Nissan Murano Z51. Manual - part 290

 

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Nissan Murano Z51. Manual - part 290

 

 

BRAKE BOOSTER

BR-31

< REMOVAL AND INSTALLATION >

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

BR-21, "Inspection and Adjustment"

.

• After installation, perform the air bleeding. Refer to 

BR-13, "Bleeding Brake System"

.

CAUTION:

Never reuse drained brake fluid.

Inspection and Adjustment

INFOID:0000000005516225

INSPECTION AFTER REMOVAL

Air Tight

CAUTION:

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

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.

Input Rod Length Inspection

1.

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

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

Standard

B

: Refer to 

BR-47, "Brake 

Booster"

.

JPFIA0020ZZ

BRA0037D

BR-32

< REMOVAL AND INSTALLATION >

BRAKE BOOSTER

• 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 during this operation.

• 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-9, "Inspection and

Adjustment"

.

JPFIA0043ZZ

JPFIA0044ZZ

VACUUM LINES

BR-33

< REMOVAL AND INSTALLATION >

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VACUUM LINES

Exploded View

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Removal and Installation

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REMOVAL

Remove the vacuum hose and tube.

INSTALLATION

Note the following, install the vacuum hose and tube.
• Because vacuum hose contains a check valve, it must be installed in the correct position. Refer to the stamp

to confirm correct installation. Brake booster will not operate normally if the hose is installed in the wrong
direction. 

• When installing vacuum hose, insert it until its tip reaches the

back-end of length (A) or further as shown in the figure.

- Face the marking side up when assembling of vacuum hose.

(Brake booster and intake manifold side)

- Face the marking side vehicle front when assembling of vacuum

hose. (Vacuum tube side)

CAUTION:

Never use lubricating oil during assembly.

Inspection

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INSPECTION AFTER REMOVAL

Appearance

Check for correct assembly, damage and deterioration.

Check Valve Airtightness

1.

Clamp

2.

Vacuum hose (built in check valve)

3.

Vacuum tube

4.

Vacuum hose

A.

To intake manifold

B.

Paint mark

C.

Stamp indicating engine direction

D.

To brake booster

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Standard 

A

: 24 mm (0.95 in) or more

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BR-34

< REMOVAL AND INSTALLATION >

VACUUM LINES

• Use a handy vacuum pump (A) to check.

• Replace vacuum hose assembly if vacuum hose and check valve

are malfunctioning.

When connected to the brake booster side (B)

: Vacuum should decrease within 1.3 kPa (10 mm-
Hg, 0.39 inHg) for 15 seconds under a vacuum of 

66.7 kPa (

500 mmHg, 

19.70 inHg).

When connected to the engine side (C):             

: Vacuum should not exist.

JPFIA0024ZZ

 

 

 

 

 

 

 

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