2011 INFINITI QX56 parking brake

MWI-80
< SYMPTOM DIAGNOSIS >
THE PARKING BRAKE RELEASE WARNING CONTINUES DISPLAYING, OR
DOES NOT DISPLAY
THE PARKING BRAKE RELEASE WA RNING CONTINUES DISPLAYING,
OR DOES NOT DISPLAY
DescriptionINFOID:0000000006221767
 The parking brake warning is displayed during vehi cle travel even though the parking brake is released.
 The parking brake warning is not displayed even though driving the vehicle with the parking brake applied.
Diagnosis ProcedureINFOID:0000000006221768
1.CHECK PARKING BRAKE WARNING LAMP OPERATION
1. Start engine.
2. Check the operation of the brake warni ng lamp when operating the parking brake.
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Removal and Installation".
NO >> GO TO 2.
2.CHECK PARKING BRAKE SWITCH SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Check the parking brake switch signal circuit. Refer to WCS-43, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK PARKING BRAKE SWITCH UNIT
Perform a unit check for the parking brake switch. Refer to BRC-118, "
Component Inspection".
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Removal and Installation".
NO >> Replace parking brake switch. Refer to PB-5, "
Exploded View".
Condition Warning lamp status
Parking brake applied ON
Parking brake released OFF
Revision: 2010 May2011 QX56

PB-1
BRAKES
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SECTION PB
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PB
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CONTENTS
PARKING BRAKE SYSTEM
PREPARATION ............. ...............................2
PREPARATION .............................................. .....2
Commercial Service Tools .................................. ......2
PERIODIC MAINTENANCE ..........................3
PARKING BRAKE SYSTEM .......................... .....3
Inspection and Adjustment .................................. ......3
PARKING BRAKE SHOE ...................................4
Adjustment .......................................................... ......4
REMOVAL AND INSTALLATION ................5
PARKING BRAKE CONTROL ....................... .....5
Exploded View .................................................... ......5
Removal and Installation ..................................... .....5
Adjustment ................................................................6
PARKING BRAKE SHOE ..................................7
Exploded View ..........................................................7
Removal and Installation ..........................................7
Inspection and Adjustment .......................................8
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .............................................
10
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
10
Parking Drum Brake ............................................ ....10
Parking Brake Control .............................................10
Revision: 2010 May2011 QX56

PARKING BRAKE SYSTEMPB-3
< PERIODIC MAINTENANCE >
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PERIODIC MAINTENANCE
PARKING BRAKE SYSTEM
Inspection and AdjustmentINFOID:0000000006222510
INSPECTION
1. Operate the parking brake pedal with a force of 196 N ( 20 kg, 44 lb). Check that the pedal stroke is within
the specified number of notches. (Check it by listening to clicks of ratchet.)
2. When brake warning lamp turns ON, check that the pedal stroke is within the specified number of
notches. (Check it by listening to clicks of ratchet.)
Inspect Components
Check the following items and replace if necessary.
• Check each component for installation condition such as looseness.
 Check the parking brake pedal assembly for bend, damage and cracks.
 Check the cables and equalizer for wear, damage and cracks.
 Check the parking brake switch. Refer to BRC-118, "
Component Inspection".
ADJUSTMENT
1. Remove the rear tires with power tool.
2. Fix the disc rotor using wheel nuts (2 points at least).
3. Release the parking brake pedal by turning the adjusting nut and loosening the cable.
4. Remove the plug from the disc rotor. Turn the adjuster (1) in the
direction (A) as shown in the figure using a suitable tool until the
disc rotor is locked.
5. Turn back the adjuster 5 or 6 notches from the locked position.
6. Rotate the disc rotor to check that there is no drag. Install the plug. If any drag is found, follow the procedure described below.
a. Adjust parking brake pedal stroke again.
b. Check rear disc brake. Refer to BR-45, "
BRAKE CALIPER
ASSEMBLY : Inspection".
7. Adjust the cable with the following procedure.
a. Temporarily adjust the cable so that the parking brake pedal operating force immediately before the full stroke reaches 490 N (50kg, 110 lb) or more.
b. Maintain the parking brake pedal at 490 N (50kg, 110 lb) for 30 minutes or more.
c. Adjust the parking brake pedal st roke by turning the adjusting nut.
CAUTION:
Never reuse the adjusting nu t if the nut is removed.
d. Operate the parking brake pedal with a force of 196 N ( 20 kg, 44 lb). Check that the pedal stroke is within
the specified number of notches. (Check it by listening to clicks of ratchet.)
e. Rotate the disc rotor to check that there is no drag. Install the plug. If any drag is found, follow the proce-
dure described below.
i. Adjust parking brake pedal stroke again.
ii. Check rear disc brake. Refer to BR-45, "
BRAKE CALIPER ASSEMBLY : Inspection".
Number of notches : Refer to
PB-10, "
Parking Brake Control".
Number of notches : Refer to PB-10, "
Parking Brake Control".
Number of notches : Refer to PB-10, "
Parking Brake Control".
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Revision: 2010 May2011 QX56

PB-4
< PERIODIC MAINTENANCE >
PARKING BRAKE SHOE
PARKING BRAKE SHOE
AdjustmentINFOID:0000000006222511
1. Adjust parking brake pedal stroke. Refer to PB-3, "Inspection and Adjustment".
2. Perform parking brake break-in (drag on) operati on by driving vehicle under the following conditions:
Drive forward
 Vehicle speed: Approx. 83 km/h (51. 6 MPH) set (constant and forward)
 Parking brake pedal operating force: 255 N ( 26.0 kg, 57.3 lb) (9 notches) set contact
 Time: Approx. 33 sec.
CAUTION:
• To prevent lining from getting t oo hot, allow a cool off period of approx. 5 minutes after every
break-in operation.
 Never perform excessive break-in operations, b ecause doing so may cause uneven or early wear
of the lining.
3. After the break-in procedure, check park ing brake pedal stroke of parking brake.
CAUTION:
If it is out of the specification, adjust again. Refer to Refer to PB-3, "
Inspection and Adjustment".
Revision: 2010 May2011 QX56

PARKING BRAKE CONTROLPB-5
< REMOVAL AND INSTALLATION >
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REMOVAL AND INSTALLATION
PARKING BRAKE CONTROL
Exploded ViewINFOID:0000000006222512
Removal and InstallationINFOID:0000000006222513
REMOVAL
1. Remove rear tires with power tool.
2. Remove instrument lower panel LH. Refer to IP-14, "
Removal and Installation".
3. Hang fuse block (J/B) not to interfere with work.
4. Disconnect parking brake switch harness connector.
5. Remove adjusting nut and loosen front cable.
6. Remove parking brake pedal assembly.
7. Remove center console assembly. Refer to IP-25, "
Removal and Installation".
8. Separate front cable from rear cable, and remove front cable.
9. Remove pin and remove rear cable from toggle lever. Refer to PB-7, "
Removal and Installation".
10. Remove rear cable.
INSTALLATION
Rote the following, Install the reverse order of the removal.
 Never reuse the adjusting nut.
 Perform adjustment after installation. Refer to PB-6, "
Adjustment".
1. Front cable 2. Parking brake pedal assembly 3. Pedal pad
4. Adjusting nut 5. Parking brake switch 6. Spring
7. Rear cable (left side) 8. Rear cable (right side) 9. 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

PB-6
< REMOVAL AND INSTALLATION >
PARKING BRAKE CONTROL
Adjustment
INFOID:0000000006222514
ADJUSTMENT AFTER INSTALLATION
Adjust the parking brake pedal stroke. Refer to PB-3, "Inspection and Adjustment".
Revision: 2010 May2011 QX56

PARKING BRAKE SHOEPB-7
< REMOVAL AND INSTALLATION >
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PARKING BRAKE SHOE
Exploded ViewINFOID:0000000006222515
Removal and InstallationINFOID:0000000006222516
REMOVAL
WARNING:
Clean any dust from the parking brake shoes an d back plates with a vacuum dust collector. Never
blow with compressed air.
1. Remove rear tires with power tool.
2. Remove disc rotor. Refer to RAX-7, "
Removal and Installation".
3. Remove anti-rattle pins, retainers, anti-rattle springs, return spring and adjuster spring. CAUTION:
Never drop the removed parts.
4. Remove parking brake shoes, adjuster assembly, and toggle lever. CAUTION:
Never drop the removed parts.
5. For the removal of back plate, refer to RAX-7, "
Removal and Installation".
6. Perform inspection after removal. Refer to PB-8, "
Inspection and Adjustment".
INSTALLATION
Note the following, install in the reverse order of removal.
 Apply PBC (Poly Butyl Cuprysil) grease or silicone- based grease to the back plate and brake shoe. Refer to
PB-7, "
Exploded View".
1. Back plate 2. Parking brake shoe 3. Toggle lever
4. Return spring 5. Anti-rattle spring 6. Retainer
7. Anti-rattle pin 8. Adjuster spring 9. Adjuster
: Apply PBC (Poly Butyl Cuprysil) grease or silicone-based grease.
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Revision: 2010 May2011 QX56

PB-8
< REMOVAL AND INSTALLATION >
PARKING BRAKE SHOE
 Assemble adjusters so that threaded part is expanded when rotat-ing it in the direction shown by arrow ( ).
 Shorten adjuster by rotating it.
 When disassembling apply PBC (Poly Butyl Cuprysil) grease or sil- icone-based grease to threads.
 Check the component parts of parking brake shoe assembly are installed properly.
 Check brake shoe sliding surface and drum inner surface for
grease. Wipe it off if it adhere on the surfaces.
 Perform adjustment after installation. Refer to PB-8, "
Inspection
and Adjustment".
Inspection and AdjustmentINFOID:0000000006222517
INSPECTION AFTER REMOVAL
Lining Thickness Inspection
Check thickness (A) of lining.
Drum Inner Diameter Inspection
Check inner diameter (B) of drum.
Other Inspections
Check the following items, and replace the parts if necessary.
 Parking brake shoe for excessive wear, damage, and peeling.
 Anti-rattle pin and retainer for excessive wear, damage and rust.
 Adjuster spring, return spring and anti-rattle spring for settling, excessive wear, damage, and rust.
 Adjuster for smoothness.
A: For right side brake
B: For left side brake
: Vehicle front
: Adjuster expands
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A : Refer to PB-10, "Parking Drum Brake".
SBR021A
B: Refer to PB-10, "Parking Drum Brake".
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Revision: 2010 May2011 QX56