brake fluid INFINITI QX56 2011 Factory Owner's Manual

REAR DISC BRAKEBR-41
< REMOVAL AND INSTALLATION >
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REAR DISC BRAKE
BRAKE PAD
BRAKE PAD : Exploded ViewINFOID:0000000006222495
BRAKE PAD : Removal and InstallationINFOID:0000000006222496
REMOVAL
WARNING:
Clean any dust from the brake caliper assembly an d brake pads with a vacuum dust collector. Never
blow with compressed air.
CAUTION:
 Never depress the brake pedal while removing th e brake pads because the piston may pop out.
 If the brake fluid or grease adheres to the brake cal iper assembly and disc rotor, quickly wipe it off.
1. Remove tires with power tool.
2. Remove upper sliding pin bolt.
3. Suspend the cylinder body with suitable wire so that the brake hose will not stretch. Then remove the
brake pads from the torque member.
CAUTION:
 Never deform the pad retainer when removing the pad retainer from the torque member.
 Never damage the piston boot.
 Never drop the brake pads and shims.
 Remember each position of the removed brake pads.
4. Perform inspection after removal. Refer to BR-42, "
BRAKE PAD : Inspection".
INSTALLATION
WARNING:
Clean any dust from the brake caliper assembly an d brake pads with a vacuum dust collector. Never
blow with compressed air.
CAUTION:
 Never depress the brake pedal while removing th e brake pads because the piston may pop out.
 If the brake fluid or grease adheres to the brake cal iper assembly and disc rotor, quickly wipe it off.
1. Cylinder body 2. Inner shim 3. Inner pad (with pad wear sensor)
4. Pad retaining 5. Torque member 6. Outer pad
7. Outer shim
: Apply PBC (Poly Butyl Cuprysil) grease or silicone-based grease.
Refer to GI-4, "
Components" for symbols not described on the above.
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Revision: 2010 May2011 QX56

BR-42
< REMOVAL AND INSTALLATION >
REAR DISC BRAKE
1. Install the torque member if the pad retainers has been removed.CAUTION:
 Securely assemble the pad retainers so that it wi ll not be lifted up from the torque member.
 Never deform the pad retainers.
2. Apply PCB (Poly Butyl Cuprysil) grease or silicone-based grease to the matching faces (A) between the brake pad and
shim, and install the shims to brake pads.
CAUTION:
Always replace the shims when replacing the brake pad.
3. Apply PCB (Poly Butyl Cuprysil) grease or silicone-based grease to the matching faces (B) between the brake pad and
torque member.
4. Install cylinder body to the torque member. CAUTION:
 Never damage the piston boot.
 When replacing brake pad with new one, check a brakefluid level in the reservoir tank because brake flui d returns to reservoir tank when pressing pis-
ton in.
NOTE:
Use a disc brake piston tool to easily press piston.
5. Install the upper sliding pin bolt and tighten it to the specified torque.
6. Depress the brake pedal several times to check that no drag feel is present for the front disc brake. Refer
to BR-42, "
BRAKE PAD : Inspection".
7. Install tires with power tool. Refer to WT-64, "
Exploded View".
BRAKE PAD : InspectionINFOID:0000000006222497
INSPECTION AFTER REMOVAL
 Replace the shims if rust is excessively attached.
 Eliminate rust on the pad retainers and the torque mem ber. Replace them if rust is excessively attached.
INSPECTION AFTER INSTALLATION
1. Check a drag of rear disc brake. If any drag is found, follow the procedure described below.
2. Remove brake pads. Refer to BR-41, "
BRAKE PAD : Removal and Installation".
3. Press the piston. Refer to BR-41, "
BRAKE PAD : Removal and Installation".
4. Install brake pads. Refer to BR-41, "
BRAKE PAD : Removal and Installation".
5. Depress the brake pedal several times.
6. Check a drag of rear disc brake again. If any drag is found, disassemble the caliper. Refer to BR-44,
"BRAKE CALIPER ASSEMBLY : Disassembly and Assembly".
7. Burnish contact surfaces brake pads and disc rotor after refinishing or replacing brake pads, or if a soft pedal occurs at very low mileage. Refer to BR-18, "
BRAKE PAD : Inspection and Adjustment".
BRAKE CALIPER ASSEMBLY
BRAKE CALIPER ASSEMBLY : Exploded ViewINFOID:0000000006222498
REMOVAL
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Revision: 2010 May2011 QX56

REAR DISC BRAKEBR-43
< REMOVAL AND INSTALLATION >
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DISASSEMBLY
BRAKE CALIPER ASSEMBLY : Removal and InstallationINFOID:0000000006222499
REMOVAL
WARNING:
Clean any dust from the brake caliper assembly an d brake pads with a vacuum dust collector. Never
blow with compressed air.
1. Brake caliper assembly
Refer to GI-4, "
Components" for symbols in the figure.
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1. Cap 2. Bleeder valve 3. Cylinder body
4. Piston seal 5. Piston 6. Piston boot
7. Sliding pin 8. Bushing 9. Sliding pin boot
10. Torque member
: Apply rubber grease.
: Apply brake fluid
Refer to GI-4, "
Components" for symbols not described on the above.
JPFIA0736GB
Revision: 2010 May2011 QX56

BR-44
< REMOVAL AND INSTALLATION >
REAR DISC BRAKE
CAUTION:
 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 depress the brake pedal. Brake fluid may splash while removing the brake hose.
 If the brake fluid or grease adheres to the brake calip er assembly and disc rotor, quickly wipe it off.
1. Remove tires with power tool.
2. Fix the disc rotor using wheel nuts.
3. Drain brake fluid. Refer to BR-10, "
Draining".
4. Separate brake hose from brake caliper assembly. Refer to BR-26, "
REAR : Removal and Installation".
5. Remove torque member mounting bolts, and remove brake caliper assembly. CAUTION:
Never drop brake pad and caliper assembly.
6. Remove disc rotor. Refer to RAX-7, "
Removal and Installation".
INSTALLATION
WARNING:
Clean any dust from the brake caliper assembly an d brake pads with a vacuum dust collector. Never
blow with compressed air.
CAUTION:
 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 depress the brake pedal. Brake fluid may splash while removing the brake hose.
 If the brake fluid or grease adheres to the brake calip er assembly and disc rotor, quickly wipe it off.
1. Install disc rotor. Refer to RAX-7, "
Removal and Installation".
2. Install the brake caliper assembly to the axle hous ing and tighten the torque member mounting bolts to the
specified torque.
CAUTION:
Never spill or splash any grease and moisture on the brake caliper assembly mounting face,
threads, mounting bolts. Wipe out any grease and moisture.
3. Install brake hose to brake caliper assembly. Refer to BR-26, "
REAR : Removal and Installation".
4. Perform the air bleeding. Refer to BR-11, "
Bleeding Brake System".
5. Check a drag of rear disc brake. If any drag is found, refer to BR-45, "
BRAKE CALIPER ASSEMBLY :
Inspection".
6. Install tires with power tool. Refer to WT-64, "
Exploded View".
BRAKE CALIPER ASSEMBLY : Disassembly and AssemblyINFOID:0000000006222500
DISASSEMBLY
NOTE:
Never remove the torque member, brake pads and pad retainers when disassembling and assembling the cyl-
inder body.
1. Remove the sliding pin bolt, and remove the cylinder body from the torque member.
CAUTION:
Fix the brake pad at suitable tape so that the brake pad will not drop.
2. Remove sliding pin boots from torque member.
3. Remove bushing from sliding pin bolt.
4. Place a wooden block as shown in the figure, and blow air from brake hose mounting hole to remove piston and piston boot.
CAUTION:
Never get fingers caught in the piston.
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Revision: 2010 May2011 QX56

REAR DISC BRAKEBR-45
< REMOVAL AND INSTALLATION >
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5. Remove piston seal from cylinder body using suitable tool. CAUTION:
Be careful not to damage a cylinder inner wall.
6. Remove bleeder valve and cap.
7. Perform inspection after disassembly. Refer to BR-45, "
BRAKE
CALIPER ASSEMBLY : Inspection".
ASSEMBLY
1. Install bleeder valve and cap.
2. Apply rubber grease to piston seal (1), and install them to cylin-
der body.
CAUTION:
Never reuse piston seal.
3. Apply rubber grease to piston boot (1). Cover the piston (2) end with piston boot, and then install cylinder side lip on piston boot
securely into a groove on cylinder body.
CAUTION:
Never reuse piston boot.
4. Apply new brake fluid to piston (1). Push piston into cylinder body by hand and push piston boot (2) piston-side lip into the
piston groove.
CAUTION:
Press the piston evenly and var y the pressing point to pre-
vent cylinder inner wall from being rubbed.
5. Apply rubber grease to bushing, and install bushing to sliding pin bolt.
6. Apply rubber grease to sliding pin boots, and install sliding pin boots to torque member.
7. Apply rubber grease to sliding pin, and install the cylinder body.
8. Install sliding pin bolts and tighten it to the specified torque.Refer to BR-42, "
BRAKE CALIPER ASSEM-
BLY : Exploded View".
BRAKE CALIPER ASSEMBLY : InspectionINFOID:0000000006222501
INSPECTION AFTER DISASSEMBLY
Check the following items and replace if necessary.
Cylinder Body
Check the cylinder inner wall for rust, wear, cracks or damage.
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Revision: 2010 May2011 QX56

BR-46
< REMOVAL AND INSTALLATION >
REAR DISC BRAKE
CAUTION:
Always clean with new brake fluid. Never clean with mineral oil such as gasoline and light oil.
Torque Member
Check the torque member for rust, wear, cracks or damage.
Piston
Check the surface of the piston for rust, wear, cracks or damage.
CAUTION:
A piston sliding surface is plat ed. Never polish with sandpaper.
Sliding Pin, Sliding Pin Boot and Bushing
Check the sliding pins, sliding pin boots and bushing for rust, wear, cracks or damage.
INSPECTION AFTER INSTALLATION
1. Check a drag of rear disc brake. If any dr ag is found, follow the procedure described below.
2. Remove brake pads. Refer to BR-41, "
BRAKE PAD : Removal and Installation".
3. Press the piston. Refer to BR-41, "
BRAKE PAD : Removal and Installation".
4. Install brake pads. Refer to BR-41, "
BRAKE PAD : Removal and Installation".
5. Depress the brake pedal several times.
6. Check a drag of rear disc brake again. If any drag is found, disassemble the caliper. Refer to BR-44,
"BRAKE CALIPER ASSEMBLY : Disassembly and Assembly".
7. Burnish contact surfaces brake pads and disc rotor after refinishing or replacing disc rotor, or if a soft pedal occurs at very low mileage. Refer to BR-18, "
DISC ROTOR : Inspection and Adjustment".
Revision: 2010 May2011 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)
BR-47
< SERVICE DATA AND SPECIFICATIONS (SDS)
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SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
General SpecificationINFOID:0000000006222502
Unit: mm (in)
Brake PedalINFOID:0000000006222503
Unit: mm (in)
Brake BoosterINFOID:0000000006222504
Unit: mm (in)
Front Disc BrakeINFOID:0000000006222505
Unit: mm (in)
Rear Disc BrakeINFOID:0000000006222506
Unit: mm (in)
Front brake Cylinder bore diameter 50.8 (2.000)
× 2
Pad length × width × thickness 151.6 (5.97) × 56.5 (2.224) × 12.0 (0.472)
Rotor outer diameter × thickness 350 (13.78) × 30.0 (1.181)
Rear brake Cylinder bore diameter 48.1 (10894)
Pad length
× width × thickness 110.0 (4.43) × 41.0 (1.614) × 9.0 (0.354)
Rotor outer diameter × thickness 350 (13.78) × 20.0 (0.787)
Control valve Valve type Electric brake force distribution
Recommended brake fluid Refer to MA-10, "
Fluids and Lubricants".
Item Standard
Brake pedal height 168.5 (6.63) – 178.5 (7.03)
Depressed brake pedal height
[Depressing 490 N (50 kg, 110 lb) while turning the engine ON] 100 (3.94) or more
Clearance between stop lamp switch and brake switch threaded end and the
brake pedal bracket 0.2 (0.008) – 1.96 (0.0772)
Brake pedal play 3 (0.12) – 11 (0.43)
Item Standard
Input rod length 202.2 (7.96)
Item Limit
Brake pad Wear thickness 1.5 (0.059)
Disc rotor Wear thickness 28.5 (1.122)
Thickness variation (measured at 8 positions) 0.015 (0.0006)
Runout (with it attached to the vehicle) 0.053 (0.0021)
Item Limit
Brake pad Wear thickness 2.0 (0.079)
Disc rotor Wear thickness 18.0 (0.709)
Thickness variation (measured at 8 positions) 0.015 (0.0006)
Runout (with it attached to the vehicle) 0.05 (0.0020)
Revision: 2010 May2011 QX56

BRC-1
BRAKES
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SECTION BRC
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CONTENTS
BRAKE CONTROL SYSTEM
WITH VDC
PRECAUTION ................ ...............................
5
PRECAUTIONS .............................................. .....5
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
5
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
5
Precaution for Procedure without Cowl Top Cover ......6
Precaution for Brake System ....................................6
Precaution for Brake Control System ........................6
Precaution for Harness Repair ..................................7
PREPARATION ............................................9
PREPARATION .............................................. .....9
Commercial Service Tools .................................. ......9
SYSTEM DESCRIPTION .............................10
COMPONENT PARTS ................................... ....10
Component Parts Location .................................. ....10
Component Description ...........................................13
ABS Actuator and Electric Unit (Control Unit) .........14
Wheel Sensor and Sensor Rotor ............................14
Stop Lamp Switch ...................................................15
Steering Angle Sensor ............................................15
Yaw Rate/Side/Decel G sensor ...............................15
Brake Fluid Level Switch .........................................15
Parking Brake Switch ..............................................15
VDC OFF Switch .....................................................15
SYSTEM .............................................................16
System Description ............................................. ....16
Fail-safe ..................................................................25
Protection Function .................................................28
VDC FUNCTION .................................................... ....28
VDC FUNCTION : System Description ...................28
TCS FUNCTION ..................................................... ....31
TCS FUNCTION : System Description ....................31
ABS FUNCTION .................................................... ....32
ABS FUNCTION : System Description ....................33
EBD FUNCTION .................................................... ....34
EBD FUNCTION : System Description ....................34
HILL START ASSIST FUNCTION ......................... ....36
hill start assist FUNCTION : System Description ....36
BRAKE LIMITED SLIP DIFFERENTIAL (BLSD)
FUNCTION ............................................................. ....
37
BRAKE LIMITED SLIP DIFFERENTIAL (BLSD)
FUNCTION : System Description ............................
37
DIAGNOSIS SYSTEM [ABS ACTUATOR
AND ELECTRIC UNIT (CONTROL UNIT)] .......
40
CONSULT-III Function ............................................40
ECU DIAGNOSIS INFORMATION ..............45
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) .............................................
45
Reference Value .................................................. ....45
Fail-safe ...................................................................47
Protection Function ..................................................50
DTC Inspection Priority Chart ..................................50
DTC Index ...............................................................51
WIRING DIAGRAM ......................................53
BRAKE CONTROL SYSTEM ...........................53
Wiring Diagram .................................................... ....53
BASIC INSPECTION ...................................60
DIAGNOSIS AND REPAIR WORK FLOW .......60
Work Flow ............................................................ ....60
Diagnostic Work Sheet ............................................61
Revision: 2010 May2011 QX56

BRC-2
ADDITIONAL SERVICE WHEN REPLACING
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) ..............................................
63
Description ........................................................... ...63
ADJUSTMENT OF STEERING ANGLE SEN-
SOR NEUTRAL POSITION ...............................
64
Description ........................................................... ...64
Work Procedure ......................................................64
CALIBRATION OF DECEL G SENSOR ...........66
Description ........................................................... ...66
Work Procedure ......................................................66
DTC/CIRCUIT DIAGNOSIS ...................... ...68
C1101, C1102, C1103, C1104 WHEEL SEN-
SOR ................................................................. ...
68
DTC Logic ............................................................ ...68
Diagnosis Procedure ..............................................68
C1105, C1106, C1107, C1108 WHEEL SEN-
SOR ....................................................................
70
DTC Logic ............................................................ ...70
Diagnosis Procedure ..............................................70
C1109 POWER AND GROUND SYSTEM .........72
Description ........................................................... ...72
DTC Logic ...............................................................72
Diagnosis Procedure ..............................................72
C1111 PUMP MOTOR .......................................75
DTC Logic ............................................................ ...75
Diagnosis Procedure ..............................................75
C1115 WHEEL SENSOR ...................................77
DTC Logic ............................................................ ...77
Diagnosis Procedure ..............................................77
C1116 STOP LAMP SWITCH ............................79
DTC Logic ............................................................ ...79
Diagnosis Procedure ..............................................79
Component Inspection (Stop lamp Switch) ............85
Component Inspection (Stop Lamp Relay) .............86
C1118 TRANSFER CONTROL UNIT ................87
DTC Logic ............................................................ ...87
Diagnosis Procedure ..............................................87
C1120, C1122, C1124, C1126 ABS IN VALVE
SYSTEM .......................................................... ...
88
DTC Logic ............................................................ ...88
Diagnosis Procedure ..............................................88
C1121, C1123, C1125, C1127 ABS OUT
VALVE SYSTEM ................................................
90
DTC Logic ............................................................ ...90
Diagnosis Procedure ..............................................90
C1130 ENGINE SIGNAL ...................................92
DTC Logic ............................................................ ...92
Diagnosis Procedure ............................................ ...92
C1140 ACTUATOR RELAY SYSTEM ..............93
DTC Logic ............................................................ ...93
Diagnosis Procedure ...............................................93
C1142 PRESS SENSOR ...................................95
DTC Logic ............................................................ ...95
Diagnosis Procedure ...............................................95
C1143 STEERING ANGLE SENSOR ...............97
DTC Logic ............................................................ ...97
Diagnosis Procedure ...............................................97
C1144 INCOMPLETE STEERING ANGLE
SENSOR ADJUSTMENT ..................................
99
DTC Logic ............................................................ ...99
Diagnosis Procedure ...............................................99
C1145, C1146 YAW RATE/SIDE/DECEL G
SENSOR ...........................................................
100
DTC Logic ............................................................ .100
Diagnosis Procedure .............................................100
C1155 BRAKE FLUID LEVEL SWITCH ..........103
DTC Logic ............................................................ .103
Diagnosis Procedure .............................................103
Component Inspection ..........................................104
C1160 DECEL G SEN SET ..............................105
DTC Logic ............................................................ .105
Diagnosis Procedure .............................................105
C1164, C1165 CV SYSTEM .............................106
DTC Logic ............................................................ .106
Diagnosis Procedure .............................................106
C1166, C1167 SV SYSTEM .............................108
DTC Logic ............................................................ .108
Diagnosis Procedure .............................................108
C1170 VARIANT CODING ...............................110
DTC Logic ............................................................ .110
Diagnosis Procedure .............................................110
C118E ACCUMULATOR ..................................111
DTC Logic ............................................................ .111
Diagnosis Procedure .............................................111
U1000 CAN COMM CIRCUIT ...........................112
Description ........................................................... .112
DTC Logic .............................................................112
Diagnosis Procedure .............................................112
POWER SUPPLY AND GROUND CIRCUIT ....113
Description ........................................................... .113
Diagnosis Procedure .............................................113
PARKING BRAKE SWITCH .............................117
Component Function Check ................................ .117
Diagnosis Procedure .............................................117
Component Inspection ..........................................118
Revision: 2010 May2011 QX56

BRC-6
< PRECAUTION >[WITH VDC]
PRECAUTIONS
5. When the repair work is completed, re-connect bot
h 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:0000000006228176
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
Precaution for Brake SystemINFOID:0000000006222556
WARNING:
Clean any dust from the front brake and rear brake using a vacuum dust collector. Never blow by 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.
 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).
 Always connect the battery terminal when moving the vehicle.
 Turn the ignition switch OFF and disconnect the ABS actuator and
electric unit (control unit) harness connector or the battery negative
terminal before performing the work.
 Check that no brake fluid leakage is present after replacing the parts.
Precaution for Brak e Control SystemINFOID:0000000006222557
 Slight vibrations are felt on the brake pedal and the operation noises occur, when VDC function, TCS func-
tion, ABS function, EBD function, hill start assist function or brake limited slip differential (BLSD) function
operates. This is not a malfunction because it is caus ed by VDC function, TCS function, ABS function, EBD
function, hill start assist function or brake limited sl ip differential (BLSD) function that is normally operated.
 When starting engine or when starting vehicle just after starting engine, brake pedal may vibrate or motor
operating noise may be heard from engine compartment. This is normal condition.
 Brake stopping distance may become longer than models without ABS function depending on the road con-
ditions, when ABS function is operated on slippery r oad like rough road, gravel road or snowy road.
 When a malfunction is indicated, always collect info rmation from the customer about conditions of occur-
rence, estimate cause and perform operation. Check brake booster operation, brake fluid level and brake
fluid leakage, as well as electrical system.
 The optimum performance is achieved by control for V DC function, TCS function, ABS function, EBD func-
tion, hill start assist function or brake limited slip di fferential (BLSD) function when all of brakes, suspensions
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Revision: 2010 May2011 QX56