Infiniti G37 Coupe. Manual — part 249
BR-34
< ON-VEHICLE REPAIR >
BRAKE BOOSTER
• 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 dash panel.
• Replace the clevis pin if it is damaged. Refer to
BR-20, "Inspection and Adjustment"
• Install the brake pedal assembly and brake booster mounting nuts, and tighten it to the specified
torque.
• After installation, perform the air bleeding. Refer to
BR-12, "Bleeding Brake System"
.
CAUTION:
Never reuse drained brake fluid.
Inspection and Adjustment
INFOID:0000000001647860
INSPECTION AFTER REMOVAL
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
• Run the engine at idle for 1 minute to apply vacuum to the brake
booster, and stop the engine. Then depress the brake pedal sev-
eral 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 when perform-
ing this operation.
Standard
Input rod length (B)
: Refer to
JPFIA0020ZZ
BRA0037D
JPFIA0043ZZ
BRAKE BOOSTER
BR-35
< ON-VEHICLE REPAIR >
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• 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
.
JPFIA0044ZZ
BR-36
< ON-VEHICLE REPAIR >
BRAKE BOOSTER PRESSURE SENSOR
BRAKE BOOSTER PRESSURE SENSOR
Exploded View
INFOID:0000000001706100
Removal and Installation
INFOID:0000000001706101
REMOVAL
1.
Remove master cylinder cover.
2.
Remove brake booster pressure sensor.
3.
Remove vacuum hose.
INSTALLATION
Note the following, installation is the reverse order of removal.
CAUTION:
• Insert vacuum hose at least 25 mm (0.98 in) (A).
• Never use lubricating oil during assembly.
• Face the marking side vehicle front when assembling (brake
booster side).
• Face the marking side connector when assembling (brake
booster pressure sensor side).
Inspection
INFOID:0000000001706102
INSPECTION AFTER REMOVAL
• Check for correct assembly, damage and deterioration.
• Check for brake booster pressure sensor. Refer to
EC-352, "Component Inspection"
1.
Brake booster
2.
Clamp
3.
Vacuum hose
4.
Brake booster pressure sensor
A.
Paint mark
Refer to
for symbols in the figure.
JPFIA0240GB
JPFIA0023ZZ
VACUUM LINES
BR-37
< ON-VEHICLE REPAIR >
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VACUUM LINES
Exploded View
INFOID:0000000001647861
Removal and Installation
INFOID:0000000001647862
REMOVAL
1.
Remove the engine cover. Refer to
2.
Remove the cowl top. Refer to
.
3.
Remove the vacuum hose and tube.
INSTALLATION
Installation is the reverse order of removal.
CAUTION:
• 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.
• Insert vacuum hose at least 24 mm (0.94 in) (A).
• Never use lubricating oil during assembly.
• Face the marking side up when assembling.
Inspection
INFOID:0000000001647863
INSPECTION AFTER REMOVAL
Appearance
Check for correct assembly, damage and deterioration.
Check Valve Airtightness
1.
Grommet
2.
Clamp
3.
Vacuum hose (built in check valve)
4.
Vacuum piping
5.
Vacuum hose
A.
To intake manifold
B.
Paint mark
C.
Stamp indicating engine direction
D.
Stamp indicating grommet installa-
tion position
E.
To brake booster
JPFIA0022ZZ
JPFIA0023ZZ
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