wheel INFINITI QX4 2001 Factory Owner's Guide

Supplemental Restraint System (SRS) ªAIR
BAGº and ªSEAT BELT PRE-TENSIONERº
NBBR0001The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to INFINITI QX4 is as follows:
IFor a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), seat belt
pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
IFor a side collision
The Supplemental Restraint System consists of side air bag module (located in the outer side of front seat),
satellite sensor, diagnosis sensor unit (one of components of air bags for a frontal collision), wiring harness,
warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in theRS sectionof this Service Manual.
WARNING:
ITo avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be performed
by an authorized INFINITI dealer.
IImproper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the RS section.
IDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation tape either just
before the harness connectors or for the complete harness are related to the SRS.
SBR686C
Precautions for Brake SystemNBBR0002IUse brake fluid ªDOT 3º.
INever reuse drained brake fluid.
IBe 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.
ITo clean master cylinder parts, disc brake caliper parts or
wheel cylinder parts, use clean brake fluid.
INever use mineral oils such as gasoline or kerosene. They
will ruin rubber parts of hydraulic system.
IUse flare nut wrench when removing and installing brake
tubes.
IAlways torque brake lines when installing.
WARNING:
IClean brakes with a vacuum dust collector to minimize
risk of health hazard from powder caused by friction.
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PRECAUTIONS
Supplemental Restraint System (SRS) ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº
BR-3

Special Service ToolsNBBR0004The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
KV40106500
(J25852-B)
Rear wheel bearing
puller
NT724
Removing rear wheel sensor rotor
Commercial Service ToolsNBBR0005
Tool name Description
1 Flare nut crowfoot
2 Torque wrench
NT360
Removing and installing each brake piping
a: 10 mm (0.39 in)
Brake fluid pressure
gauge
NT151
Measuring brake fluid pressure
Rear wheel sensor rotor
drift
NT509
Installing rear wheel sensor rotor
a: 75 mm (2.95 in) dia.
b: 63 mm (2.48 in) dia.
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PREPARATION
Special Service Tools
BR-5

NBBR0085
NVH Troubleshooting ChartNBBR0085S01Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
Reference page
BR-22, 28
BR-22, 28
BR-26
BR-22
Ð
Ð
BR-24, 28
Ð
Ð
Ð
BR-25
BR-28
PD-3
PD-3
AX-3
AX-3
SU-3
SU-3
SU-3
ST-6
Possible cause and
SUSPECTED PARTS
Linings or pads - damaged
Linings or pads - uneven wear
Return spring damaged
Shims damaged
Rotor or drum imbalance
Rotor or drum damage
Rotor or drum runout
Rotor or drum deformation
Rotor or drum deflection
Rotor or drum rust
Rotor thickness variation
Drum out of round
PROPELLER SHAFT
DIFFERENTIAL
DRIVE SHAFT
AXLE
SUSPENSION
TIRES
ROAD WHEEL
STEERING
Symptom BRAKENoise´´´´ ´´´´´´´´
Shake´ ´ ´´´´´´
Shimmy, Judder´´´´´´´´ ´´´´´
´: Applicable
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting Chart
BR-6

SBR822BA
InspectionNBBR0116
SBR823BA
SBR705AA
CAUTION:
ICarefully monitor brake fluid level at master cylinder.
IUse new brake fluid ªDOT 3º.
IBe careful not to splash brake fluid on painted areas; it
may cause paint damage. If brake fluid is splashed on
paint areas, wash it away with water immediately.
IDepress pedal slowly when raising front brake pressure.
ICheck rear brake pressure 2 seconds after front brake
pressure reaches specified value.
IDisconnect harness connectors from ABS actuator and
electric unit before checking.
1. Remove front LH tire.
2. Connect tool to air bleeders on front LH brake caliper and rear
LH or RH brake wheel cylinder.
3. Install front LH tire.
Before installing front LH tire, confirm the tool is not touching
the front LH wheel.
4. Bleed air from the tool.
5. Check fluid pressure by depressing brake pedal.
kPa (kg/cm2, psi)
Applied pressure (Front brake) D16,375 (65, 924)
Output pressure (Rear brake) D
23,432 - 3,825
(35 - 39, 498 - 555)
If output pressure is out of specifications, replace master cylinder
assembly (built-in type).
6. Bleed air after disconnecting the tool. Refer to ªBleeding Brake
Systemº, BR-8.
7. Install front LH tire.
Removal and Installation (Built-in type)NBBR0117Always replace together with master cylinder as an assembly.
IRefer to ªMASTER CYLINDERº, BR-16.
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PROPORTIONING VALVE (2WD)
Inspection
BR-11

SBR824B
1. Loosen lock nut and adjust pedal free height by turning brake
booster input rod. Then tighten lock nut.
Make sure that tip of input rod stays inside.
2. Adjust clearance ªC
1º and ªC2º with stop lamp switch and
ASCD switch respectively. Then tighten lock nuts.
3. Check pedal free play.
Make sure that stop lamp is off when pedal is released.
4. Check brake pedal's depressed height while engine is running.
If depressed height is below specified value, check brake sys-
tem for leaks, accumulation of air or any damage to compo-
nents (master cylinder, wheel cylinder, etc.). Then make nec-
essary repairs.
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BRAKE PEDAL AND BRACKET
Adjustment (Cont'd)
BR-15

SBR085A
DisassemblyNBBR0034WARNING:
Do not place your fingers in front of piston.
CAUTION:
Do not scratch or score cylinder wall.
1. Push out piston with dust seal with compressed air.
2. Remove piston seal with a suitable tool.
InspectionNBBR0035CALIPERNBBR0035S01Cylinder BodyNBBR0035S0101ICheck inside surface of cylinder for score, rust, wear, damage
or presence of foreign objects. If any of the above conditions
are observed, replace cylinder body.
IMinor damage from rust or foreign objects may be eliminated
by polishing surface with a fine emery paper. Replace cylinder
body if necessary.
CAUTION:
Use brake fluid to clean. Never use mineral oil.
PistonNBBR0035S0102Check piston for score, rust, wear, damage or presence of foreign
objects. Replace if any of the above conditions are observed.
CAUTION:
Piston sliding surface is plated. Do not polish with emery
paper even if rust or foreign objects are stuck to sliding sur-
face.
Slide Pin, Pin Bolt and Pin BootNBBR0035S0103Check for wear, cracks, rust or other damage. Replace if any of the
above conditions are observed.
SBR019B
ROTORNBBR0035S02RunoutNBBR0035S02011. Secure rotor to wheel hub with at least two nuts (M12´1.25).
2. Check runout using a dial indicator.
Make sure that wheel bearing axial end play is within the
specifications before measuring. Refer to AX-4, ªFront Wheel
Bearingº.
Maximum runout:
0.1 mm (0.004 in)
3. If the runout is out of specification, find minimum runout posi-
tion as follows:
a. Remove nuts and rotor from wheel hub.
b. Shift the rotor one hole and secure rotor to wheel hub with
nuts.
c. Measure runout.
d. Repeat steps a. to c. so that minimum runout position can be
found.
4. If the runout is still out of specification, turn rotor with on-car
brake lathe (ªMAD, DL-8700º, ªAMMCO 700 and 705º or
equivalent).
FRONT DISC BRAKE
Disassembly
BR-24

ComponentsNBBR0038
SBR757DA
1. Shoe hold pin
2. Plug
3. Back plate
4. Check plug
5. Spring
6. Shoe (leading side)
7. Air bleeder
8. Spring
9. Piston cup10. Piston
11. Boot
12. Retainer ring
13. Toggle lever
14. Wave washer
15. Shoe (trailing side)
16. Adjuster
17. Boot
18. Piston19. Piston cup
20. Wheel cylinder
21. Adjuster lever
22. Spring seat
23. Shoe hold spring
24. Retainer
25. Adjuster spring
26. Return spring (upper)
27. Return spring (lower)
RemovalNBBR0039WARNING:
Clean brake lining with a vacuum dust collector to minimize
the hazard of airborne asbestos or other materials.
CAUTION:
Make sure parking brake lever is released completely.
SBR264CA
1. Release parking brake lever fully, then remove drum.
If drum is hard to remove, the following procedures
should be carried out.
a. Remove plug. Then shorten adjuster to make clearance
between brake shoe and drum as shown.
REAR DRUM BRAKE
Components
BR-26

SBR093A
b. Tighten the two bolts gradually.
SBR266CA
2. After removing shoe hold pin by rotating push retainer, remove
leading shoe then remove trailing shoe. Remove spring by
rotating shoes in direction arrow.
Be careful not to damage wheel cylinder piston boots.
3. Remove adjuster.
SBR267CA
4. Disconnect parking brake cable from toggle lever.
Be careful not to damage parking brake cable when separat-
ing it.
SBR093B
5. Remove retainer ring with a suitable tool. Then separate toggle
lever and brake shoe.
SBR816B
InspectionNBBR0040WHEEL CYLINDERNBBR0040S01ICheck wheel cylinder for leakage.
ICheck for wear, damage and loose conditions.
Replace if any such condition exists.
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REAR DRUM BRAKE
Removal (Cont'd)
BR-27

SBR215B
Wheel Cylinder OverhaulNBBR0041ICheck all internal parts for wear, rust and damage. Replace if
necessary.
IPay attention so as not to scratch cylinder when installing pis-
tons.
SBR095A
InspectionNBBR0042DRUMNBBR0042S01Maximum inner diameter: 296.5 mm (11.67 in)
Out-of-roundness: 0.03 mm (0.0012 in) or less
IContact surface should be fine finished with No. 120 to 150
emery paper.
IUsing a drum lathe, lathe brake drum if it shows scoring, par-
tial wear or stepped wear.
IAfter brake drum has been completely reconditioned or
replaced, check drum and shoes for proper contact pattern.
SBR021A
LININGNBBR0042S02Check lining thickness.
Standard lining thickness:
6.1 mm (0.240 in)
Lining wear limit (A):
1.5 mm (0.059 in)
SBR092B
InstallationNBBR0043Always perform shoe clearance adjustment. Refer to BR-31.
1. Fit toggle lever to brake shoe (trailing side) with retainer ring.
ABR371
2. Apply brake grease to the contact areas (indicated by arrows
and hatching) shown at left.
REAR DRUM BRAKE
Wheel Cylinder Overhaul
BR-28

SBR217B
3. Shorten adjuster by rotating it.
IPay attention to direction of adjuster.
Wheel Screw Depression
Left Left-hand thread Yes
Right Right-hand thread No
SBR279B
4. Connect parking brake cable to toggle lever.
5. Install all parts.
Be careful not to damage wheel cylinder piston boots.
6. Check all parts are installed properly.
Pay attention to direction of adjuster assembly.
7. Install brake drum.
8. When installing new wheel cylinder or overhauling wheel
cylinder, bleed air. Refer to ªBleeding Brake Systemº, BR-8.
9. Adjust parking brake. Refer to ªAdjustmentº, ªPARKING
BRAKE CONTROLº, BR-31.
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REAR DRUM BRAKE
Installation (Cont'd)
BR-29