2009 INFINITI QX56 ECU

BRAKE TUBE AND HOSEBR-23
< ON-VEHICLE REPAIR >
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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 wheel and tire assembly. Refer to WT-41, "
Adjustment"
Inspection After InstallationINFOID:0000000004042334
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.
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Revision: December 20092009 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 harness connector and delta st roke sensor 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-12, "
Exploded View".
11. Secure A/C line into clips.
12. Install cowl top extension. 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".
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Revision: December 20092009 QX56

BR-30
< ON-VEHICLE REPAIR >
FRONT DISC BRAKE
4. Hang cylinder body with a wire, and remove pads, pad retainers,shims, and shim covers from torque member.
CAUTION:
When removing the pad retainer from the torque member,
lift it in the direction indi cated by the arrow as shown so
that it does not deform.
INSTALLATION
1. Push piston in using suitable tool.
CAUTION:
In the case of replacing a pad with new one, ch eck the brake fluid level in the reservoir tank
because brake fluid returns to reservoir tank when pressing piston in.
NOTE:
Use a suitable tool to easily press piston.
2. Apply Molykote AS-880N grease or equivalent to between shim cover and shim. Install inner shim, inner shim cover to inner pad, and install outer shim, outer shim cover to outer pad.
3. Install pad retainers and pads to torque member. CAUTION:
• Securely assemble pad retainers so that they ar e not being lifted up from torque member.
• Both inner and outer pads have a pad return system on the pad retainer. Install pad return lever
securely to pad wear sensor.
4. Install cylinder body to torque member.
5. Install sliding pin bolts, and tighten it to the specified torque. Refer to BR-29, "
Removal and Installation of
Brake Pads".
6. Check front disc brake for drag and correct as necessary.
7. Install front wheel and tires. Refer to WT-41, "
Adjustment".
8. Check brake fluid level. Refer to BR-17, "
On Board Inspection".
Brake Burnishing ProcedureINFOID:0000000005856029
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.
SBR556E
Revision: December 20092009 QX56

BR-34
< ON-VEHICLE REPAIR >
REAR DISC BRAKE
REAR DISC BRAKE
Exploded View of Brake PadsINFOID:0000000004057217
Removal and Installation of Brake PadINFOID:0000000004057218
WARNING:
Clean dust on caliper and brake pad with a vacuum dust collector to minimize the hazard of air borne
particles or other materials.
CAUTION:
• While removing cylinder body, do not depress brake pedal because piston will pop out.
• It is not necessary to disconnect brake hose connection except for disassembly or replacement of caliper assembly. In this case, ha ng cylinder body with a wire so as not to stretch brake hose.
• Do not damage piston boot.
• If any shim is subject to serious corrosion, replace it with a new one.
• Always replace shim and shim cover as a set when replacing brake pads.
• Keep rotor free from brake fluid.
• Burnish the brake pads and disc rotor mutually contacting surfaces, after refinishing or replacing
rotors, after replacing pads, or if a soft pedal occurs at very low mileage.
REMOVAL
1. Partially drain brake fluid. Refer to BR-17, "Drain and Refill".
2. Remove rear wheel and tires using power tools. Refer to WT-41, "
Adjustment".
3. Remove the sliding pin bolt from the cylinder body. Refer to BR-35, "
Exploded View of Brake Caliper".
4. Remove the cylinder body secure with wire and remove pads.
INSTALLATION
1. Push piston in using suitable tool. CAUTION:
1. Outer pad 2. Inner pad
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Revision: December 20092009 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 M-77 grease to knuckle slide where brake pad contacts. 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 sliding pin bolt and tighten to specification. Refer to BR-35, "
Exploded View of Brake Caliper"
6. Check rear disc brake for drag and correct as necessary.
7. Install rear wheel and tires. Refer to WT-41, "
Adjustment".
8. Check brake fluid level. Refer to BR-17, "
On Board Inspection".
Brake Burnishing ProcedureINFOID:0000000004057219
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:0000000004057220
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Revision: December 20092009 QX56

BR-36
< ON-VEHICLE REPAIR >
REAR DISC BRAKE
Removal and Installation of Brake Caliper and Disc Rotor
INFOID:0000000004057221
WARNING:
Clean dust on caliper and brake pad with a vacuum dust collector to minimize the hazard of air borne
particles or other materials.
CAUTION:
• While removing cylinder body, do not depress brake pedal because piston will pop out.
• Do not damage piston boot.
• Keep rotor free from brake fluid.
• Refill with new specified brake fluid.
• Burnish brake contact surface after refinishing or re placing rotors, after replacing pads, or it a soft
pedal occurs at very low mileage. Refer to BR-35, "
Brake Burnishing Procedure".
REMOVAL
1. Remove rear wheel and tires using power tools. Refer to WT-41, "Adjustment".
2. Fasten disc rotor using wheel nut.
3. Drain brake fluid as necessary. Refer to BR-17, "
Drain and Refill".
4. Remove union bolt and cylinder body bolts, then remove cylin- der body.
NOTE:
Discard the copper washers, do not reuse.
5. Apply matching marks to disc rotor and wheel hub assembly 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 disc rotor on the wheel hub assembly, then install
disc rotor using a wheel nut to hold it in place.
CAUTION:
Use matching marks on wheel hub assembly and di sc rotor if the disc rotor is to be reused.
2. Install cylinder body and tighten cylinder body bolts to specification. CAUTION:
Before installing cylinder body to the vehic le, wipe off mating surface of cylinder body.
3. Install brake hose to cylinder body with new copper washers and tighten union bolt to specification.
CAUTION:
• Do not reuse copper washers.
• Securely attach brake hose to projection on cylinderbody.
4. Refill with new brake fluid and bleed. Refer to BR-17, "
Bleeding
Brake System".
5. Check rear disc brake for drag and correct as necessary.
6. Install rear wheel and tires. Refer to WT-41, "
Adjustment".
1. Union bolt2. 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
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Revision: December 20092009 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 sliding pins, bushing and sliding pin boots to torque member.
6. Install cylinder body. Tighten sliding pin bolts to the specified torque.
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Revision: December 20092009 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.
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.
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Revision: December 20092009 QX56