Nissan Versa Sedan. Manual - part 98

BR-30

< REMOVAL AND INSTALLATION >

BRAKE BOOSTER AND CHECK VALVE

BRAKE BOOSTER AND CHECK VALVE

Exploded View

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Removal and installation

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REMOVAL

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.
1. Remove brake master cylinder assembly. Refer to 

BR-27, "Removal and Installation"

.

2. Remove vacuum hose from check valve. Refer to 

BR-33, "Removal and Installation"

.

3. Remove and discard the clip (1) and clevis pin (2). Refer to 

BR-

19, "Exploded View"

.

4. Remove nuts on brake booster and brake pedal assembly. Refer

to 

BR-19, "Exploded View"

.

5. Remove brake booster from dash panel on engine room side.

CAUTION:

Do not deform or bend the brake tubes.

NOTE:

If removing brake booster is difficult, remove clevis from brake

booster.

6. Remove check valve from brake booster.
7. Perform inspection after removal. Refer to 

BR-31, "Inspection and Adjustment"

.

INSTALLATION

CAUTION:

Do not spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it

off immediately and wash with water if it gets on a painted surface.

Note the following, and install in the reverse order of removal.

1.

Master cylinder assembly

2.

Check valve

3.

Brake booster

4.

Lock nut

5.

Clevis

6.

Gasket

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2014 Versa Sedan

BRAKE BOOSTER AND CHECK VALVE

BR-31

< REMOVAL AND INSTALLATION >

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• Set check valve angle (A) as shown.

• Be careful not to damage brake booster stud bolt threads. If brake

booster is tilted during installation, the dash panel may damage the

threads.

• Do not 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 and clip during installation. Refer to 

BR-20,

"Inspection and Adjustment"

.

• Do not allow foreign matter (e.g. dust) and oils other than brake fluid to enter the reservoir tank.

• After installation, perform the air bleeding. Refer to 

BR-12, "Bleeding Brake System"

.

CAUTION:

Do not reuse drained brake fluid.

• Check each item of brake pedal. Adjust it if the measurement value is not the standard. Refer to 

BR-8,

"Inspection and Adjustment"

.

Inspection and Adjustment

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INSPECTION BEFORE REMOVAL

Brake System Vacuum Inspection

CAUTION:

Check the vacuum condition when the master cylinder and the brake booster are installed.
1. Check the vacuum using a suitable tool.

2. If the vacuum cannot be maintained, perform the following operation.
a. Check that dirt and dust are not present on the brake booster and brake master cylinder mating surfaces.

Clean the mating surfaces if necessary.

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

BR-27,

"Removal and Installation"

.

c. Check the vacuum condition again. If the condition still cannot be maintained, replace the brake booster.

INSPECTION AFTER REMOVAL

Check Valve Vacuum Inspection

1. Check the vacuum using a suitable tool.

2. If the vacuum still cannot be maintained, replace the check valve.

Input Rod Length Inspection

(A)

: 45

°

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At vacuum of 

−66.7 kPa (−500 mmHg, 

−19.69 inHg)

: Vacuum should decrease within 3.3 kPa (24.8 mmHg, 
0.98 inHg) for 15 seconds.

When connected to the 
booster side

: Vacuum should decrease within 1.3 kPa (9.8 mmHg, 0.38 inHg) 
for 15 seconds under a vacuum of 

−66.7 kPa (−500 mmHg, −

19.69 inHg).

When connected to the 
vacuum hose side

:Vacuum should not exist.

2014 Versa Sedan

BR-32

< REMOVAL AND INSTALLATION >

BRAKE BOOSTER AND CHECK VALVE

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

1. Run the engine at idle 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 each time the brake pedal is depressed when performing this operation.

2. 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 sec-

onds or more.

ADJUSTMENT AFTER INSTALLATION

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

BR-8, "Inspection and

Adjustment"

.

(A)

: Refer to 

BR-45, "Brake Booster"

.

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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

1. Remove the air cleaner and duct assembly. Refer to 

EM-25, "Exploded View"

.

2. Remove the vacuum hose and vacuum piping.

INSTALLATION

Installation is in the reverse order of removal.

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

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

CAUTION:

Do not use lubricating oil during assembly.

- Face the paint mark of vacuum hose (intake manifold side) upward

to assemble.

- Face the other paint marks of vacuum hose to the vehicle front

side to assemble.

Inspection

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INSPECTION AFTER REMOVAL

Appearance

1.

Clamp

2.

Vacuum hose 

3.

Vacuum piping

A.

To brake booster

B.

Paint mark

C.

To intake manifold

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(A) : 24 mm (0.95 in) or more

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2014 Versa Sedan