2011 INFINITI QX56 Factory Service Manual

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Page 497 of 5598

INFINITI QX56 2011 Factory Service Manual
BRAKE PIPINGBR-27
< REMOVAL AND INSTALLATION >
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2. Depress the brake pedal with a force of 785 N (80 kg, 176 lb) and hold down the pedal for approx. 5 sec- onds with th

Page 498 of 5598

INFINITI QX56 2011 Factory Service Manual
BR-28
< REMOVAL AND INSTALLATION >
HYDRAULIC BOOSTER ASSEMBLY
HYDRAULIC BOOSTER ASSEMBLY
Exploded ViewINFOID:0000000006222483
REMOVAL
DISASSEMBLY
1. Hydraulic booster assembly 2. Lock nut 3. Clevis
R

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INFINITI QX56 2011 Factory Service Manual
HYDRAULIC BOOSTER ASSEMBLYBR-29
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Removal and InstallationINFOID:0000000006222484
REMOVAL
1. Turn the ignition switch OFF. CAUTION:
Never tu

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INFINITI QX56 2011 Factory Service Manual
BR-30
< REMOVAL AND INSTALLATION >
HYDRAULIC BOOSTER ASSEMBLY
7. Remove snap pin (1) and clevis pin (2) from clevis.
8. Remove nuts on hydraulic booster assembly and brake pedalassembly.
CAUTION:
Hol

BR-30
< REMOVAL AND INSTALLATION >
HYDRAULIC BOOSTER ASSEMBLY
7. Remove snap pin (1) and clevis pin (2) from clevis.
8. Remove nuts on hydraulic booster assembly and brake pedalassembly.
CAUTION:
Hold the hydraulic booster assembly so as to avoid drop-
ping out.
9. Remove hydraulic booster assembly. CAUTION:
Always hold (A) when removi ng the hydraulic booster
assembly.
Never deform or bend the brake tubes when removing the hydraulic booster assembly.
Always use a cushion or an equivalent to place the hydraulic booster assembly. Failure to do this may cause
uneven loads or impact and result in a malfunction.
10. After replacing hydraulic booster assembly, always follow the accumulator disposal procedure to discard the hydraulic booster
assembly. Refer to BR-33, "
Disposal".
INSTALLATION
Note the following, and install in the reverse order of removal.
Perform adjustment before installation. Refer to BR-32, "
Inspection and Adjustment".
Never reuse a hydraulic booster assembly after an e xcessive impact. (Slight impulse caused during installa-
tion work is acceptable.)
Never turn the ignition switch ON before the completion of the installation procedure.
Be careful not to damage hydraulic booster assembly stud bolt threads. If hydraulic booster assembly is
tilted during installation, the dash panel may damage the threads.
Always hold (A) when removing the hydraulic booster assembly.
Never deform or bend the brake tubes when installing the hydraulic booster assembly.
Always use a new gasket between the hydraulic booster assembly, spacer and the dash panel.
Replace the clevis pin if it is damaged. Refer to BR-21, "
Inspection
and Adjustment".
Perform the air bleeding. Refer to BR-11, "
Bleeding Brake Sys-
tem".
Perform the brake pedal adjustment after installing the brake pedal assembly and hydraulic booster assembly. Refer to BR-7, "
Inspec-
tion and Adjustment".
Perform inspection after installation. Refer to BR-32, "
Inspection and Adjustment".
Disassembly and AssemblyINFOID:0000000006222485
DISASSEMBLY
CAUTION:
Disassemble the hydraulic booster assembly when necessary.
1. Remove gaskets and spacer from hydraulic booster assembly.
JPFIA0019ZZ
JPFIA0749ZZ
JPFIA0749ZZ
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
HYDRAULIC BOOSTER ASSEMBLYBR-31
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2. Remove the reservoir tank mounting pin with a pin punch (com- mercial service tool).
3. Remove bolt and

HYDRAULIC BOOSTER ASSEMBLYBR-31
< REMOVAL AND INSTALLATION >
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2. Remove the reservoir tank mounting pin with a pin punch (com- mercial service tool).
3. Remove bolt and remove the reservoir tank and grommets from the ABS actuator and electric unit (control unit).
CAUTION:
Never drop the removed parts. The parts must not be
reused if they are dropped.
4. Slide the clamp and remove brake hose assembly.
5. Remove the brake tube with a flare nut wrench. CAUTION:
Never scratch the flare nut and the brake tube.
6. Remove the cap with a suitable tool (A).
7. Remove grommets and screws ( ) and remove motor/accumu- lator assembly harness.
8. Cut harness band. CAUTION:
Never damage the harness.
9. Remove motor/accumulator assembly from ABS actuator and electric unit (control unit).
10. Remove bushings and collars from motor/accumulator assem- bly.
11. Remove brackets and bushing fr om ABS actuator and electric
unit (control unit).
12. Remove pin mount.
13. After replacing motor/accumulator assembly, always follow the accumulator disposal procedure to discard the motor/accumulator assembly. Refer to BR-33, "
Disposal".
ASSEMBLY
Note the following, and assembly in the reverse order of disassembly.
Never use mineral oils such as kerosene or gasoline and rubber grease during the cleaning and assembly
process.
Never drop the removed parts when installing. The parts must not be reused if they are dropped.
Never allow foreign matter (e.g. dust) and oils ot her than brake fluid to enter the reservoir tank.
For non reusable parts, refer to BR-28, "
Exploded View".
When connecting motor/accumulator assembly harness, check the order of harness colors.
Temporarily tighten the brake tube flare nut to the motor/accumula- tor assembly and ABS actuator and electric unit (control unit) by
hand. Then tighten it to the specified torque with a crowfoot and
torque wrench.
CAUTION:
Never scratch the flare nut and the brake tube.
JPFIA0750ZZ
JPFIA0752ZZ
JPFIA0751ZZ
A: Black
B: Red
JPFIA0753ZZ
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
BR-32
< REMOVAL AND INSTALLATION >
HYDRAULIC BOOSTER ASSEMBLY
Apply new brake fluid to grommet of between reservoir tank and grommet and ABS actuator and electric unit
(control unit).
Inspection an

BR-32
< REMOVAL AND INSTALLATION >
HYDRAULIC BOOSTER ASSEMBLY
Apply new brake fluid to grommet of between reservoir tank and grommet and ABS actuator and electric unit
(control unit).
Inspection and AdjustmentINFOID:0000000006222486
ADJUSTMENT BEFORE INSTALLATION
Input Rod Length adjustment
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 Check
1. Turn the ignition switch OFF.
2. Depress the brake pedal 20 times or more. NOTE:
The pressure loss in the accumulator results in a large brake pedal stroke. In addition to this, the brake
pedal depression becomes lighter in initial stage.
3. Check that the fluid level in the reservoir tank is MAX line.
4. Position the selector lever in P range to release the parking brake.
5. Turn the ignition switch ON to check the time between motor activation and motor stop.
6. After the motor is stopped, check that the ABS warn ing lamp and the VDC warning lamp in the combina-
tion meter are OFF when the engine is started.
7. Stop the engine (ignition switch OFF).
8. Turn the ignition switch ON and depress the brake pedal 4 to 5 times to check the time between motor activation and motor stop.
9. Turn the ignition switch OFF. Turn the ignition swit ch ON again. Check that the VDC warning lamp turns
ON when the brake pedal is depressed 15 to 20 times.
10. Check that the VDC warning lamp turns ON when the brake pedal is depressed 15 to 20 times after the lapse of 120 seconds or more after the ignition switch is turned ON again.
11. Perform the self-diagnosis for “ABS” with CONSULT- III and erase all the stored self-diagnosis results.
Function Check
1. Turn the ignition switch OFF.
2. Depress the brake pedal 20 times or more.
NOTE:
The pressure loss in the accumulator results in a large brake pedal stroke. In addition to this, the brake
pedal depression becomes lighter in initial stage.
3. Turn the ignition switch ON with the brake pedal depr essed to check that the clearance between the brake
pedal and the dash lower panel decreases. A : Refer to
BR-47, "
Brake Booster".
JPFIA0728ZZ
Motor operating time : 18 seconds or less
Motor operating time : 2 − 11 seconds
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
HYDRAULIC BOOSTER ASSEMBLYBR-33
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DisposalINFOID:0000000006222487
1. Remove accumulator (2) from motor/accumulator assembly (1).
2. Fix the

Page 504 of 5598

INFINITI QX56 2011 Factory Service Manual
BR-34
< REMOVAL AND INSTALLATION >
FRONT DISC BRAKE
FRONT DISC BRAKE
BRAKE PAD
BRAKE PAD : Exploded ViewINFOID:0000000006222488
BRAKE PAD : Removal and InstallationINFOID:0000000006222489
REMOVAL
WAR

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