INFINITI QX56 2011 Factory Service Manual

BR-1
BRAKES
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SECTION BR
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CONTENTS
BRAKE SYSTEM
PRECAUTION ................ ...............................3
PRECAUTIONS .............................................. .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
3
Precaution for Procedure without Cowl Top Cover ......4
Precaution for Brake system .....................................4
PREPARATION ............................................5
PREPARATION .............................................. .....5
Commercial Service Tools .................................. ......5
SYMPTOM DIAGNOSIS ...............................6
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ........................ .....
6
NVH Troubleshooting Chart ................................ ......6
PERIODIC MAINTENANCE ..........................7
BRAKE PEDAL .............................................. .....7
Inspection and Adjustment .................................. ......7
BRAKE FLUID ....................................................10
Inspection ............................................................ ....10
Draining ...................................................................10
Refilling ...................................................................11
Bleeding Brake System ...........................................11
HYDRAULIC BOOSTER ASSEMBLY ...............15
Inspection ............................................................ ....15
FRONT DISC BRAKE .................................... ....16
BRAKE PAD .......................................................... ....16
BRAKE PAD : Inspection and Adjustment ..............16
DISC ROTOR ......................................................... ....16
DISC ROTOR : Inspection and Adjustment ............16
REAR DISC BRAKE .........................................18
BRAKE PAD .......................................................... ....18
BRAKE PAD : Inspection and Adjustment ...............18
DISC ROTOR ......................................................... ....18
DISC ROTOR : Inspection and Adjustment .............18
REMOVAL AND INSTALLATION ...............20
BRAKE PEDAL ................................ .................20
Exploded View ..................................................... ....20
Removal and Installation .........................................20
Inspection and Adjustment ......................................21
BRAKE PIPING ................................ .................22
FRONT ................................................................... ....22
FRONT : Exploded View .........................................22
FRONT : Hydraulic Piping .......................................23
FRONT : Removal and Installation ..........................23
FRONT : Inspection .................................................24
REAR ..................................................................... ....24
REAR : Exploded View ............................................25
REAR : Hydraulic Piping ..........................................25
REAR : Removal and Installation ............................26
REAR : Inspection ...................................................26
HYDRAULIC BOOSTER ASSEMBLY ..............28
Exploded View .........................................................28
Removal and Installation .........................................29
Disassembly and Assembly .....................................30
Inspection and Adjustment ......................................32
Disposal ...................................................................33
FRONT DISC BRAKE .......................................34
BRAKE PAD .......................................................... ....34
BRAKE PAD : Exploded View .................................34
BRAKE PAD : Removal and Installation ..................34
BRAKE PAD : Inspection . ........................................36
Revision: 2010 May2011 QX56

BR-2
BRAKE CALIPER ASSEMBLY ................................36
BRAKE CALIPER ASSEMBLY : Exploded View ....36
BRAKE CALIPER ASSEMBLY : Removal and In-
stallation .................................................................
37
BRAKE CALIPER ASSEMBLY : Disassembly and
Assembly ................................................................
38
BRAKE CALIPER ASSEMBLY : Inspection ...........39
REAR DISC BRAKE ..........................................41
BRAKE PAD .......................................................... ...41
BRAKE PAD : Exploded View ................................41
BRAKE PAD : Removal and Installation .................41
BRAKE PAD : Inspection ........................................42
BRAKE CALIPER ASSEMBLY ............................. ...42
BRAKE CALIPER ASSEMBLY : Exploded View ....42
BRAKE CALIPER ASSEMBLY : Removal and In-
stallation ............................................................... ...
43
BRAKE CALIPER ASSEMBLY : Disassembly and
Assembly ................................................................
44
BRAKE CALIPER ASSEMBLY : Inspection ............45
SERVICE DATA AND SPECIFICATIONS
(SDS) .......... ................................................
47
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ...
47
General Specification ........................................... ...47
Brake Pedal ............................................................47
Brake Booster .........................................................47
Front Disc Brake .....................................................47
Rear Disc Brake ......................................................47
Revision: 2010 May2011 QX56

PRECAUTIONSBR-3
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006228171
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision that would result in air ba g inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.
 When using air or electric power tools or hammers , always switch the ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
Precaution Necessary for Steering Wh eel Rotation after Battery Disconnect
INFOID:0000000006228172
NOTE:
 Before removing and installing any control units, first tu rn the push-button ignition switch to the LOCK posi-
tion, then disconnect both battery cables.
 After finishing work, confirm that all control unit connectors are connected properly, then re-connect both
battery cables.
 Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If a DTC is detected, perform trouble diagnos is according to self-diagnosis results.
For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
If turning the steering wheel is required with the batte ry disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Turn the push-button ignition switch to ACC position. (At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock wil l remain released with both battery cables discon-
nected and the steering wheel can be turned.
4. Perform the necessary repair operation.
Revision: 2010 May2011 QX56

BR-4
< PRECAUTION >
PRECAUTIONS
5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button igniti on switch is turned to LOCK position.)
6. Perform self-diagnosis check of all control units using CONSULT-III.
Precaution for Procedure without Cowl Top CoverINFOID:0000000006228173
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
Precaution for Brake systemINFOID:0000000006222459
WARNING:
Clean any dust from the front brake and rear brake wi th a vacuum dust collector. Never blow with com-
pressed air.
 Brake fluid use refer to MA-10, "
Fluids and Lubricants".
 Never reuse drained brake fluid.
 Never 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.
 Always confirm the specified tightening torque when installing the brake pipes.
 After pressing the brake pedal more deeply or harder t han normal driving, such as air bleeding, check each
item of brake pedal. Adjust brake pedal if it is outside the standard value.
 Always clean with new brake fluid when cleaning the brake caliper and other components.
 Never use mineral oils such as gasoline or light oil to clean. They may damage rubber parts and cause
improper operation.
 Always loosen the brake tube flar e nut with a flare nut wrench.
 Tighten the brake tube flare nut to the specified torque with a crow-
foot (A) and torque wrench (B).
 Brake system is an important safety part. If a brake fluid leak is detected, always disassemble the affected part. If a malfunction is
detected, replace part with a new one.
 Always connect the battery terminals when moving the vehicle.
 Turn the ignition switch OFF and disconnect the hydraulic booster assembly harness connector or the battery negative terminal
before performing the work.
 Check that no brake fluid leakage is present after replacing the
parts.
 Burnish the brake contact surfaces after refinishing or replacing rotors, after replacing pads, or if a soft pedal occurs at very low mileage.
- Front brake pad: Refer to BR-16, "
BRAKE PAD : Inspection and Adjustment".
- Front disc rotor: Refer to BR-16, "
DISC ROTOR : Inspection and Adjustment".
- Rear brake pad: refer to BR-18, "
BRAKE PAD : Inspection and Adjustment".
- Rear disc rotor: BR-18, "
DISC ROTOR : Inspection and Adjustment".
PIIB3706J
JPFIA0001ZZ
Revision: 2010 May2011 QX56

PREPARATIONBR-5
< PREPARATION >
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PREPARATION
PREPARATION
Commercial Service ToolsINFOID:0000000006222460
Tool name Description
Power tool Loosening bolts and nuts
Pin punch
a: 4 mm (0.16 in) Removing and installing reservoir tank
Brake caliper wrench Return the piston
PBIC0190E
NT410
NNFIA0040ZZ
Revision: 2010 May2011 QX56

BR-6
< SYMPTOM DIAGNOSIS >
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
SYMPTOM DIAGNOSIS
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000006222461
Use the chart below to find the cause of the symp tom. If necessary, repair or replace these parts.
×: ApplicableReference page
BR-16
,
BR-18
BR-16
, BR-18
BR-36
, BR-42
BR-16
, BR-18
BR-16
, BR-18
BR-16
, BR-18
BR-16
, BR-18
BR-16
, BR-18
BR-16
, BR-18
BR-16
, BR-18
NVH in PB section
NVH in DLN section
NHV in DLN section
NVH in FAX, RAX and FSU, RSU section
NVH in WT section
NVH in WT section
NVH in FAX, RAX section
NVH in ST section
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
Drum out of round
PROPELLER SHAFT
DIFFERENTIAL
AXLE AND SUSPENSION
TIRE
ROAD WHEEL
DRIVE SHAFT
STEERING
Symptom BRAKE Noise
××× ×× ×××
××
Shake ×××××
××
Shimmy, Judder ××××××× ××× ×
Revision: 2010 May2011 QX56

BRAKE PEDALBR-7
< PERIODIC MAINTENANCE >
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PERIODIC MAINTENANCE
BRAKE PEDAL
Inspection and AdjustmentINFOID:0000000006222462
INSPECTION
Brake Pedal Height
Check the brake pedal height (H1) between the dash lower panel (1)
and the brake pedal upper surface.
CAUTION:
Perform it with the floor trim removed.
Stop Lamp Switch and Brake Switch
Check the clearance (C) between the brake pedal bracket (1) and
the stop lamp switch and brake switch (2) threaded end.
CAUTION:
The stop lamp must turn off when the brake pedal is released.
NOTE:
Pull the brake pedal pad to make the clearance between the stop
lamp switch and brake switch threaded end and the brake pedal
bracket.
Brake Pedal Play
Press the brake pedal. Check the brake pedal play (A) (stroke until
fluid pressure occurs).
Depressed Brake Pedal Height
Check the height between the dash lower panel (1) and the top face
of the brake pedal (H
2) when depressing the brake pedal with a force
of 490 N (50 kg, 110 lb) while the engine is running.
CAUTION:
Perform it with the floor trim removed.
ADJUSTMENT
H1: Refer to BR-47, "Brake Pedal".
JPFIA0065ZZ
C : Refer to BR-47, "Brake Pedal".
JPFIA0674ZZ
A : Refer to BR-47, "Brake Pedal".
JPFIA0277ZZ
H2: Refer to BR-47, "Brake Pedal".
JPFIA0068ZZ
Revision: 2010 May2011 QX56

BR-8
< PERIODIC MAINTENANCE >
BRAKE PEDAL
Brake Pedal Height
1. Remove instrument lower panel LH. Refer to IP-14, "Removal and Installation".
2. Disconnect the stop lamp switch harness c onnector and the brake switch harness connector.
3. Loosen the stop lamp switch and brake switch by turning it 45 ° counterclockwise.
4. Loosen the input rod lock nut (1).
5. Rotate the input rod (2), and adjust the brake pedal to the speci- fied height.
CAUTION:
 Perform it with the floor trim removed.
 The threaded end of the in put rod must project to the
inner side of the clevis (3).
6. Tighten the lock nut. Refer to BR-28, "
Exploded View".
7. Adjust the clearance between the brake pedal bracket and the stop lamp switch and brake switch threaded end after adjusting
the brake pedal height.
Stop Lamp Switch and Brake Switch
1. Remove instrument lower panel LH. Refer to IP-14, "Removal and Installation".
2. Disconnect the stop lamp switch harness c onnector and the brake switch harness connector.
3. Loosen the stop lamp switch and brake switch by turning it 45 ° counterclockwise.
4. Press-fit the stop lamp switch and brake switch (2) until the stop
lamp switch and brake switch hits the brake pedal bracket (1)
45 ° clockwise while pulling the brake pedal pad slightly.
CAUTION:
 The clearance (C) between the brake pedal bracket and
stop lamp switch and brake switch threaded end and
must be the specified value.
 The stop lamp must turn off when the brake pedal is released.
Brake Pedal Play
1. Remove instrument lower panel LH. Refer to IP-14, "Removal and Installation".
2. Disconnect the stop lamp switch harness c onnector and the brake switch harness connector.
3. Loosen the stop lamp switch and brake switch by turning it 45 ° counterclockwise.
JPFIA0662ZZ
H1: Refer to BR-47, "Brake Pedal".
JPFIA0279ZZ
C : Refer to BR-47, "Brake Pedal".
JPFIA0674ZZ
Revision: 2010 May2011 QX56

BRAKE PEDALBR-9
< PERIODIC MAINTENANCE >
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4. Press-fit the stop lamp switch and brake switch (2) until the stop
lamp switch and brake switch hits the brake pedal bracket (1)
45 ° clockwise while pulling the brake pedal pad slightly.
CAUTION:
 The clearance (C) between the brake pedal bracket and stop lamp switch and brake switch threaded end and
must be the specified value.
 The stop lamp must turn off when the brake pedal is released.
Depressed Brake Pedal Height
1. Perform the air bleeding. Refer to BR-11, "Bleeding Brake System".
2. Check the height between the dash lower panel (1) and the top face of the brake pedal (H
2) when depressing the brake pedal
with a force of 490 N (50 kg, 110 lb) while the engine is running.
CAUTION:
Perform it with the floor trim removed.
3. Adjust the brake pedal play after adjusting the brake pedal height, clearance between the brake pedal bracket and the stop
lamp switch and brake switch threaded end.C : Refer to
BR-47, "
Brake Pedal".
JPFIA0674ZZ
H2: Refer to BR-47, "Brake Pedal".
JPFIA0068ZZ
Revision: 2010 May2011 QX56

BR-10
< PERIODIC MAINTENANCE >
BRAKE FLUID
BRAKE FLUID
InspectionINFOID:0000000006222463
BRAKE FLUID LEVEL
 Check that the fluid level in the reservoir tank is within the specified range (MAX – MIN lines).
CAUTION:
Turn OFF the ignition switch an d depress the brake pedal 20 times or more to check brake fluid level.
NOTE:
Since brake fluid is in the accumulator in pressurized condition, the reservoir tank brake fluid level should be
lower than the MAX line.
 Visually check for any brake fluid leakage around the reservoir tank.
 Check the brake system for any leakage if the fl uid level is extremely low (lower than MIN).
 Check the brake system for fluid leakage if the warn ing lamp remains illuminated even after the parking
brake is released.
 Check the reservoir tank for the mixing of foreign matter (e.g. dust) and oils other than brake fluid.
BRAKE LINE
1. Check brake line (tubes and hoses) for cracks, deterioration or other damage. Replace any damaged
parts.
2. Depress the brake pedal with a force of 490 N (50 kg, 110 lb) and hold down the pedal for approx. 5 seconds with the engine
running. Check for any fluid leakage.
CAUTION:
Retighten the applicable conn ection to the specified torque
and repair any abnormal (damag ed, worn or deformed) part
if any brake fluid leakage is present.
DrainingINFOID:0000000006222464
FRONT BRAKE
CAUTION:
 If the brake fluid adheres to the brake caliper assembly and disc rotor, quickly wipe it off.
 Never spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it
off immediately and wash with wate r if it gets on a painted surface.
 Never operate the brake pedal with the reservoir cap removed. Failure to do this may cause the scat-
tering of brake fluid.
 Never operate the brake pedal excessively during the work procedure.
1. Turn the ignition switch ON.
2. Connect a vinyl tube to the bleed valve.
3. Depress the brake pedal and loosen the bleeder valve.
4. Depress the brake pedal several time gradually discharge brake fluid.
REAR BRAKE
CAUTION:
 If the brake fluid adheres to the brake caliper assembly and disc rotor, quickly wipe it off.
 Never spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it
off immediately and wash with wate r if it gets on a painted surface.
 Never operate the brake pedal with the reservoir cap removed. Failure to do this may cause the scat- tering of brake fluid.
 Never operate the brake pedal excessively during the work procedure.
1. Turn the ignition switch ON.
2. Connect a vinyl tube to the bleed valve.
3. Depress the brake pedal and loosen the bleeder valve to gradually discharge brake fluid.
SBR389C
Revision: 2010 May2011 QX56