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Home >> Infiniti Truck >> 2011 >> QX56 AWD V8-5.6L (VK56VD) >> Repair and Diagnosis >> Maintenance >> Brake Bleeding >> Service and Repair

Brake Bleeding: Service and Repair





BRAKE FLUID


Bleeding Brake System


CAUTION:
- Bleed air in the following order: motor/accumulator assembly to front right brake to front left brake
to rear left brake to and rear right brake.
- The VDC warning lamp, ABS warning lamp and brake 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 temporary decrease in accumulator fluid pressure. The system returns to normal condition when the accumulator fluid pressure reaches the specified pressure with the ignition switch ON and the VDC 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: Testing and Inspection.
NOTE:
When the ignition switch is ON, the brake warning lamp 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 pressure.

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 water if it gets on a painted surface.
- Never operate the brake pedal with the reservoir cap removed. Failure to do this may cause the scattering 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 to front right brake to front left brake
to rear left brake to 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 water if it gets on a painted surface.
- Never operate the brake pedal with the reservoir cap removed. Failure to do this may cause the scattering 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 to front right brake to front left brake
to rear left brake to 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.
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. Exploded View.
8. Check that no drag feel is present for the front disc brake. Inspection, "BRAKE CALIPER ASSEMBLY
: Inspection".
9. Check each item of brake pedal. Adjust it if the measurement value is not the standard. Inspection and Adjustment, "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 water if it gets on a painted surface.
- Never operate the brake pedal with the reservoir cap removed. Failure to do this may cause the scattering 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 to front right brake to front left brake
to rear left brake to 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.
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 discharge 100 cc of brake fluid before tightening the air bleeder to the specified torque. 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. Exploded View.
10. Check that no drag feel is present for the rear disc brake. Inspection, "BRAKE CALIPER ASSEMBLY
: Inspection".
11. Check each item of brake pedal. Adjust it if the measurement value is not the standard. Inspection and Adjustment, "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.





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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