brake INFINITI QX56 2010 Factory Workshop Manual

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 front wheel and tire using power tool. Refer to WT-49, "
Rotation".
Removal and Installation of Rear Brake Piping and Brake HoseINFOID:0000000005147907
REMOVAL
1. Remove rear wheel and tire using power tool.
2. Remove brake reservoir cap.
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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 using power tool. Refer to WT-49, "
Rotation".
Inspection After InstallationINFOID:0000000005147908
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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LFIA0212E
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Revision: April 20092010 QX56

BR-24
< ON-VEHICLE REPAIR >
BRAKE TUBE AND HOSE
1. Check brake lines (tubes and hoses), and connections for fluid leaks, damage, twist, deformation, contact
with other parts, and loose connections. Replace any parts as necessary. Refer to BR-13, "
Hydraulic Cir-
cuit".
2. While depressing brake pedal under a force of 785 N (80 kg-f, 177 lb-f) with engine running for approxi- mately 5 seconds, check each part for fluid leaks.
Revision: April 20092010 QX56

BRAKE MASTER CYLINDERBR-25
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BRAKE MASTER CYLINDER
Removal and InstallationINFOID:0000000005147909
REMOVAL
CAUTION:
• 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.
• Before removing brake master cylinder, depress the brake pedal 5-6 times with the key OFF to deplete vacuum in the booster.
1. Remove brake reservoir cap.
2. Disconnect harness connectors for fluid level sensor, front and rear pressure sensors.
3. Using suitable tool, disconnect brake tube from master cylinder assembly.
4. Remove master cylinder assembly nuts, and remove master cylinder assembly.
INSTALLATION
Installation is in the reverse order of removal.
• Refill brake fluid and bleed air. Refer to BR-17, "
Bleeding Brake System".
CAUTION:
• Refill with new brake fluid. Refer to MA-13, "
Fluids and Lubricants".
• Do not reuse drained brake fluid.
• Adjust brake pedal. Refer to BR-15, "
Inspection and Adjustment" .
1. Reservoir cap 2. Fluid level sensor3. Grommet
4. Master cylinder assembly 5. Front pressure sensor 6. Rear pressure sensor
7. Seal 8. Reservoir tankB. Brake fluid
R. Rubber grease
AWFIA0415GB
Revision: April 20092010 QX56

BR-26
< ON-VEHICLE REPAIR >
BRAKE BOOSTER
BRAKE BOOSTER
Removal and InstallationINFOID:0000000005147910
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 engine room cover. Refer to EM-24, "Removal and Installation".
2. Remove engine air duct assembly. Refer to EM-25, "
Removal and Installation".
3. Remove cowl top extension. Refer to EXT-18, "
Removal and Installation".
4. Remove master cylinder assembly from brake booster. Refer to BR-25, "
Removal and Installation".
5. Remove vacuum hose from brake booster. Refer to BR-28, "
Removal and Installation".
6. Disconnect active boost and delta stroke s ensor harness connectors from brake booster.
7. Remove instrument lower panel LH. Refer to IP-14, "
Exploded View".
8. Remove brake pedal to clevis attachment snap pin and clevis pin from inside the vehicle.
9. Remove brake booster to brake pedal assembly nuts.
10. Reposition the A/C line out of the way.
11. Remove brake booster and spacer block from dash panel.
INSPECTION AFTER REMOVAL
Output Rod Length Inspection
1. Reservoir tank 2. Master cylinder assembly 3. Gasket
4. Brake pedal 5. Lock nut 6. Spacer block
7. Brake booster 8. Active booster 9. Delta stroke sensor
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BRAKE BOOSTERBR-27
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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 boost 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 instrument lower panel LH. Refer to IP-14, "
Removal and Installation".
11. Secure A/C line into clips.
12. Install cowl top extension. Refer to EXT-18, "
Removal and Installation".
13. Install engine air duct assembly. Refer to EM-25, "
Removal and Installation".
14. Install engine room cover. Refer to EM-24, "
Removal and Installation".
15. 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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BR-28
< ON-VEHICLE REPAIR >
VACUUM LINES
VACUUM LINES
Removal and InstallationINFOID:0000000005147911
REMOVAL
1. Remove engine room cover. Refer to EM-24, "Removal and Installation".
2. Disconnect vacuum hose from hose clip.
3. Release clamps and disconnect vacuum hose.
4. Remove check valve from brake booster.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Insert vacuum hose for at least 24 mm (0.94 in).
• Do not use lubricating oil during assembly.
1. Hose clip 2. Clamp3. Vacuum hose
4. Check valve
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SBR225B
Revision: April 20092010 QX56

FRONT DISC BRAKEBR-29
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FRONT DISC BRAKE
Exploded View of Brake PadsINFOID:0000000005147912
Removal and Installation of Brake PadsINFOID:0000000005147913
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 bod y, do not depress brake pedal because piston will pop out.
• It is not necessary to remove bolts on torque member and brake hose except for disassembly or replacement of caliper assembly. In this case, hang 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 so ft pedal occurs at very low mileage.
REMOVAL
1. Remove front wheel and tires. Refer to WT-49, "Rotation".
2. Partially drain some brake fluid from the reservoir.
3. Remove the sliding pin bolts.
1. Inner multi-layered shim 2. Pad wear sensor 3. Pad retainer
4. Outer shim cover 5. Outer shim6. Outer pad
7. Inner pad 1: Molykote M-77 grease
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Revision: April 20092010 QX56

BR-30
< ON-VEHICLE REPAIR >
FRONT DISC BRAKE
4. Hang cylinder body with a wire, and remove pads, pad retainers,shims, and shim cover 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 pistons in using suitable tool.
CAUTION:
By pushing in pistons, brake fluid returns to m aster cylinder reservoir tank. Watch the brake fluid
level in the reservoir tank.
NOTE:
Using a suitable tool, makes it easier to push in the pistons.
2. Apply Molykote M-77 grease or equivalent to between shim cover and shim. Install outer shim, outer shim cover to inner pad, and inner multi-layered shim to outer pad.
3. Apply Molykote M-77 grease or equivalent to between pad retainer and pad. Install pad retainers and pads to torque member.
4. Apply Molykote M-77 grease or equivalent to the piston face. Install pad return lever securely to pad wear sensor as shown.
CAUTION:
• Securely assemble pad retainers so that they are 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.
5. Install pads to cylinder body.
6. Install cylinder body to torque member. 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.
7. Apply rubber grease and install sliding pin bolts, and tighten to the specified torque. Refer to BR-31,
"Exploded View of Brake Caliper".
8. Check front disc brake for drag.
9. Install front wheel and tires. Refer to WT-49, "
Rotation".
Brake Burnishing ProcedureINFOID:0000000005147914
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
SBR557E
Revision: April 20092010 QX56

FRONT DISC BRAKEBR-31
< ON-VEHICLE REPAIR >
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Exploded View of Brake CaliperINFOID:0000000005147915
Removal and Installation of Brake Caliper and RotorINFOID:0000000005147916
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 bod y, 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 replacing rotors, after replacing pads, or it a soft
pedal occurs at very low mileage. Refer to BR-30, "
Brake Burnishing Procedure".
REMOVAL
1. Remove front wheel and tire. Refer to WT-49, "Rotation".
2. Fasten disc rotor using wheel nut.
3. Remove brake reservoir cap.
4. Remove union bolt, and then disconnect brake hose from caliper assembly. NOTE:
Discard the copper washers, do not reuse.
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. Washers 11. Bushing 12. Sliding pin
13. Piston boot 14. Piston 15. Piston seal
16. Cylinder body Brake fluid1: Molykote M-77 grease
2: Rubber grease
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Revision: April 20092010 QX56