Infiniti QX4 (R50). Manual — part 99
Hydraulic Circuit
NBBR0010
SBR374DA
SBR375DE
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
BRAKE HYDRAULIC LINE
Hydraulic Circuit
BR-9
SBR992
Removal
NBBR0011
CAUTION:
I
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.
I
All hoses must be free from excessive bending, twisting
and pulling.
1.
Connect vinyl tube to air bleeder valve.
2.
Drain brake fluid from each air bleeder valve by depressing
brake pedal.
3.
Remove flare nut connecting brake tube and hose, then with-
draw lock spring.
4.
Cover openings to prevent entrance of dirt whenever discon-
necting brake line.
Inspection
NBBR0012
Check brake lines (tubes and hoses) for cracks, deterioration or
other damage. Replace any damaged parts.
SBR686C
Installation
NBBR0013
CAUTION:
I
Refill with new brake fluid “DOT 3”.
I
Never reuse drained brake fluid.
1.
Tighten all flare nuts and connecting bolts.
Flare nut:
: 15 - 17 N·m (1.5 - 1.8 kg-m, 11 - 13 ft-lb)
Connecting bolt:
: 17 - 19 N·m (1.7 - 2.0 kg-m, 12 - 14 ft-lb)
2.
Refill until new brake fluid comes out of each air bleeder valve.
3.
Bleed air. Refer to “Bleeding Brake System”, BR-8.
BRAKE HYDRAULIC LINE
Removal
BR-10
SBR822BA
Inspection
NBBR0116
SBR823BA
SBR705AA
CAUTION:
I
Carefully monitor brake fluid level at master cylinder.
I
Use new brake fluid “DOT 3”.
I
Be 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.
I
Depress pedal slowly when raising front brake pressure.
I
Check rear brake pressure 2 seconds after front brake
pressure reaches specified value.
I
Disconnect 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/cm
2
, psi)
Applied pressure (Front brake)
D
1
6,375 (65, 924)
Output pressure (Rear brake)
D
2
3,432 - 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 “Bleeding Brake
System”, BR-8.
7.
Install front LH tire.
Removal and Installation (Built-in type)
NBBR0117
Always replace together with master cylinder as an assembly.
I
Refer to “MASTER CYLINDER”, BR-16.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
PROPORTIONING VALVE (2WD)
Inspection
BR-11
Inspection
NBBR0014
CAUTION:
I
Carefully monitor brake fluid level at master cylinder.
I
Use new brake fluid “DOT 3”.
I
Be 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.
I
Depress pedal slowly when raising front brake pressure.
I
Check rear brake pressure 2 seconds after front brake
pressure reaches specified value.
I
Disconnect harness connectors from ABS actuator and
electric unit before checking.
SBR212E
1.
Park vehicle on a level surface with vehicle unloaded*.
* Fuel, radiator coolant and engine oil full. Spare tire, jack,
hand tools and mats in designated positions.
2.
Press a lever to the stopper bolt, then check length “B” as fol-
lows:
Length “B”
Reference (Length “L”)
207.7 mm (8.18 in)
217.3 mm (8.56 in)
3.
If length “B” is not within specification, adjust sensor spring
length.
Removal and Installation
NBBR0015
CAUTION:
I
Refill with new brake fluid “DOT 3”.
I
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.
I
Do not reuse Load Sensing Valve once it is disassembled.
I
Replace damaged Load Sensing Valve as an assembly.
I
When disassembling, apply multi-purpose grease to all
rubbing areas.
LOAD SENSING VALVE (4WD)
Inspection
BR-12
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