Nissan Terrano model r20 series 2004. Instruction — part 303
ABS actuator operation
Inlet solenoid
valve
Outlet solenoid
valve
Normal brake operation
OFF (Open)
OFF (Closed)
Master cylinder brake fluid pressure is directly trans-
mitted to caliper via the inlet solenoid valve.
ABS operation
Pressure hold
ON (Closed)
OFF (Closed)
Hydraulic circuit is shut off to hold the caliper brake
fluid pressure.
Pressure
decrease
ON (Closed)
ON (Open)
Caliper brake fluid is sent to reservoir via the outlet
solenoid valve. Then it is pushed up to the master
cylinder by pump.
Pressure
increase
OFF (Open)
OFF (Closed)
Master cylinder brake fluid pressure is transmitted to
caliper.
ANTI-LOCK BRAKE SYSTEM
System Description (Cont’d)
BR-42
Removal and Installation
CAUTION:
Be careful not to damage sensor edge and sensor rotor teeth.
When removing the front or rear wheel hub assembly, discon-
nect the ABS wheel sensor from the assembly and move it
away.
FRONT WHEEL SENSOR
REAR WHEEL SENSOR
NBR122
YBR455
ANTI-LOCK BRAKE SYSTEM
BR-43
FRONT SENSOR ROTOR
Removal
1. Remove the drive shaft and rear wheel hub. Refer to “Front axle
— drive shaft” in FA section and “Rear axle” in RA section.
2. Remove the sensor rotor using suitable puller, drift and bear-
ing replacer.
Installation
Install the sensor rotor. For front sensor rotor, use hammer and
wooden block. For rear sensor rotor, use suitable drift and press.
I
Always replace sensor rotor with new one.
YBR295
YBR296
ANTI-LOCK BRAKE SYSTEM
Removal and Installation (Cont’d)
BR-44
REAR SENSOR ROTOR
Removal
I
Remove the sensor rotor using Tool.
Installation
Install the sensor rotor using suitable drift and press.
I
Always replace sensor rotor with new one.
I
Pay attention to the direction of front sensor rotor as shown in
figure.
CONTROL UNIT
Location: Built-in ABS actuator.
When disconnecting the harness connector, pull the lever as
shown in figure.
G SENSOR
Always replace G sensor if bumped or dropped. Otherwise,
performance characteristics of G sensor will be changed,
which in turn alters ABS control performance characteristics.
SBR401D
SBR402D
NBR212
NBR127
ANTI-LOCK BRAKE SYSTEM
Removal and Installation (Cont’d)
BR-45
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