Manual - part 234

 

 

BRAKE BOOSTER

BR-33

< REMOVAL AND INSTALLATION >

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BRAKE BOOSTER

Exploded View

INFOID:0000000005234189

WITHOUT ICC

WITH ICC

Removal and installation

INFOID:0000000005234190

REMOVAL

CAUTION:

1.

Master cylinder assembly

2.

Brake booster

3.

Vacuum sensor (with VK50VE)

4.

Lock nut

5.

Clevis

6.

Gasket

Refer to 

GI-4, "Components"

 for symbols in the figure.

JPFIA0420GB

1.

Master cylinder assembly

2.

Brake booster

3.

Vacuum sensor (with VK50VE)

4.

Solenoid valve

5.

Lock nut

6.

Clevis

7.

Gasket

Refer to 

GI-4, "Components"

 for symbols in the figure.

JPFIA0417GB

BR-34

< REMOVAL AND INSTALLATION >

BRAKE BOOSTER

• Never remove solenoid valve (with ICC) and vacuum sensor (VK50VE) from brake booster.
• Replace solenoid valve (with ICC), vacuum sensor (VK50VE) and brake booster as a set.
1.

Remove master cylinder cover.

2.

Remove hoodledge cover. Refer to 

EXT-22, "Exploded View"

.

3.

Separate solenoid valve harness connector (with ICC) and vacuum sensor harness connector (with
VK50VE).

4.

Remove brake master cylinder assembly. Refer to 

BR-29, "Exploded View"

.

CAUTION:

• Depress the brake pedal several times to release the vacuum pressure from the brake booster.

Then remove the master cylinder assembly.

• Never depress the brake pedal after the master cylinder assembly is removed.
• The piston of the master cylinder assembly is exposed. Never damage it when removing the

master cylinder.

• The piston may drop off when pulled out strongly. Never hold the piston. Hold the cylinder body

when handling the master cylinder assembly.

5.

Remove vacuum hose from brake booster. Refer to 

BR-37, "Exploded View"

.

6.

Remove instrument lower panel LH. Refer to 

IP-11, "Exploded View"

.

7.

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

8.

Remove engine room cover (left side). (VK50VE) Refer to 

EM-

174, "Exploded View"

.

9.

Remove low-pressure flexible hose bracket, place where low-
pressure flexible hose and tube will not interfere with work.
Refer to 

HA-40, "Exploded View"

 (VQ35HR), 

HA-96, "Exploded

View"

 (VK50VE).

10. Remove brake tube [between master cylinder and ABS actuator

and electric unit (control unit)]. Refer to 

BR-20, "FRONT :

Exploded View"

.

11. Separate brake tube [between ABS actuator and electric unit

(control unit) and front brake hose] from ABS actuator and electric unit (control unit). Refer to 

BR-20,

"FRONT : Exploded View"

.

12. Remove nuts on brake booster and brake pedal assembly. Refer to 

BR-18, "Exploded View"

.

CAUTION:

Hold the brake booster so as to avoid dropping out.

13. Remove brake booster from dash panel in engine room side.

CAUTION:

Never deform or bend the brake tubes.
NOTE:
If removing brake booster is difficult, remove clevis from brake booster.

INSTALLATION

Note the following, and install in the reverse order of removal.
• Be careful not to damage brake booster stud bolt threads. If brake booster is tilted during installation, the

dash panel may damage the threads.

•  Never deform or bend the brake tubes when installing the brake booster.
• Always use a new gasket between the brake booster and the dash panel.
• Replace the clevis pin if it is damaged. Refer to 

BR-19, "Inspection and Adjustment"

.

• Install the brake pedal assembly and brake booster mounting nuts, and tighten it to the specified torque.
• After installation, perform the air bleeding. Refer to 

BR-11, "Bleeding Brake System"

.

CAUTION:

Never reuse drained brake fluid.

Inspection and Adjustment

INFOID:0000000005234191

INSPECTION BEFORE REMOVAL

Air Tight

CAUTION:

Check the air tight condition when the master cylinder and the brake booster is installed.

JPFIA0019ZZ

BRAKE BOOSTER

BR-35

< REMOVAL AND INSTALLATION >

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1.

With a handy vacuum pump, apply vacuum pressure of –66.7 kPa (–500 mmHg, –19.70 inHg) to the
brake booster.

2.

If the air tight condition cannot be maintained, perform the following operation.

a.

Check the no dirt and dust are present on the brake booster and brake master cylinder mating faces.
Clean it if necessary.

b.

Check O-ring on the master cylinder. If anything is found, replace the O-ring.

c.

Check the air tight condition again. If the condition still cannot be maintained, replace the brake booster.

INSPECTION AFTER REMOVAL

Input Rod Length Inspection

1.

Loosen the lock nut (1) and adjust the input rod (2) to the speci-
fied length (A).

2.

Tighten the lock nut to the specified torque.

INSPECTION AFTER INSTALLATION

Operation

Depress the brake pedal several times at 5-second intervals with the
engine stopped. Start the engine with the brake pedal fully
depressed. Check that the clearance between brake pedal and dash
lower pane decreases.
NOTE:
A slight impact with a small click may be felt on the pedal when the
brake pedal is fully depressed. This is a normal phenomenon due to
the brake system operation.

Air Tight

• Idle the engine for 1 minute to apply vacuum to the brake booster,

and stop the engine. Then depress the brake pedal several times
at 5-second intervals until the accumulated vacuum is released to
atmospheric pressure. Check that the clearance between brake
pedal and dash lower panel gradually increases (A 

 B 

 C) each

time the brake pedal is depressed when performing this operation.

Standard

A

: Refer to 

BR-66, "Brake Booster"

.

JPFIA0238ZZ

BRA0037D

JPFIA0043ZZ

BR-36

< REMOVAL AND INSTALLATION >

BRAKE BOOSTER

• Depress the brake pedal with the engine running. Then stop the

engine while holding down the brake pedal. Check that the brake
pedal stroke does not change after holding down the brake pedal
for 30 seconds or more.
NOTE:
A slight impact with a small click may be felt on the pedal when the
brake pedal is fully depressed. This is a normal phenomenon due
to the brake system operation.

ADJUSTMENT AFTER INSTALLATION

Perform the brake pedal adjustment after installing the brake pedal assembly. Refer to 

BR-7, "Inspection and

Adjustment"

.

JPFIA0044ZZ

 

 

 

 

 

 

 

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