Nissan Murano Z51. Manual — part 290
BRAKE BOOSTER
BR-31
< REMOVAL AND INSTALLATION >
C
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A
B
BR
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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
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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
.
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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
.
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VACUUM LINES
BR-33
< REMOVAL AND INSTALLATION >
C
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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.
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