2008 INFINITI QX56 torque

BR-32
< ON-VEHICLE REPAIR >
FRONT DISC BRAKE
5. Remove torque member bolts, and remove brake caliperassembly.
CAUTION:
Do not drop brake pad.
6. Apply matching marks to disc rotor and wheel hub assembly as shown if the disc rotor is to be reused, then remove disc rotor.
CAUTION:
Put matching marks on wheel hub assembly and disc rotor
if the disc rotor is to be reused.
INSTALLATION
1. If reusing the disc rotor, use the matching marks to align discrotor on the wheel hub assembly as shown, then install disc
rotor using a wheel nut to hold it in place.
CAUTION:
Use matching marks on wheel hub assembly and disc rotor
if the disc rotor is to be reused.
2. Install brake caliper assembly to vehicle, and tighten torque member bolts to the specified torque.
CAUTION:
Do not allow oil or any moisture on all contact surfaces
between steering knuckle and caliper assembly, bolts, and
washer.
SFIA2437E
SDIA2608E
SDIA2608E
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Revision: March 2010 2008 QX56

FRONT DISC BRAKEBR-33
< ON-VEHICLE REPAIR >
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3. Install brake hose to brake caliper assembly using new copper washers. Align the brake hose to the projection as shown and
tighten union bolts to the specified torque.
CAUTION:
• Do not reuse copper washers.
• Securely attach brake hose to projection on cylinderbody.
4. Refill with new brake fluid and bleed air. Refer to BR-17, "
Bleeding Brake System".
5. Check front disc brake for drag and correct as necessary.
6. Install front wheel and tires. Refer to WT-48, "
Rotation".
SFIA2431E
Revision: March 2010 2008 QX56

REAR DISC BRAKEBR-35
< ON-VEHICLE REPAIR >
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By pushing in piston, br ake fluid returns to master cylinder reservoir tank. Watch the brake fluid
level in the reservoir tank.
NOTE:
Using a suitable tool, makes it easier to push in the piston.
2. Apply Molykote AS-880N grease to knuckle slide where brake pads contact. CAUTION:
Do not get grease on the brake pads or brake rotor friction surfaces.
3. Install pads to cylinder body.
4. Install cylinder body to torque member.
5. Install cylinder body sliding pin bolts and tighten to specification. Refer to BR-35, "
Exploded View of Brake
Caliper".
6. Check rear disc brake for drag.
7. Install rear wheel and tires. Refer to WT-48, "
Rotation".
8. Check brake fluid level. Refer to BR-17, "
On Board Inspection"
Brake Burnishing ProcedureINFOID:0000000004894520
Burnish contact surfaces between disc rotors and pads according to following procedure after refinishing or
replacing rotors, after replacing pads, or if a soft pedal occurs at very low mileage.
CAUTION:
• Be careful of vehicle speed because the brake does not operate easily until pad and disc rotor are securely seated.
• 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 vehicle 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 through 3 until pad and disc rotor are securely seated.
Exploded View of Brake CaliperINFOID:0000000004894521
AWFIA0684GB
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-40
< DISASSEMBLY AND ASSEMBLY >
FRONT DISC BRAKE
4. Remove piston seals from cylinder body, using a suitable tool.CAUTION:
• Be careful not to damage cylinder inner wall.
• Do not reuse piston seals.
5. Remove the bleed valve and cap.
CALIPER INSPECTION
Cylinder Body
Check inside surface of cylinder for score, rust, wear, damage or foreign materials. If any of the above condi-
tions are observed, replace cylinder body.
Minor damage from rust or foreign materials may be el iminated by polishing surface with a fine emery paper.
Replace cylinder body if necessary.
CAUTION:
Use new brake fluid for cleaning. Do not use mineral oils such as gasoline or kerosene.
Torque Member
Check for wear, cracks, and damage. If damage or def ormation is present, replace the affected part.
Piston
Check piston for score, rust, wear, damage or presence of foreign materials. Replace if any of the above con-
ditions are observed.
CAUTION:
Piston sliding surface is plated, do not polish with emery paper even if rust or foreign materials are
stuck to sliding surface.
Sliding Pins, and Sliding Pin Boots
Check sliding pin and sliding pin boot for wear, damage, and cracks. If damage or deformation is present,
replace the affected part.
CAUTION:
Trailing/upper slidi ng pin must be replaced at each service.
ASSEMBLY
1. Install bleed valve and cap.
2. Apply rubber grease to new piston seals and insert seals into
grooves on cylinder body.
CAUTION:
Do not reuse piston seals.
SFIA0141E
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Revision: March 2010 2008 QX56

FRONT DISC BRAKEBR-41
< DISASSEMBLY AND ASSEMBLY >
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3. Apply rubber grease to piston boots. Cover the piston ends with piston boots, and then install cylinder side lip on piston boots
securely into the grooves on cylinder body.
CAUTION:
Do not reuse piston boots.
4. Apply clean brake fluid to pistons (1), then install pistons into cyl- inder body and insert piston boot (2) side lip into groove of pis-
tons as shown.
CAUTION:
Press the pistons evenly to prevent damage to cylinder
wall.
5. Apply rubber grease and install new sliding pins, bushing and sliding pin boots to torque member.
6. Install cylinder body. Tighten sliding pin bolts to the specified torque.
SFIA2432E
JPFIA0041ZZ
Revision: March 2010 2008 QX56

REAR DISC BRAKEBR-43
< DISASSEMBLY AND ASSEMBLY >
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4. Using a suitable tool, remove piston seal from cylinder body as shown.
CAUTION:
Be careful not to damage cylinder body inner wall.
5. Remove the bleed valve and cap.
CALIPER INSPECTION
Cylinder Body
Check inside surface of cylinder body for score, rust wear, damage or foreign materials. If any of the above
conditions are observed, replace cylinder body.
Minor damage from rust or foreign materials may be eliminated by polishing surface with a fine emery paper.
Replace cylinder body if necessary.
CAUTION:
• Use new brake fluid to clean. Do not use mi neral oils such as gasoline or kerosene.
Torque Member
Check for wear, cracks, and damage. If damage or deformation is present, replace the affected part.
Piston
Check piston for score, rust, wear, damage or presence of foreign materials. Replace if any of the above con-
ditions are observed.
CAUTION:
• Piston sliding surface is plated, do not polish with emery paper even if rust of foreign materials are
stuck to sliding surface.
Sliding Pin Bolts and Sliding Pin Boots
Make sure there is no wear, damage, or cracks in sliding sleeve and sliding sleeve boots, and if there are,
replace them.
ASSEMBLY
1. Install the bleed valve and cap.
2. Apply rubber grease to the new piston seal (1) and insert the new piston seal (1) into the groove on the cylinder body.
CAUTION:
Do not reuse piston seal.
3. Apply rubber grease to the new piston boot (1). Cover the piston end (2) with the piston boot (1), and then install the cylinder side
lip on the piston boot (1) securely into the groove on the cylinder
body.
CAUTION:
• Do not reuse piston boot.
• Press pistons in evenly and vary the pressing points toprevent the cylinder inner wall from being damaged.
PFIA0269E
JPFIA0039ZZ
JPFIA0040ZZ
Revision: March 2010 2008 QX56

TCS
BRC-15
< FUNCTION DIAGNOSIS > [VDC/TCS/ABS]
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TCS
System DiagramINFOID:0000000001691092
System DescriptionINFOID:0000000001686244
• Traction Control System is a function that electronically controls engine torque, brake fluid pressure and A/T gear position to ensure the optimum slippage ratio at drive wheels by computing wheel speed signals from 4
wheel sensors. When ABS actuator and electric unit (control unit) detects a spin at drive wheels (rear
wheels), it compares wheel speed signals from all 4 wheel s. At this time, LH and RH rear brake fluid pres-
sure are controlled, while fuel being cut to engine and throttle valve being closed to reduce engine torque by
the control unit. Further more, throttle position is continuously controlled to ensure the optimum engine
torque at all times.
• During TCS operation, it inform s driver of system operation by flashing SLIP indicator lamp.
• Electrical system diagnosis by CONSULT-III is available.
AWFIA0065GB
Revision: March 2010 2008 QX56