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
4. Remove nuts on brake booster and brake pedal assembly. Refer
.
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
JSFIA1038GB
JPFIA0019ZZ
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
.
• 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
.
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
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
°
JPFIA0871ZZ
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
.
(A)
: Refer to
.
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2014 Versa Sedan
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
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
JSFIA0997ZZ
(A) : 24 mm (0.95 in) or more
JPFIA0023ZZ
2014 Versa Sedan
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