2007 INFINITI QX56 Factory Service Manual

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Page 913 of 3061

INFINITI QX56 2007 Factory Service Manual BRAKE BOOSTER
BR-15
< SERVICE INFORMATION >
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BRAKE BOOSTER
On-Vehicle ServiceINFOID:0000000003532734
OPERATING CHECK
With engine stopped, change the vacuum to the atmosp

Page 914 of 3061

INFINITI QX56 2007 Factory Service Manual BR-16
< SERVICE INFORMATION >
BRAKE BOOSTER
• 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.

BR-16
< SERVICE INFORMATION >
BRAKE BOOSTER
• 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.
1. Remove engine room cover with power tool. Refer to EM-12, "
Removal and Installation" .
2. Remove engine air duct assembly. Refer to EM-15, "
Removal and Installation" .
3. Remove brake piping from brake master cylinder.
4. Remove brake master cylinder. Refer to BR-13, "
Removal and Installation" .
5. Remove vacuum hose from brake booster. Refer to BR-17
.
6. Disconnect active boost and delta stroke sensor harness connectors from brake booster assembly.
7. Remove brake pedal attachment snap pin and clevis pin from inside the vehicle.
8. Remove nuts on brake booster and brake pedal assembly.
9. Remove brake booster assembly from dash panel.
INSPECTION AFTER REMOVAL
Output Rod Length Inspection
1. Using a handy 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 rod length so that the length B (in
the figure) satisfies the specified value.
2. After adjusting “B”, temporarily tighten lock nut and install
booster assembly to the vehicle.
• Install a gaskets and spacer block between booster assembly
and the dash panel.
3. Connect brake pedal with clevis of input rod.
4. Install pedal bracket mounting nuts and tighten them to the
specified torque.
5. Install brake piping from brake master cylinder to ABS actuator. Refer to BR-10, "
Hydraulic Circuit".
6. Connect active boost and delta stroke sensor harness connectors to brake booster assembly.
7. Connect vacuum hose to brake booster.
8. Install master cylinder to booster assembly. Refer to BR-13, "
Removal and Installation" .
9. Adjust the height and play of brake pedal.
10. Tighten lock nut of input rod to specification.
11. Install engine air duct assembly. Refer to EM-15, "
Removal and Installation" .
12. Install engine room cover with power tool. Refer to EM-12, "
Removal and Installation" .
13. Refill with new brake fluid and bleed air. Refer to BR-8, "
Bleeding Brake System" .
SBR208E
Standard dimension : 15.6 − 15.9 mm (0.614 − 0.626 in)
[when vacuum is – 66.7 kPa (– 500 mmHg, – 19.69 inHg)]
Length “B” : 151 mm (5.94 in)
WFIA0382E

Page 915 of 3061

INFINITI QX56 2007 Factory Service Manual VACUUM LINES
BR-17
< SERVICE INFORMATION >
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VACUUM LINES
Removal and InstallationINFOID:0000000003532736
1. Disconnect vacuum hose from hose clip.
2. Release clamps and

Page 916 of 3061

INFINITI QX56 2007 Factory Service Manual BR-18
< SERVICE INFORMATION >
FRONT DISC BRAKE
FRONT DISC BRAKE
On-vehicle InspectionINFOID:0000000003532738
PAD WEAR INSPECTION
• Inspect the thickness of pad through cylinder body inspection hole.

Page 917 of 3061

INFINITI QX56 2007 Factory Service Manual FRONT DISC BRAKE
BR-19
< SERVICE INFORMATION >
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WARNING:
Clean dust on cylinder body and brake pads with a vacuum dust collector to minimize the hazard of
airborne parti

FRONT DISC BRAKE
BR-19
< SERVICE INFORMATION >
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WARNING:
Clean dust on cylinder body and brake pads with a vacuum dust collector to minimize the hazard of
airborne particles or other materials.
CAUTION:
• While removing cylinder body never 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 cylinder body. In this case, hang cylinder body with a wire so as not to stretch brake
hose.
• Do not damage piston boot.
• Burnish brake contact surface after refinishing or replacing rotors, after replacing pads, or if a soft
pedal occurs at very low mileage. Refer to BR-20, "
Disassembly and Assembly of Brake Caliper".
Removal and Installation of Brake PadINFOID:0000000003532740
REMOVAL
1. Remove tires from vehicle using power tool.
2. Remove lower sliding pin bolt.
3. Suspend cylinder body with a wire and remove pads, shims and pad retainers from torque member.
INSTALLATION
1. Push pistons in so that pad is firmly installed and mount cylinder body to torque member.
CAUTION:
By pushing in piston, brake fluid returns to master cylinder reservoir tank. Watch the level of the
surface of reservoir tank.
NOTE:
Using a disc brake piston tool (commercial service tool), makes it easier to push in piston.
2. Attach pad retainers, pads and shims to torque member.
• Apply Molykote M-77 grease to pad retainer where brake pad
contacts and between pad and shim.
CAUTION:
• When attaching pad retainer, attach it firmly so that it is
seated fully in the torque member as shown.
• Do not get grease on the brake rotor friction surface.
3. Install lower sliding pin bolt and tighten it to the specified torque. Refer to BR-18, "
Component" .
4. Check brake for drag.
5. Install tires to the vehicle. Refer to WT-7, "
Rotation".
Removal and Installation of Brake Caliper and Disc RotorINFOID:0000000003532741
REMOVAL
1. Remove tires from vehicle using power tool.
2. Drain brake fluid as necessary. Refer to BR-8, "
Drain and Refill".
NOTE:
Do not remove union bolt unless removing cylinder body from vehicle.
3. Remove torque member bolts.
NOTE:
Position cylinder body aside using suitable wire, as necessary.
NOTE:
When servicing cylinder body, remove sliding pin bolts and torque member from cylinder body.
B. Brake fluid M. Molykote M-77 grease R. Rubber grease
⇐Vehicle front
PFIA0273E

Page 918 of 3061

INFINITI QX56 2007 Factory Service Manual BR-20
< SERVICE INFORMATION >
FRONT DISC BRAKE
4. Remove disc rotor.
INSTALLATION
CAUTION:
• Refill with new brake fluid. Refer to MA-10
.
• Do not reuse drained brake fluid.
1. Install disc roto

Page 919 of 3061

INFINITI QX56 2007 Factory Service Manual FRONT DISC BRAKE
BR-21
< SERVICE INFORMATION >
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4. Using a flat-bladed screwdriver, remove piston seal from cylin-
der body.
CAUTION:
Be careful not to damage cylinder i

Page 920 of 3061

INFINITI QX56 2007 Factory Service Manual BR-22
< SERVICE INFORMATION >
FRONT DISC BRAKE
2. Apply clean brake fluid to piston boot. Cover the piston end with
piston boot, and then install cylinder side lip on piston boot
securely into a groov

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