maintenance INFINITI QX56 2011 Factory User Guide

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".
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Revision: 2010 May2011 QX56

BRAKE PEDALBR-9
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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

BRAKE FLUIDBR-11
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NOTE:
Since brake fluid is conveyed by the motor, the brake pedal is not necessarily depressed.
RefillingINFOID:0000000006222465
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.
 Monitor the fluid level in the reservoir tank while performing the refilling.
1. Check that there is no foreign material in t he reservoir tank, and refill with new brake fluid.
CAUTION:
 Never reuse drained brake fluid.
 Never allow oils other than brake fl uid to enter the reservoir tank.
2. Turn the ignition switch ON.
3. Connect a vinyl tube to the bleed valve.
4. Depress the brake pedal and loosen the bleeder valve.
5. Depress the brake pedal several times until the re filled brake fluid is discharged and tighten the air
bleeder to the specified torque with the brake pedal depressed. Refer to BR-36, "
BRAKE CALIPER
ASSEMBLY : Exploded View".
6. Perform the air bleeding. Refer to BR-11, "
Bleeding Brake System".
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.
 Monitor the fluid level in the reservoir tank while performing the refilling.
1. Check that there is no foreign material in t he reservoir tank, and refill with new brake fluid.
CAUTION:
 Never reuse drained brake fluid.
 Never allow oils other than brake fl uid to enter the reservoir tank.
2. Turn the ignition switch ON.
3. Connect a vinyl tube to the bleed valve.
4. Depress the brake pedal and loosen the bleeder valve.
5. Depress the brake pedal several times until the re filled brake fluid is discharged and tighten the air
bleeder to the specified torque with the brake pedal depressed. Refer to BR-42, "
BRAKE CALIPER
ASSEMBLY : Exploded View".
NOTE:
Since brake fluid is conveyed by the motor, the brake pedal is not necessarily depressed.
6. Perform the air bleeding. Refer to BR-11, "
Bleeding Brake System".
Bleeding Brake SystemINFOID:0000000006222466
CAUTION:
 Bleed air in the following order: motor/accumulator assembly → front right brake → front left brake
→ rear left brake → and rear right brake.
 The VDC warning lamp, ABS warning lamp and br ake warning lamp turn ON and DTC “C118E” may
be detected in self-diagnosis result for “ABS” with CONSULT-III when the brake pedal is excessively
operated, such as air bleeding. This is not a system malfunction because this occurs due to the tem-
porary decrease in accumulator fl uid pressure. The system returns to normal condition when the
accumulator fluid pressure reaches the specified pressu re with the ignition switch ON and the VDC
Revision: 2010 May2011 QX56

BR-12
< PERIODIC MAINTENANCE >
BRAKE FLUID
warning lamp, ABS warning lamp, and brake warning lamp turn OFF. After these steps, erase self-
diagnosis results for “ABS” with CONSULT-III.
- DTC other than “C118E” is detected: Refer to BRC-51, "
DTC Index".
NOTE:
When the ignition switch is ON, the brake warning la mp may turns ON even when the parking brake pedal is
released with the brake fluid within the specified level. This indicates the decrease in accumulator fluid pres-
sure.
MOTOR/ACCUMULATOR ASSEMBLY
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.
 Monitor the fluid level in the reservoir tank while performing the air bleeding.
 Bleed air in the following order: motor/accumulator assembly → front right brake → front left brake
→ rear left brake → and rear right brake.
1. Turn the ignition switch OFF.
2. Depress the brake pedal 20 times or more.
3. Check that there is no foreign material in the reservoir tank, and refill with new brake fluid. CAUTION:
 Never reuse drained brake fluid.
 Never allow oils other than brake fluid to enter the reservoir tank.
4. Turn the ignition switch ON. NOTE:
The motor is activated and automatically stops.
5. Turn the ignition switch OFF.
6. 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.
7. Repeat steps 4 to 6 for 5 times.
8. Turn the ignition switch ON to check that the time between motor activation and automatic stop is less
than 18 seconds. If the time is 18 seconds or more, repeat from Step 4 to 8.
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.
 Monitor the fluid level in the reservoir tank while performing the air bleeding.
 Bleed air in the following order: motor/accumulator assembly → front right brake → front left brake
→ rear left brake → and rear right brake.
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 there is no foreign material in the reservoir tank, and refill with new brake fluid. CAUTION:
 Never reuse drained brake fluid.
 Never allow oils other than brake fluid to enter the reservoir tank.
4. Turn the ignition switch ON.
Revision: 2010 May2011 QX56

BRAKE FLUIDBR-13
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5. Connect a vinyl tube to the bleed valve.
6. Depress the brake pedal and loosen the bleeder valve.
7. Repeat steps 1 to 6 until all of the air is out of the brake line and tighten the air bleeder to the specified
torque with the brake pedal depressed. Refer to BR-36, "
BRAKE CALIPER ASSEMBLY : Exploded View".
8. Check that no drag feel is present for the front disc brake. Refer to BR-39, "
BRAKE CALIPER ASSEMBLY
: Inspection".
9. Check each item of brake pedal. Adjust it if t he measurement value is not the standard. Refer to BR-7,
"Inspection and Adjustment".
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.
 Monitor the fluid level in the reservoir tank while performing the air bleeding.
 Bleed air in the following order: motor/accumulator assembly → front right brake → front left brake
→ rear left brake → and rear right brake.
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 there is no foreign material in t he reservoir tank, and refill with new brake fluid.
CAUTION:
 Never reuse drained brake fluid.
 Never allow oils other than brake fl uid to enter the reservoir tank.
4. Turn the ignition switch ON.
5. Connect a vinyl tube to the bleed valve.
6. Depress the brake pedal and loosen the bleeder valve.
7. Depress and hold the brake pedal depression to disc harge 100 cc of brake fluid before tightening the air
bleeder to the specified torque. Refer to BR-42, "
BRAKE CALIPER ASSEMBLY : Exploded View".
NOTE:
Since brake fluid is conveyed by the motor, the brake pedal is not necessarily depressed.
8. Release the brake pedal.
9. Repeat steps 1 to 8 until all of the air is out of the brake line and tighten the air bleeder to the specified
torque with the brake pedal depressed. Refer to BR-42, "
BRAKE CALIPER ASSEMBLY : Exploded View".
10. Check that no drag feel is present for the rear disc brake. Refer to BR-45, "
BRAKE CALIPER ASSEMBLY
: Inspection".
11. Check each item of brake pedal. Adjust it if t he measurement value is not the standard. Refer to BR-7,
"Inspection and Adjustment".
BRAKE FLUID LEVEL ADJUSTMENT AFTER AIR BLEEDING
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.
Revision: 2010 May2011 QX56

BR-14
< PERIODIC MAINTENANCE >
BRAKE FLUID
3. Adjust brake fluid level to the reservoir tank MAX line.CAUTION:
Never adjust with the ignition switch ON.
4. Turn the ignition switch ON.
5. Check that the reservoir tank brake fluid level is 4 − 12 mm (0.16
− 0.47 in) lower than the MAX line.
NOTE:
Since brake fluid is in the accumulator in pressurized condition,
the reservoir tank brake fluid level should be lower than the MAX
line.
JPFIA0769ZZ
Revision: 2010 May2011 QX56

HYDRAULIC BOOSTER ASSEMBLYBR-15
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HYDRAULIC BOOSTER ASSEMBLY
InspectionINFOID:0000000006222467
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 warning 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 switch 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 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. Motor operating time : 18 seconds or less
Motor operating time : 2
− 11 seconds
Revision: 2010 May2011 QX56

BR-16
< PERIODIC MAINTENANCE >
FRONT DISC BRAKE
FRONT DISC BRAKE
BRAKE PAD
BRAKE PAD : Inspection and AdjustmentINFOID:0000000006222468
INSPECTION
Check the thickness of brake pad from the inspection hole (A) on
brake caliper assembly. Check use a scale if necessary.
ADJUSTMENT
CAUTION:
 Burnish contact surfaces between pads according to the following procedure after refinishing or
replacing brake pads, or if a soft pedal occurs at very low mileage.
 Be careful of vehicle speed because the brake does not operate firmly/securely until pads and disc
rotor are securely fitted.
 Only perform this procedure under safe road and traffic conditions. Use extreme caution.
1. Drive vehicle on straight, flat road.
2. Depress brake pedal with the power to stop vehicl e within 3 to 5 seconds until the vehicle stops.
3. Drive without depressing brake for a few minutes to cool the brake.
4. Repeat steps 1 to 3 until pad and disc rotor are securely fitted.
DISC ROTOR
DISC ROTOR : Inspec tion and AdjustmentINFOID:0000000006222469
INSPECTION
Appearance
Check surface of disc rotor for uneven wear, cracks, and serious damage. Replace it if necessary. Refer to
FA X - 8 , "
Removal and Installation" (2WD), FAX-18, "Removal and Installation" (AWD).
Runout
1. Fix the disc rotor to the wheel hub and bearing assembly with wheel nuts (2 points at least).
2. Check the wheel bearing axial end play before the inspection. Refer to FA X - 7 , "
Inspection" (2WD), FAX-
16, "Inspection" (AWD).
3. Inspect the runout with a dial indicator to measure at 10 mm (0.39 in) inside the disc edge.
4. Find the installation position that has a minimum runout by shift-
ing the disc rotor-to-wheel hub and bearing assembly installation
position by one hole at a time if the runout exceeds the limit
value.
5. Refinish the disc rotor if the runout is outside the limit even after performing the above operation. [When refinishing, use the Pro-
Cut PEM On-Car brake Lathe (Tool No. 38-PFM90.5) or equiva-
lent.]
CAUTION:Wear thickness : Refer to
BR-47, "
Front Disc Brake".
JPFIA0793ZZ
Runout : Refer to BR-47, "Front Disc Brake".
JPFIA0718ZZ
Revision: 2010 May2011 QX56

FRONT DISC BRAKEBR-17
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 Check in advance that the thickness of the disc rotor is wear thickness + 0.3 mm (0.012 in) or
more.
 If the thickness is less than wear thickness + 0. 3 mm (0.012 in), replace the disc rotor. Refer to
FA X - 8 , "
Removal and Installation" (2WD), FAX-18, "Removal and Installation".
Thickness
Check the thickness of the disc rotor using a micrometer. Replace
the disc rotor if the thickness is below the wear limit. Refer to FAX-8,
"Removal and Installation" (2WD), FAX-18, "Removal and Installa-
tion" (4WD).
ADJUSTMENT
CAUTION:
 Burnish contact surfaces between pads according to the following procedure after refinishing or
replacing brake pads, or if a soft pedal occurs at very low mileage.
 Be careful of vehicle speed because the brake does not operate firmly/securely until pads and disc
rotor are securely fitted.
 Only perform this procedure under safe road and traffic conditions. Use extreme caution.
1. Drive vehicle on straight, flat road.
2. Depress brake pedal with the power to stop vehicl e within 3 to 5 seconds until the vehicle stops.
3. Drive without depressing brake for a few minutes to cool the brake.
4. Repeat steps 1 to 3 until pad and disc rotor are securely fitted. Wear thickness : Refer to
BR-47, "
Front Disc Brake".
Wear thickness : Refer to BR-47, "
Front Disc Brake".
JPFIA0719ZZ
Revision: 2010 May2011 QX56