NISSAN PICK-UP 1998 Owner's Guide

Removal
WARNING:
Clean brake lining with a vacuum dust collector to minimize
the hazard of airborne materials.
CAUTION:
Make sure parking brake lever is completely released.
1. Release parking brake lever fully, then remove drum.
lIf 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.
b. Install two bolts as shown. Tighten the two bolts gradu-
ally.
2. After removing retainer, remove spring by rotating shoes.
lBe careful not to damage wheel cylinder piston boots.
lBe careful not to damage parking brake cable when
separating it.
3. Remove adjuster.
4. Disconnect parking brake cable from toggle lever.
5. Remove retainer clip with a suitable tool. Then separate
toggle lever and brake shoe.
SBR280B
SBR093A
ABR369
ABR408
REAR DRUM BRAKE
BR-27

Inspection Ð Wheel Cylinder
lCheck wheel cylinder for leakage.
lCheck for wear, damage and loose conditions.
Replace if any such conditions exists.
Wheel Cylinder Overhaul
lCheck all internal parts for wear, rust and damage. Replace
if necessary.
lPay attention not to scratch cylinder when installing pistons.
Inspection Ð Drum
Maximum inner diameter (Repair limit):
LT26B 261.5 mm (10.30 in)
LT30A 296.5 mm (11.67 in)
lContact surface should be finished with No. 120 to 150
emery sandpaper.
lUsing a brake lathe, machine brake drum if it shows score
marks, partial wear or stepped wear.
lAfter brake drum has been completely reconditioned or
replaced, check drum and shoes for proper contact pattern.
Inspection Ð Lining
Check lining thickness.
Standard lining thickness:
LT26B 5.5 mm (0.217 in)
LT30A 6.1 mm (0.240 in)
Lining wear limit (A):
LT26B 1.5 mm (0.059 in)
LT30A 1.5 mm (0.059 in)
Installation
lAlways perform shoe clearance adjustment. Refer to
BR-31.
1. Fit toggle lever to brake shoe with retainer clip.
2. Apply brake grease to the contact areas shown at left.
ABR370
SBR215B
SBR095A
SBR021A
ABR371
REAR DRUM BRAKE
BR-28

3. Shorten adjuster by rotating it.
lPay attention to direction of adjuster.
Wheel Screw
Left Left-hand thread
Right Right-hand thread
4. Connect parking brake cable to toggle lever.
5. Install all parts.
lBe careful not to damage wheel cylinder piston boots.
6. Check all parts are installed properly.
lAfter installation is completed, adjust shoe-to-drum
clearance.
7. Install brake drum.
8. When installing new wheel cylinder or overhauling wheel
cylinder, bleed air. Refer to ``Bleeding Brake System'', BR-4.
9. Adjust parking brake. Refer to BR-31.
lInstall all the parts by referring to the figure below.
LT30A model
lAfter installing crank lever on back plate, make sure that
there is no play between crank lever and back plate. If play
exists, adjust bolt
VAand lock nutVB.
ABR396
ABR372
SBR099A
SBR100CA
REAR DRUM BRAKE
Installation (Cont'd)
BR-29

SBR312E
PARKING BRAKE CONTROL
BR-30

Removal and Installation
lBe careful not to damage cable.
lMake sure there is no free play after installation.
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. Correct if necessary.
4. Check part at each connecting portion and, if found deformed
or damaged, replace.
Adjustment
Adjust parking brake as follows:
1. Fully release parking brake lever.
2. Loosen
VAand rotateVBuntil parking brake cable loosen.
3. Depress brake pedal several times until clicking sound does
not occur from rear brakes.
4. Adjust clearance between rear brake shoe and drum.
5. Adjust parking brake lever stroke by rotating
VB.
6. Pull parking brake lever with specified force. Check lever
stroke and ensure smooth operation.
7. Readjust clearance between rear brake shoe and drum.
SBR980D
SBR981D
SBR977D
PARKING BRAKE CONTROL
BR-31

Purpose
The Anti-Lock Brake System (ABS) consists of electronic and hydraulic components. It allows for control of
braking force so locking of the wheels can be avoided.
The ABS:
1) Improves proper tracking performance through steering wheel operation.
2) Eases obstacle avoidance through steering wheel operation.
3) Improves vehicle stability.
Operation
lWhen the vehicle speed is less than 10 km/h (6 MPH) this system does not work.
lThe Anti-Lock Brake System (ABS) has a self-test function. The system turns on the ABS warning lamp
for 1 second each time the ignition switch is turned ``ON''. After the engine is started, the ABS warning
lamp turns off. The system performs a test the first time the vehicle reaches 6 km/h (4 MPH). A
mechanical noise may be heard as the ABS performs this self-test. This is a normal part of the self-test
feature. If a malfunction is found during this check, the ABS warning lamp will stay on.
lWhile driving, a mechanical noise may be heard during ABS operation. This is a normal condition.
ABS Hydraulic Circuit
V1Inlet solenoid valve
V2Outlet solenoid valve
V3Pump
V4Motor
V5Inlet valve
V6Outlet valve
V7Bypass check valve
V8Damper
SBR316E
ANTI-LOCK BRAKE SYSTEM
BR-32

System Components
System Description
WHEEL SENSOR
The sensor unit consists of a gear-shaped sensor rotor and a
sensor element. The element contains a bar magnet around
which a coil is wound. The sensor is installed on the back of the
brake rotor and the front of the differential (2WD) or the back of
the rear brake drum (4WD). As the wheel rotates, the sensor
generates a sine-wave pattern. The frequency and voltage
increase(s) as the rotating speed increases.
CONTROL UNIT (built in ABS actuator and electric
unit)
The control unit computes the wheel rotating speed by the sig-
nal current sent from the sensor. Then it supplies a DC current
to the actuator solenoid valve. It also controls ON-OFF operation
of the valve relay and motor relay. If any electrical malfunction
should be detected in the system, the control unit causes the
warning lamp to light up. In this condition, the ABS will be deac-
tivated by the control unit, and the vehicle's brake system reverts
to normal operation. (For control unit layout, refer to ABS
ACTUATOR AND ELECTRIC UNIT, BR-34.)
SBR068E
SBR069E
ANTI-LOCK BRAKE SYSTEM
BR-33

G SENSOR (4WD models only)
The G sensor senses deceleration during braking to determine whether the vehicle is being driven on a high
 road (asphalt road, etc.) or a low  road (snow-covered road, etc.). It then sends a signal to the ABS con-
trol unit.
The reed switch turns on when it is affected by a magnetic field. During sudden deceleration (braking on a
high  road), the weight moves and the magnet in the weight moves away from the reed switch. The mag-
netic field then diminishes and the reed switch turns off.
ABS ACTUATOR AND ELECTRIC UNIT
The ABS actuator and electric unit contains:
lAn electric motor and pump
lTwo relays
lSix solenoid valves, each inlet and outlet for
Ð LH front
Ð RH front
Ð Rear
lABS 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 are not disassemble.
ABS actuator operation
Inlet solenoid
valveOutlet solenoid
valve
Normal brake operation OFF (Open) OFF (Closed)Master cylinder brake fluid pressure is directly trans-
mitted to wheel cylinder via the inlet solenoid valve.
ABS operationPressure hold ON (Closed) OFF (Closed)Hydraulic circuit is shut off to hold the wheel cylinder
brake fluid pressure.
Pressure
decreaseON (Closed) ON (Open)Wheel cylinder brake fluid is sent to reservoir via the
outlet solenoid valve. Then it is pushed up to the
master cylinder by pump.
Pressure
increaseOFF (Open) OFF (Closed)Master cylinder brake fluid pressure is transmitted to
wheel cylinder.
SBR070E
SBR071E
ANTI-LOCK BRAKE SYSTEM
System Description (Cont'd)
BR-34

Removal and Installation
CAUTION:
Be careful not to damage sensor edge and sensor rotor
teeth.
When removing the front wheel hub or rear axle shaft
assembly, disconnect the ABS wheel sensor from the
assembly and move it away.
FRONT WHEEL SENSOR
SBR311E
ANTI-LOCK BRAKE SYSTEM
BR-35

REAR WHEEL SENSOR
SBR073E
ANTI-LOCK BRAKE SYSTEM
Removal and Installation (Cont'd)
BR-36