Nissan Primera P11. Manual — part 43
Inspection
1. Check control lever for wear or other damage. Replace if
necessary.
2. Check wires for discontinuity or deterioration. Replace if nec-
essary.
3. Check warning lamp and switch. Replace if necessary.
4. Check parts at each connecting portion and, if found
deformed or damaged, replace the parts.
Adjustment
Before or after adjustment, pay attention to the following points.
●
Make sure the toggle lever of the rear disc brakes returns to
stopper, when the parking lever is released.
●
There is no drag when parking brake lever is released.
●
Vehicle is unladen.
1. Adjust clearance between shoe and drum or pad and rotor
as follows:
a. Release parking brake lever and loosen adjusting nut.
b. Depress brake pedal fully at least 10 times with engine run-
ning.
2. Pull control lever 10 times or more to make a lever stroke of
203.5 mm (8.01 in). At 6 - 8 notches, adjust the parking brake
cable by turning the adjusting nut.
3. Pull control lever with the specified amount of force. Check
lever stroke and ensure smooth operation.
Number of notches
6 - 8
4. Bend warning lamp switch plate to ensure:
●
Warning lamp comes on when lever is lifted “A” notches.
●
Warning lamp goes out when lever is fully released.
Number of “A” notches: 1
SBR768E
Stopper bolt
Lever
SBR756E
Adjusting nut
SBR033A
196 N (20 kg, 44 lb)
PARKING BRAKE CONTROL
BR-49
Purpose
The Anti-Lock Brake System (ABS) consists of electronic and hydraulic components. It allows for control of
braking force so that locking of the wheels can be avoided.
The ABS:
1) Provides improved steering control during braking (by preventing front wheel lock).
2) Provides improved vehicle stability and skid prevention during braking (by avoiding rear wheel lock).
Operation
●
When the vehicle speed is less than 10 km/h (6 mph) this system does not work.
●
The Anti-Lock Brake System (ABS) has self-test capabilities. The system turns on the ABS warning light
for 1 second after turning the ignition switch to the “ON” position. The system performs another test the
first time the vehicle reaches 6 km/h (4 mph). A mechanical noise may be heard as the ABS performs
a self-test. This is a normal part of the self-test feature. If a malfunction is found during this check, the
ABS warning light will come on.
●
During ABS operation, a mechanical noise may be heard. This is a normal operating condition.
ABS Hydraulic Circuit
p
1
Inlet solenoid valve
p
2
Outlet solenoid valve
p
3
Reservoir
p
4
Pump
p
5
Motor
p
6
Bypass check valve
p
7
Damper
NBR259
Rear LH
wheel
Front RH
wheel
Front LH
wheel
Rear RH
wheel
ANTI-LOCK BRAKE SYSTEM
BR-50
System Components
System Description
SENSOR
The sensor unit consists of a gear-shaped sensor rotor and an
electro-magnetic proximity detector. The proximity detector
(“pick-up”) contains a bar magnet around which a coil is wound.
The detector is installed on the back side of the brake rotor. An
alternating voltage is generated in the coil of the proximity detec-
tor as each tooth of the rotor cuts the magnetic field of the
detector core. The frequency and amplitude of the voltage
increases in proportion to the rotational speed of the rotor.
CONTROL UNIT
The control unit determines the wheel rotating speed from the
signal sent from the sensor, a corresponding control signal is
then output from the control unit in the form of a DC current to
the actuator solenoid valve. The ABS control unit also controls
ON-OFF operation of the valve relay and motor relay. If any
electrical malfunction should be detected in the system, the con-
trol unit causes the warning lamp to light up. In this condition, the
ABS will be deactivated by the control unit, and the vehicle’s
brake system reverts to normal operation.
NBR260
Warning light
Brake tube connector
Actuator
Front wheel sensors
Control unit
Rear wheel sensors
SBR124B
Control unit
Magnet
.
Sensor (proxi-
mity detector)
Magnetic flux
Tooth
V: Induced electromotive force
Moving time of one tooth
Sensor rotor
Coil
Low carbon steel
NBR284
ABS warning light
ANTI-LOCK BRAKE SYSTEM
BR-51
ABS ACTUATOR AND ELECTRIC UNIT
The ABS actuator and electric unit contains:
●
An electric motor and pump
●
Two relays
●
Eight solenoid valves, each inlet and outlet for
— LH front
— RH front
— Rear LH/RH
●
ABS control unit
This component controls the hydraulic circuit and increases,
holds or decreases hydraulic pressure to all or individual wheels.
The ABS actuator and electric unit can not be disassembled and
has to be serviced as an assembly.
ABS actuator operation
Inlet solenoid
valve
Outlet solenoid
valve
Normal brake operation
OFF (Open)
OFF (Closed)
Master cylinder brake fluid pressure is directly transmit-
ted to wheel cylinder via the inlet solenoid valve.
ABS operation
Pressure hold
ON (Closed)
OFF (Closed)
Hydraulic circuit is shut off to hold the wheel cylinder
brake fluid pressure.
Pressure
decrease
ON (Closed)
ON (Open)
Wheel cylinder brake fluid is sent to reservoir via the
outlet solenoid valve. Then it is pushed up to the mas-
ter cylinder by pump.
Pressure
increase
OFF (Open)
OFF (Closed)
Master cylinder brake fluid pressure is transmitted to
wheel cylinder.
NBR297
ABS control
unit harness
connector
ABS
control unit
.
ABS actuator
ANTI-LOCK BRAKE SYSTEM
System Description (Cont’d)
BR-52
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