Nissan Qashqai J11. Manual - part 900

BR-72

< REMOVAL AND INSTALLATION >

[RHD]

BRAKE BOOSTER

BRAKE BOOSTER

Exploded View

INFOID:0000000010305464

MR20DD - HRA2DDT

K9K - R9M

Removal and installation

INFOID:0000000010305465

REMOVAL

1.

Remove battery and bracket.

2.

Remove cowl top cover. Refer to 

EXT-29, "Exploded View"

.

3.

Remove the instrument lower panel RH.

4.

Remove the knee protector.

E1FIA0152GB

1.

Master cylinder assembly

2.

Brake booster

3.

Lock nut

4.

Gasket

Refer to 

GI-4, "Components"

 for symbols in the figure.

E1FIA0153GB

1.

Master cylinder assembly

2.

Brake booster

3.

Lock nut

4.

Gasket

Refer to 

GI-4, "Components"

 for symbols in the figure.

BRAKE BOOSTER

BR-73

< REMOVAL AND INSTALLATION >

[RHD]

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5.

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

6.

Disconnect vacuum hose from brake booster..

7.

Remove master cylinder assembly. Refer to 

BR-69, "Removal and Installation"

.

8.

Disconnect the harness connector from the brake booster pressure sensor.

9.

Remove the brake booster pressure sensor.

10. Remove the nuts on the brake booster and brake pedal.

CAUTION:

Secure the brake booster to avoid damage to components.

11. Remove the brake booster.

CAUTION:

Never deform or bend the brake pipes.

INSTALLATION

Note the following, and installation is the reverse order of removal.

CAUTION:

• Be careful not to damage brake booster stud bolt threads. If brake booster is tilted during installa-

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

BR-62, "Inspection and Adjustment"

.

• After installation, perform the air bleeding. Refer to 

BR-56, "Bleeding Brake System"

.

CAUTION:

Never reuse drained brake fluid.

Inspection and Adjustment

INFOID:0000000010305466

INSPECTION AFTER REMOVAL

Output Rod Length Inspection

1.

With a handy vacuum pump, apply vacuum pressure of 

−

66.7

kPa (

−

500 mmHg, 

−

19.70 inHg, 

−

0.667 bar) to the brake

booster.

2.

Check the output rod length (A).

Input Rod Length Inspection

JPFIA0019ZZ

Standard

Output rod length (A)

: Refer to 

BR-90, "Brake 

Booster"

.

JPFIA0021ZZ

BR-74

< REMOVAL AND INSTALLATION >

[RHD]

BRAKE BOOSTER

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

• 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 INSTALLTION

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

BR-52, "Inspection and

Adjustment"

.

Standard

Input rod length (B)

: Refer to 

BR-90, "Brake 

Booster"

.

JPFIA0020ZZ

BRA0037D

JPFIA0043ZZ

JPFIA0044ZZ

VACUUM LINES

BR-75

< REMOVAL AND INSTALLATION >

[RHD]

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VACUUM LINES

Exploded View

INFOID:0000000010450972

MR20DD - HRA2DDT

K9K

JPFIA0087ZZ

1.

Clamp

2.

Vacuum hose

A.

To intake manifold

B.

To brake booster

C.

Paint mark

D.

Stamp indicating engine direction

JPFIA0088ZZ

1.

Clamp

2.

Vacuum hose (built in check valve)

3.

Vacuum tube

1.

Clip

2.

Vacuum hose

A.

To vacuum pump

B.

To brake booster

C.

Paint mark

D.

Stamp indicating engine direction