INFINITI QX56 2009 Factory Service Manual

FRONT DISC BRAKEBR-31
< ON-VEHICLE REPAIR >
C
DE
G H
I
J
K L
M A
B
BR
N
O P
Exploded View of Brake CaliperINFOID:0000000005856030
Removal and Installation of Brake Caliper and RotorINFOID:0000000005856031
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 using power tool.
2. Fasten disc rotor using wheel nut.
3. Drain brake fluid. Refer to CO-11, "
Changing Engine Coolant".
4. Remove union bolt, and then disconnect brake hose from caliper assembly.
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 B: Brake fluid
R: Rubber grease
AWFIA0683GB
Revision: December 20092009 QX56

BR-32
< ON-VEHICLE REPAIR >
FRONT DISC BRAKE
NOTE:
Discard the copper washers, do not reuse.
5. Remove torque member bolts, and remove brake caliper assembly.
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, 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
SFIA2437E
Revision: December 20092009 QX56

FRONT DISC BRAKEBR-33
< ON-VEHICLE REPAIR >
C
DE
G H
I
J
K L
M A
B
BR
N
O P
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.
4. Refill with new brake fluid and bleed air. Refer to BR-17, "
Drain and Refill".
5. Check front disc brake for drag and correct as necessary.
6. Install front wheel and tires.
SFIA2431E
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
AWFIA0676ZZ
Revision: December 20092009 QX56

REAR DISC BRAKEBR-35
< ON-VEHICLE REPAIR >
C
DE
G H
I
J
K L
M A
B
BR
N
O P
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
AWFIA0684GB
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
LFIA0211E
SFIA1137E
Revision: December 20092009 QX56

BRAKE MASTER CYLINDERBR-37
< DISASSEMBLY AND ASSEMBLY >
C
DE
G H
I
J
K L
M A
B
BR
N
O P
DISASSEMBLY AND ASSEMBLY
BRAKE MASTER CYLINDER
Disassembly and AssemblyINFOID:0000000004045487
DISASSEMBLY
CAUTION:
• Master cylinder assembly cannot be disassembled.
• Do not drop parts. If a part is dropped, do not use it.
1. Pull the reservoir tank off the master cylinder assembly.
2. Remove the grommets from master cylinder assembly and discard the grommets. CAUTION:
Discard the grommets, do not reuse.
3. Remove the fluid level sensor from the reservoir tank.
4. Remove the front and rear pressure sensors and discard. CAUTION:
Discard the front and rear pressure sensors, do not reuse.
ASSEMBLY
CAUTION:
• Never use mineral oil such as kerosene, g asoline during the cleaning and assembly process.
• Do not drop parts. If a part is dropped, do not use it.
1. Reservoir cap 2. Fluid level sensor3. Grommet
4. Master cylinder assembly 5. Rear pressure sensor 6. Front pressure sensor
7. Seal 8. Reservoir tankB. Brake fluid
R. Rubber grease
AWFIA0415GB
Revision: December 20092009 QX56

BR-38
< DISASSEMBLY AND ASSEMBLY >
BRAKE MASTER CYLINDER
1. Apply brake fluid or rubber grease to the new grommets, then insert the new grommets into the mastercylinder assembly.
CAUTION:
Do not reuse the grommets.
2. Install the reservoir tank onto the master cylinder assembly.
3. Install the fluid level sensor on the reservoir tank.
4. Install the new front and rear pressure sensors. CAUTION:
Do not reuse the front and rear pressure sensors.
Revision: December 20092009 QX56

FRONT DISC BRAKEBR-39
< DISASSEMBLY AND ASSEMBLY >
C
DE
G H
I
J
K L
M A
B
BR
N
O P
FRONT DISC BRAKE
Disassembly and AssemblyINFOID:0000000005890879
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: December 20092009 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.
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
SFIA2399E
Revision: December 20092009 QX56