lock INFINITI QX56 2008 Factory Workshop Manual

BRAKE PEDALBR-15
< ON-VEHICLE MAINTENANCE >
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ON-VEHICLE MAINTENANCE
BRAKE PEDAL
Inspection and AdjustmentINFOID:0000000004894492
INSPECTION
1. Inspect the brake pedal free height (H) from the floor using Tool at a 90 ° angle to the floor as shown.
2. Adjust the brake pedal height to specifications. CAUTION:
When equipped with adjustable pedal, the pedal must be in
the forward most (closest to th e floor) position for pedal
height measurement.
Brake Pedal Specifications
Unit: mm (in)
ADJUSTMENT
1. Loosen the stop lamp switch and ASCD cancel switch by turning them 45° counterclockwise.
Tool number : — (J-46532)
ALFIA0149ZZ
Pedal free height (H) with pedal in forward most position
Refer to BR-45, "Brake Pedal".
Pedal travel (T) Refer to BR-45, "
Brake Pedal".
Clearance between brake pedal bracket and threaded end of stop lamp switch and
ASCD cancel switch Refer to
BR-45, "
Brake Pedal".
Revision: March 2010 2008 QX56

BR-16
< ON-VEHICLE MAINTENANCE >
BRAKE PEDAL
2. Loosen lock nut (A) on the input rod, then turn input rod to adjustthe brake pedal to the specified height. When finished adjusting,
tighten the lock nut (A) to specification.
CAUTION:
Make sure that the screw portion of the end of input rod is
located inside the clevis.
3. With the brake pedal pulled up and held by hand, press the stop lamp switch and the ASCD cancel switch in until the threaded
ends contact the brake pedal bracket.
4. With the threaded ends of the stop lamp switch and ASCD switch contacting the pedal bracket, turn the switches 45 ° clock-
wise to lock in place. Check that the stop lamp switch and ASCD
cancel switch threaded end to brake pedal bracket gap (C) is
within specifications.
CAUTION:
Make sure that the gap (C) between the brake pedal bracket
and stop lamp switch and ASCD cancel switch threaded
ends are within specification.
5. Check the brake pedal for smooth operation. CAUTION:
Make sure that the stop lamp goes off when the brake pedal
is released.
6. Start the engine and check the height of the brake pedal when depressing it. Lock nut (A) : 18.7 N·m (1.9 kg-m, 14 ft-lb)
PFIA0436E
Revision: March 2010
2008 QX56

BR-20
< ON-VEHICLE REPAIR >
BRAKE PEDAL
3. Disconnect the adjustable brake pedal cable from the adjustablepedal electric motor.
• Unlock (1) then pull (2) the adjustable brake pedal cable to dis-connect it from the adjustable pedal electric motor as shown.
4. Remove snap pin and clevis pin from the clevis of brake booster.
5. Remove brake pedal assembly nuts and remove the brake pedal assembly. • Temporarily install the brake pedal assembly nuts by hand to support the brake booster.
WARNING:
Do not bend the brake tubing.
CAUTION:
• Before removal and installation, the accelerator and brake pedals must be in the forward mostposition (closest to the floor). This is to align the base position of the accelerator and brake ped-
als.
• Do not disassemble the brake pedal adjusting mechanism.
• Avoid damage from dropping th e brake pedal assembly during handling.
• Keep the brake pedal assembly away from water.
INSPECTION AFTER REMOVAL
Check the brake pedal assembly for the following items:
• Crack or deformation of clevis pin stopper
• Clevis pin deformation
• Crack of any welded portion of the brake pedal assembly
• Brake pedal bend or deformation
INSTALLATION
Installation is in the reverse order of removal.
• Check the brake pedal for smooth operation. Ther e should be no binding or sticking when applying or
releasing the brake pedal.
• Check the brake pedal adjustable feature for smooth operation. There should be no binding or sticking when adjusting the brake pedal forward or backward.
• After installing the brake pedal assembly, be sure to adjust it. Refer to BR-15, "
Inspection and Adjustment".
LBIA0374E
SBR997
Revision: March 2010 2008 QX56

BRAKE TUBE AND HOSEBR-21
< ON-VEHICLE REPAIR >
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BRAKE TUBE AND HOSE
Hydraulic CircuitINFOID:0000000004894506
CAUTION:
• All hoses and piping (tubes) must be fr ee from excessive bending, twisting and pulling.
• Make sure there is no interference with other parts when turning the steering wheel both clockwise
and counterclockwise.
• The brake piping is an important safety part. If a brake fluid leak is detected, always disassemble the
parts. Replace applicable part with a new one, if necessary.
• Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is
splashed on painted areas, wash it away with water immediately.
• Do not bend or twist brake hose sharply, or strongly pull it.
• When removing components, cover connections so that no dirt, dust, or other foreign matter gets in.
• Refill with new specified brake fluid. Refer to MA-12, "
Fluids and Lubricants".
• Do not reuse drained brake fluid.
Removal and Installation of Fr ont Brake Piping and Brake HoseINFOID:0000000004894507
REMOVAL
1. Remove front wheel and tire using power tools.
2. Remove brake reservoir cap.
1. Actuator 2. Master cylinder3. Brake booster
4. Connector A. Union bolt
18.2 N·m (1.9 kg-m, 13 ft-lb) B. Flare nut M12
18.2 N·m (1.9 kg-m, 13 ft-lb)
C. Flare nut M10 13.0 N·m (1.3 kg-m, 10 ft-lb)
AWFIA0411ZZ
Revision: March 2010 2008 QX56

BR-22
< ON-VEHICLE REPAIR >
BRAKE TUBE AND HOSE
3. Remove brake tube from brake hose, using a suitable tool.
4. Remove lock plate and brake hose from bracket.
5. Remove union bolt and then remove brake hose from cylinderbody.
INSTALLATION
1. Install brake hose by aligning with the protrusion on cylinderbody, then install the union bolt and new copper washers and
tighten to specification. Refer to BR-13, "
Hydraulic Circuit".
CAUTION:
Do not reuse copper washer.
2. Insert brake hose end through bracket, then secure it to bracket with lock plate.
3. Install brake tube to brake hose, then tighten the flare nut using a suitable tool. Refer to BR-13, "
Hydraulic Circuit".
4. Refill brake fluid and bleed air. Refer to BR-17, "
Drain and Refill".
5. Install the front wheel and tire. Refer to WT-48, "
Rotation".
Removal and Installation of Rear Brake Piping and Brake HoseINFOID:0000000004894508
REMOVAL
1. Remove rear wheel and tire using power tools.
2. Remove brake reservoir cap.
LFIA0213E
LFIA0214E
SFIA1137E
LFIA0213E
Revision: March 2010 2008 QX56

BRAKE TUBE AND HOSEBR-23
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3. Remove brake tube from brake hose, using a suitable tool.
4. Remove lock plate and brake hose from bracket.
5. Remove union bolt and then remove brake hose from cylinder body.
INSTALLATION
1. Install brake hose by aligning with the protrusion on cylinderbody, then install the union bolt and new copper washers and
tighten to specification. Refer to BR-13, "
Hydraulic Circuit".
CAUTION:
Do not reuse copper washer.
2. Insert brake hose end through bracket, then secure it to bracket with lock plate.
3. Install brake tube to brake hose, then tighten the flare nut using a suitable tool. Refer to BR-13, "
Hydraulic Circuit".
4. Refill brake fluid and bleed air. Refer to BR-17, "
Bleeding Brake System".
5. Install rear wheel and tire. Refer to WT-48, "
Rotation".
Inspection After InstallationINFOID:0000000004894509
CAUTION:
Brake tubes and hoses are important safety parts. Always disassemble the parts and retighten their fit-
tings, if a brake fluid leak is detected. Replace applicable part with a new one, if a damaged part is
detected.
LFIA0213E
LFIA0212E
SFIA1137E
LFIA0213E
Revision: March 2010 2008 QX56

BR-26
< ON-VEHICLE REPAIR >
BRAKE BOOSTER
BRAKE BOOSTER
Removal and InstallationINFOID:0000000004894511
CAUTION:
• Be careful not to deform or bend brake piping while removing and installing brake booster.
• Replace clevis pin if it is damaged.
• Be careful not to damage brake booster stud bolt threads. If brake booster is tilted or inclined during
installation, dash panel may damage the threads.
• Attach the check valve in the correct direction.
REMOVAL
1. Remove air duct and resonator assembly. Refer to EM-25, "Removal and Installation".
2. Remove cowl top assembly. Refer to EXT-18, "
Removal and Installation".
3. Remove master cylinder assembly from brake booster. Refer to BR-25, "
Removal and Installation".
4. Remove vacuum hose from brake booster. Refer to BR-28, "
Removal and Installation".
5. Disconnect active booster and delta stroke s ensor harness connectors from brake booster.
6. Remove the instrument lower panel LH. Refer to IP-11, "
Exploded View".
7. Remove brake pedal to clevis attachment snap pin and clevis pin from inside the vehicle.
8. Remove brake booster to brake pedal assembly nuts.
9. Reposition the A/C line out of the way.
10. Remove brake booster and spacer from dash panel.
INSPECTION AFTER REMOVAL
Output Rod Length Inspection
1. Reservoir tank 2. Master cylinder assembly3. Gasket
4. Brake pedal 5. Lock nut 6. Spacer block
7. Brake booster 8. Active booster9. Delta stroke sensor
AWFIA0416GB
Revision: March 2010 2008 QX56

BRAKE BOOSTERBR-27
< ON-VEHICLE REPAIR >
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1. Using a hand vacuum pump, apply a vacuum of – 66.7 kPa (– 500 mmHg, –19.69 inHg) to brake booster.
2. Check output rod length.
INSTALLATION
1. Loosen lock nut to adjust input r od length so that the length (B)
is set at the specified value.
2. After adjusting length (B), temporarily tighten lock nut and install brake booster and spacer block.
• Install the gaskets and spacer block between brake boosterand dash panel.
3. Connect brake pedal to clevis on the input rod.
4. Install brake booster to brake pedal assembly nuts and tighten to the specified torque.
5. Connect active booster and delta stroke s ensor harness connectors to brake booster.
6. Connect vacuum hose to brake booster.
7. Install master cylinder assembly to brake booster. Refer to BR-25, "
Removal and Installation".
8. Adjust the height and play of brake pedal. Refer to BR-15, "
Inspection and Adjustment".
9. Tighten lock nut of input rod to specification.
10. Install the instrument lower panel LH. Refer to IP-11, "
Exploded View".
11. Secure A/C line into clips.
12. Install cowl top assembly. Refer to EXT-18, "
Removal and Installation".
13. Install air duct and resonator assembly. Refer to EM-25, "
Removal and Installation".
14. Refill with new brake fluid and bleed air. Refer to BR-17, "
Bleeding Brake System".
Output rod length : Refer to
BR-46, "
Brake
Booster".
SBR208E
Input rod length (B) : Refer to BR-46, "Brake
Booster".
WFIA0382E
Revision: March 2010 2008 QX56

FRONT DISC BRAKEBR-39
< DISASSEMBLY AND ASSEMBLY >
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FRONT DISC BRAKE
Disassembly and AssemblyINFOID:0000000004894497
DISASSEMBLY
1. Remove sliding pin bolt, and then remove the pad, shim, shim cover, and pad retainer from the torque member.
2. Remove sliding pins and sliding pin boots from torque member.
3. Place a wooden block as shown, and blow air from union bolt hole to remove pistons and piston boots.
CAUTION:
Do not get your fingers caught in piston.
1. Sliding pin bolt 2. Bleed valve 3. Cap
4. Union bolt 5. Brake hose 6. Copper washer
7. Torque member bolt 8. Sliding pin boot 9. Torque member
10. Sliding pin 11. Piston boot 12. Piston
13. Piston seal 14. Cylinder body R: Rubber grease
B: Brake fluid
AWFIA0683GB
BRB0032D
Revision: March 2010 2008 QX56

BR-42
< DISASSEMBLY AND ASSEMBLY >
REAR DISC BRAKE
REAR DISC BRAKE
Disassembly and AssemblyINFOID:0000000004894498
DISASSEMBLY
1. Remove pads from cylinder body.
2. Remove sliding sleeve and boot from cylinder body.
3. Place a wooden block as shown, and blow air into union bolthole to remove piston and piston boot.
CAUTION:
Do not get your fingers caught in piston.
1. Union bolt 2. Brake hose 3. Copper washer
4. Cap 5. Bleed valve 6. Sliding pin bolt
7. Cylinder body 8. Piston seal 9. Piston
10. Piston boot 11. Knuckle slide 12. Sliding sleeve boot
13. Sliding sleeve B: Brake fluidR: Rubber grease
M: Molykote 7439 grease Front
AWFIA0684GB
BRD0041D
Revision: March 2010 2008 QX56