Nissan Qashqai J11. Manual - part 889

BR-28

< REMOVAL AND INSTALLATION >

[LHD]

BRAKE MASTER CYLINDER

3.

Fix the cylinder body to a vise.

CAUTION:

• Place the reservoir tank with the chamfered pin hole (

)

facing up.

• Always set copper plates or cloth between vise when fix-

ing the cylinder body to a vise. Never overtighten the vise.

4.

Tilt the reservoir tank so that a mounting pin can be inserted.
Insert a mounting pin. Return the reservoir tank to the horizontal
position. Insert another mounting pin into the pin hole on the
opposite side in the same manner after the mounting pin passes
through the cylinder body pin hole.

CAUTION:

Never reuse the mounting pin.

Inspection

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INSPECTION AFTER INSTALLATION

Fluid Leak

Check for brake fluid leakage from the cylinder body-to-brake booster mounting face, reservoir tank mounting
face and brake tube connections.

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BRAKE BOOSTER

BR-29

< REMOVAL AND INSTALLATION >

[LHD]

C

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BRAKE BOOSTER

Exploded View

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HRA2DDT - MR20DD

K9K - R9M

Removal and installation

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REMOVAL

1.

Remove battery and bracket.

2.

Remove the cowl top. Refer to 

EXT-29, "Removal and Installation"

.

3.

Remove the instrument lower panel LH. Refer to 

IP-13, "Removal and Installation"

.

E1FIA0152GB

1.

Master cylinder assembly

2.

Brake booster

3.

Lock nut

4.

Gasket

5.

Spacer

Refer to 

GI-4, "Components"

 for symbols in the figure.

E1FIA0153GB

1.

Master cylinder assembly

2.

Brake booster

3.

Lock nut

4.

Gasket

5.

Spacer

Refer to 

GI-4, "Components"

 for symbols in the figure.

BR-30

< REMOVAL AND INSTALLATION >

[LHD]

BRAKE BOOSTER

4.

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

5.

Disconnect vacuum hose from brake booster. Refer to 

BR-32, "Exploded View"

.

6.

Remove master cylinder assembly. Refer to 

BR-26, "Removal and Installation"

.

7.

Disconnect the harness connector from the brake booster pressure sensor.

8.

Remove the brake booster pressure sensor.

9.

Remove the nuts on the brake booster and brake pedal.

CAUTION:

Secure the brake booster to avoid damage to components.

10. 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-18, "Inspection and Adjustment"

.

• After installation, perform the air bleeding. Refer to 

BR-12, "Bleeding Brake System"

.

CAUTION:

Never reuse drained brake fluid.

Inspection and Adjustment

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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

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Standard

Output rod length (A)

: Refer to 

BR-47, "Brake 

Booster"

.

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BRAKE BOOSTER

BR-31

< REMOVAL AND INSTALLATION >

[LHD]

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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-8, "Inspection and

Adjustment"

.

Standard

Input rod length (B)

: Refer to 

BR-47, "Brake 

Booster"

.

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