Air INFINITI QX56 2010 Factory Service Manual

BR-6
< FUNCTION DIAGNOSIS >
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
FUNCTION DIAGNOSIS
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000005147889
Use the chart below to help you find the cause of the sy mptom. If necessary, repair or replace these parts.
×: ApplicableReference page
BR-7
, BR-9
BR-7
, BR-9
BR-7
, BR-9
BR-7
, BR-9
BR-7
, BR-9
BR-7
, BR-9
BR-7
, BR-9
BR-7
, BR-9
BR-7
, BR-9
BR-7
, BR-9
DLN-184, "
NVH Troubleshooting Chart
" (2F1310),
DLN-194, "
NVH Troubleshooting Chart
" (2S1410)
DLN-208, "
NVH Troubleshooting Chart
" (FFD),
DLN-242, "
NVH Troubleshooting Chart
" (RFD)
FAX-5, "
NVH Troubleshooting Chart
" (FAX),
RAX-5, "
NVH Troubleshooting Chart
" (RAX)
FSU-5, "
NVH Troubleshooting Chart
" (FSU),
RSU-5, "
NVH Troubleshooting Chart
" (RSU)
WT-43, "
NVH Troubleshooting Chart
"
ST-12, "
NVH Troubleshooting Chart
"
Possible cause and
SUSPECTED PARTS
Pads - damaged
Pads - uneven wear
Shims damaged
Rotor imbalance
Rotor damage
Rotor runout
Rotor deformation
Rotor deflection
Rotor rust
Rotor thickness variation
PROPELLER SHAFT
DIFFERENTIAL
DRIVESHAFT
SUSPENSION
TIRES AND ROAD WHEEL
STEERING
Symptom Noise
××× × × × × ××
Shake ×× ××××
Shimmy, Shudder ××××××× × × ××
Revision: April 20092010 QX56

FRONT DISC BRAKEBR-7
< BASIC INSPECTION >
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BASIC INSPECTION
FRONT DISC BRAKE
BRAKE PAD
BRAKE PAD : Front Pad InspectionINFOID:0000000005147890
PA D W E A R
Check pad thickness from the inspection holes on cylinder body.
Check using a scale if necessary.
DISC ROTOR
DISC ROTOR : Front Rotor InspectionINFOID:0000000005147891
VISUAL
Check surface of disc rotor for uneven wear, cracks, and serious damage. Replace as necessary.
RUNOUT
1. Attach disc rotor to wheel hub using wheel nuts (at two or more positions).
2. Inspect runout using a dial gauge placed at 10 mm (0.39 in) inside the disc edge.
NOTE:
Before measuring, make sure that wheel bearing axial end play
is within the specification. Refer to RAX-6, "
On-Vehicle Inspec-
tion and Service".
3. When runout exceeds limit value, displace mounting positions of disc rotor by one hole. And then find a position of the minimum value for runout.
4. If runout is outside the specified value after performing the above operation, turn disc rotor using Tool.
THICKNESS
Standard thickness : Refer to BR-46, "Front Disc
Brake".
Repair limit thickness : Refer to BR-46, "
Front Disc
Brake".
WFIA0522E
Runout limit : Refer to BR-46, "Front Disc
Brake".
(with it attached to the vehicle)
Tool number : 38-PFM90.5 ( — )
BRA0580D
Revision: April 20092010 QX56

BR-8
< BASIC INSPECTION >
FRONT DISC BRAKE
Check thickness of the disc rotor using a micrometer. Replace disc
rotor if thickness is less than the wear limit.Standard thickness : Refer to BR-46, "
Front
Disc Brake".
Repair limit thickness : Refer to BR-46, "
Front
Disc Brake".
Thickness variation
(Measured at 8 positions) : Refer to
BR-46, "
Front
Disc Brake".
SBR020B
Revision: April 20092010 QX56

REAR DISC BRAKEBR-9
< BASIC INSPECTION >
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REAR DISC BRAKE
BRAKE PAD
BRAKE PAD : Rear Pad InspectionINFOID:0000000005147892
PA D W E A R
Check pad thickness from the inspection holes on cylinder body.
Check using a scale if necessary.
DISC ROTOR
DISC ROTOR : Rear Rotor InspectionINFOID:0000000005147893
VISUAL
Check surface of disc rotor for uneven wear, cracks, and serious damage. Replace as necessary.
RUNOUT
1. Attach disc rotor to wheel hub using wheel nuts (at two or more positions).
2. Inspect runout using dial gauge placed at 10 mm (0.39 in) inside disc edge.
NOTE:
Before measuring, make sure that wheel bearing axial end play
is within the specification. Refer to RAX-6, "
On-Vehicle Inspec-
tion and Service".
3. When runout exceeds limit value, displace mounting positions of disc rotor by one hole. And then find a position of the minimum value for runout.
4. If runout is outside the specified value after performing the above operation, turn disc rotor using Tool.
THICKNESS
Check the thickness of the disc rotor using a micrometer. Replace
disc rotor if the thickness is less than the wear limit. Standard thickness : Refer to
BR-46, "
Rear Disc
Brake".
Repair limit thickness : Refer to BR-46, "
Rear Disc
Brake".
BRA0010D
Runout limit : Refer to BR-46, "Rear Disc Brake".
(With it attached to the vehicle)
Tool number : 38-PFM90.5 ( — )
BRA0697D
Standard thickness : Refer to BR-46, "Rear
Disc Brake".
Repair limit thickness : Refer to BR-46, "
Rear
Disc Brake".
Thickness variation
(Measured at 8 positions) : Refer to
BR-46, "
Rear
Disc Brake".
SFIA2284E
Revision: April 20092010 QX56

BR-10
< BASIC INSPECTION >
BRAKE BOOSTER
BRAKE BOOSTER
InspectionINFOID:0000000005147894
OPERATION
With engine stopped, change vacuum to atmospheric pressure by
depressing brake pedal several times. Then with brake pedal fully
depressed, start engine and when vacuum pressure reaches the
standard, make sure that clearance between brake pedal and floor
panel decreases.
AIR TIGHT
• Run engine at idle for approximately 1 minute, and stop it afterapplying vacuum to booster. Depress brake pedal normally to
change vacuum to atmospheric pressure. Make sure that distance
at intervals of 5 seconds between brake pedal and floor panel
gradually increases.
• Depress brake pedal while engine is running, and stop engine with pedal depressed. The pedal stroke should not change after holding pedal down for 30 seconds.
BRA0037D
SBR365AA
Revision: April 20092010 QX56

VACUUM LINESBR-11
< BASIC INSPECTION >
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VACUUM LINES
InspectionINFOID:0000000005147895
VISUAL INSPECTION
Check for improper assembly, damage and de terioration. Replace as necessary.
CHECK VALVE INSPECTION
Airtightness Inspection
Use a suitable tool to check. Connect to brake booster side of check
valve.
Check valve specification : Refer to BR-46, "
Check
Va l v e".
LFIA0217E
Revision: April 20092010 QX56

BRAKE FLUIDBR-17
< ON-VEHICLE MAINTENANCE >
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BRAKE FLUID
On Board InspectionINFOID:0000000005147901
LEVEL CHECK
• Make sure the fluid level in reservoir tank is between MAX and MIN lines as shown.
• Visually check around reservoir tank for fluid leaks.
• If fluid level is excessively low, check brake system for leaks.
• If brake warning lamp remains illuminated after parking brake pedal is released, check brake system for fluid leaks.
Drain and RefillINFOID:0000000005147902
CAUTION:
• Refill with new brake fluid. Refer to MA-13, "
Fluids and Lubricants".
• Do not reuse drained brake fluid.
• Do not let brake fluid splash on the painted surfaces of the body. This might damage the paint, so if
splashing it, immediately wipe off the area and wash away with water.
• Before servicing, disconnect ABS actuator and electri c unit (control unit) connector or battery nega-
tive terminal.
1. Connect a vinyl tube to each bleed valve.
2. Depress brake pedal, loosen each bleed valve, and gradually remove brake fluid.
3. Make sure there is no foreign material in reservoir tank, and refill with new brake fluid.
4. Rest foot on brake pedal. Loosen bleed valve. Slowly depress pedal until it stops. Tighten bleed valve. Release brake pedal.
Repeat this process a few times, then pause to add new brake
fluid to master cylinder. Continue until new brake fluid flows out
of the bleed valve.
Bleed the air out of the brake hydraulic system. Refer to BR-17,
"Bleeding Brake System".
Bleeding Brake SystemINFOID:0000000005147903
CAUTION:
While bleeding, pay attention to master cylinder fluid level.
1. Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector or battery
negative terminal.
2. Connect a vinyl tube to the rear right bleed valve.
LFIA0225E
SBR419C
SBR995
Revision: April 20092010 QX56

BR-18
< ON-VEHICLE MAINTENANCE >
BRAKE FLUID
3. Fully depress brake pedal 4 to 5 times.
4. With brake pedal depressed, loosen bleed valve to let the air out, and then tighten it immediately.
5. Repeat steps 3 and 4 until no more air comes out.
6. Tighten bleed valve to the specified torque. Refer to BR-31, "
Exploded View of Brake Caliper" (front disc
brake), BR-35, "
Exploded View of Brake Caliper" (rear disc brake).
7. Repeat steps 2 through 6 at each wheel, with master cylinder reservoir tank filled at least half way, bleed- ing air in order from the front left, rear left, and front right bleed valves.
Revision: April 20092010 QX56

BRAKE PEDALBR-19
< ON-VEHICLE REPAIR >
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ON-VEHICLE REPAIR
BRAKE PEDAL
Removal and InstallationINFOID:0000000005147904
REMOVAL
CAUTION:
• Before removal and installation, the accelerator and brake pedals must be in the forward most posi-
tion (closest to the floor). This is to align th e base position of the accelerator and brake pedals.
• Do not disassemble the brake pedal adjusting mechanism.
• Avoid damage from dropping the brake pedal assembly during handling.
• Keep the brake pedal assembly away from water.
1. Remove the lower instrument panel LH. Refer to IP-17, "
Removal and Installation".
2. Remove the stop lamp switch and ASCD cancel switch from the pedal assembly.
1. Brake pedal assembly 2. Clevis pin 3. Clip
4. Stop lamp switch 5. Pedal pad6. Snap pin
7. ASCD cancel switch
AWFIA0582GB
Revision: April 20092010 QX56

BR-20
< ON-VEHICLE REPAIR >
BRAKE PEDAL
3. Disconnect the adjustable brake pedal cable from the adjustablepedal electric motor.
• Unlock (1) then pull (2) the adjustable brake pedal cable to dis-connect it from the adjustable pedal electric motor as shown.
4. Remove snap pin and clevis pin from the clevis of brake booster.
5. Remove brake pedal assembly nuts and remove the brake pedal assembly. • Temporarily install the brake pedal assembly nuts by hand to support the brake booster.
WARNING:
Do not bend the brake tubing.
CAUTION:
• Before removal and installation, the accelerator and brake pedals must be in the forward mostposition (closest to the floor). This is to align the base position of the accelerator and brake ped-
als.
• Do not disassemble the brake pedal adjusting mechanism.
• Avoid damage from dropping th e brake pedal assembly during handling.
• Keep the brake pedal assembly away from water.
INSPECTION AFTER REMOVAL
Check the brake pedal assembly for the following items:
• Crack or deformation of clevis pin stopper
• Clevis pin deformation
• Crack of any welded portion of the brake pedal assembly
• Brake pedal bend or deformation
INSTALLATION
Installation is in the reverse order of removal.
• Check the brake pedal for smooth operation. Ther e should be no binding or sticking when applying or
releasing the brake pedal.
• Check the brake pedal adjustable feature for smooth operation. There should be no binding or sticking when adjusting the brake pedal forward or backward.
• After installing the brake pedal assembly, be sure to adjust it. Refer to BR-15, "
Inspection and Adjustment".
LBIA0374E
SBR997
Revision: April 20092010 QX56