2011 INFINITI QX56 brake

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.
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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
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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".
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Runout : Refer to BR-47, "Front Disc Brake".
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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

BR-18
< PERIODIC MAINTENANCE >
REAR DISC BRAKE
REAR DISC BRAKE
BRAKE PAD
BRAKE PAD : Inspection and AdjustmentINFOID:0000000006222470
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:0000000006222471
INSPECTION
Appearance
Check surface of disc rotor for uneven wear, cracks, and serious damage. Replace it if necessary. Refer to
RAX-7, "
Removal and Installation".
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 RAX-5, "
Inspection".
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:
 Check in advance that the thickn ess of the disc rotor is wear thickness + 0.3 mm (0.012 in) or
more. Wear thickness : Refer to
BR-47, "
Rear Disc Brake".
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Runout : Refer to BR-47, "Rear Disc Brake".
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Revision: 2010 May2011 QX56

REAR DISC BRAKEBR-19
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 If the thickness is less than wear thickness + 0. 3 mm (0.012 in), replace the disc rotor. Refer to
RAX-7, "
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 RAX-7,
"Removal and Installation".
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, "
Rear Disc Brake".
Wear thickness : Refer to BR-47, "
Rear Disc Brake".
JPFIA0722ZZ
Revision: 2010 May2011 QX56

BR-20
< REMOVAL AND INSTALLATION >
BRAKE PEDAL
REMOVAL AND INSTALLATION
BRAKE PEDAL
Exploded ViewINFOID:0000000006222472
Removal and InstallationINFOID:0000000006222473
REMOVAL
CAUTION:
Never removing brake pedal stroke sensor. (With pre-crash seat belt)
1. Remove the instrument lower panel LH. Refer to IP-14, "
Removal and Installation".
2. Disconnect the brake pedal stroke sensor har ness connector. (With pre-crash seat belt)
3. Disconnect the stop lamp switch harness connector and brake switch harness connector.
4. Rotate the stop lamp switch and the brake switch counterclockwise to remove.
5. Remove the snap pin, and then remove the clevis pin from the clevis of brake booster.
6. Remove the brake pedal assembly. CAUTION:
Hold the hydraulic booster assembly so as not to drop out or contact them other parts.
7. Perform inspection after removal. Refer to BR-21, "
Inspection and Adjustment".
INSTALLATION
Note the following, and install in the reverse order of removal.
 Apply the multi-purpose grease to the clevis pin and the matching faces.
1. Brake pedal stroke sensor (with pre-
crash seat belt) 2. Clevis pin 3. Brake pedal assembly
4. Brake pedal pad 5. Clip 6. Brake switch
7. Stop lamp switch 8. Snap pin : Apply multi-purpose grease.
Refer to GI-4, "
Components" for symbols not described on the above.
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Revision: 2010 May2011 QX56