1977 DATSUN PICK-UP brake light

Condition

Pedal

yields
under

slight
pressure
Brake

System

Probable

cause

Wheel

cylinder
in

poor
condition

Poor

sliding
condition
of
brake
shoe

Looseness
of

cylinder
body
or

back

plate

securing
bolts

Scored
or
out

of
round
drums

Sticking
wheel

cylinder

cups

Deformation
of
back

plate

Incorrect

adjustment
of
wheel

bearings

Incorrect

adjustment
of
wheel

alignment

Looseness
of
leaf

spring
securing
U

bolts

Faulty
N
L

S
V

Deteriorated
check
valve

Ex

ternalleaks

Leakage
on
master

cylinder

BR
24
Corrective
action

Repair
or

replace

Adjust

Fasten
or

replace

Recondition
or

replace
brake

drum
as
reo

quired
Check
for

improper
lining
contact

with
drum
and

grind
lining
if

necessary

Recondition
or

replace
cylinder

Replace

Adjust
or

replace

Adjust

Tighten
or

replace

Replace

Replace
check
valve
and
bleed

system

Check
master

cylinder

piping
and

wheel

cylinder
for
leaks
and

repair

Overhaul
master

cylinder

Center

This

wear
is
caused

by
overinflation

of
the
tire
The
inflation

pressure
must

be

kept
at
the

specified
value

Shoulder

The
wear

may
be
caused

by
under

inflation
incorrect
wheel
camber
or

continuous
high

speed
driving
on

curves
In

general
the
former
two

causes
are
common
Underinflation

wear
occurs
on

both
sides
of

treads

d
I

Ii

Toe
in
or

toe
out
wear

nf
I

Underinnation
wear

TIRE
ROTATION

Tires
wear

unevenly
and
become

unbalanced

according
to

running
dis

tance
Uneven
tire
wear
often
results

in
tire
noise

which
is
attributed
to
rear

axle

gears
bearing
etc
Meanwhile
the

front
tires
tend
to
wear

unevenly

because
of

improperly
aligned
front

wheel

Accordingly
to

equalize
tire
wear

it
is

necessary
to

rotate
tires

peri

odically

All
the
tires

including
the

spare
tire

are
of
the

same

type

Right
front

Right
rear

14
1

I

@
Spare

t
t
1

1

Left

front
Left
rear

Fig
WT
2
Tire
rotation
1
Wheel
and
Tire

and

on
the
other
hand
camber
causes

wear

only
on

one
side
of
treads
For

cornering
tread
wear
the

driver
must

operate
vehicle

slowing
down
on

curves

Uneven

Uneven
wear
is
caused

by
incorrect

camber
or
caster

malfunctioning
sus

pension
unbalanced
wheel
out
of

round

brake
drum
or
other
mechani

cal
conditions
To

repair
this
abnormal

wear

correct
the

above

faulty
parts

J

I

II

i

11
I

1

Overinllation
wear

1

I
I

t

Uneven
wear
WT007

Fig
WT
1
A
bnormal
tire
wear

The

spare
lire
has

a
different
brand

from
4
tires
on

the
vehicle

Right
front

Right
rear

I

@
Spare

x

J
r

Left
front
Left
rear

The

pare
tire
should
be
used

in
an

emergency
only

Fig
WT
3
Tire
rotation
2

The
tires
are

provided
with
tread

wear

indicator
at
six

places
around

tire
circumference
indicating
1

6
mm

J
in
tread

depth
When
the
tires

wear
and
then
the
marks

appear
re

place
them
with

new
ones
See

Figure

WT

4

WT3
Tire
tread

0E
I
Tread

wear
indicator

c

WH024

Fig
WT
4
Tread
wear
indicator

CHANGING
TIRE

To

change
tire
with
wheel

using
a

jack
in
the
safe
manner
observe
the

following
procedures

1
To

remove

spare
tire
insert

jack

rod

to

guide
and
then
turn
it
counter

clockwise
When

installing
lighten
a

little

strong
after

lifting
up
and
lock

Fig
WT
5
Removing
spare
tire

2
It
is

necessary
to
remove
wheel

cap
and
temporarily
to
loosen

wheel

nuts
before
vehicle
is

jacked
up

3
To

jack
up
front

place

jack
under

side

frame
about
S20

mOl
20
5
in
at

rear
of
front
axle

center
after

apply

ing
parking
brake
and

blocking
rear

wheels

g
1

WT012

Fig
WT
6

Jacking
up
front
side

KNOB
ILLUMINATION

LAMP

The
illumination

lamp
is

located
on

the
illumination
control
rheostat

This

lamp
illuminates
the
knob
of

the

wiper
switch
and

lighting
switch

with

fiberscopes

The

fiberscopes
between
the
knobs

and

cap
of
the
illumination

lamp
carry

the

light
through
their
tubes
with
the

inner

reflective
walJ

CID

1
Bulb
socket

2

Screw

3

Lamp
body

8E705B

Fig
BE
17
Knob
illumination

lamp

BULB
REPLACEMENT

I
Reach

up
from
under
the
instru

ment

panel
and

pull
out
socket
with

bulb
from

lamp
body

2

Pick

up
bulb
and

install
a

new

one

3

Installation
is
in
the

reverse
se

quence
of

removal

LAMP
BODY
REPLACEMENT

1
Remove
illumination

control

rheostat
Refer
to
section

of
illumina

ti

on
control
rheostat
for
removal

2
Disconnect
lead
wires
for

illumination

lamp
at
connector

3
Remove
screw

retaining
lamp

body
to
instrument

panel

Lamp
body

can
then
be

taken
out

easily

4

Installation
is
in
the
reverse
se

quence
of
removal

TURN
SIGNAL
AND

DIMMER
SWITCH

REMOVAL
AND

INSTALLATION

I

Remove

steering
wheel

Refer
to
the
related
section

Steering
Body
Electrical

System

2
Unhook

wiring
assembly
from

clip
that
retains

wiring
assembly
to

lower
instrument

panel

3
Disconnect

multiple
connector

and
lead
wire

from
instrument
harness

wiring

4
Remove

shell
covers

Upper
and

Lower

5
Loosen
two
screws

attaching

switch

assembly
to

steering
column

jacket
and

remove
switch

assembly

6
Position
switch

assembly
to
steer

ing
column

jacket
Make
sure
that
a

location
tab
or
screw
fits
in

with

hole
of

steering
column

jacket
7

Tighten
two

attaching
screws

8

Install
shell
covers

9

Connect

multiple
connector
and

lead
wire

to
instrument

harness

wiring

10

Clip
wiring
assembly
at
lower

instrument

panel

II

Install

steering
wheel

INSPECTION

Test

continuity
through
lighting

switch

by
using
test

lamp
or
ohm

meter

3

terminal

4
terminal

7
terminal

Dimmer

R

STOP
LAMP
SWITCH

REMOVAL
AND

INSTALLATION

Stop
lamp
switch
is
mounted
at
the

bottom
of

pedal
and

steering
post

bracket

I
Disconnect
battery
ground
cable

2
Disconnect
lead
wires

at
coonee

tors

3
Loosen
lock
nut
unscrew
switch

assembly
and
remove
switch

assembly

4
Install
switch

assembly
as
de

scribed
under
Brake
Pedal
in

Section

BR

INSPECTION

When

plunger
is

pressed
into
switch

assembly
when
brake

pedal
is
reo

8El0
I
Ll

vt
r

I

ER
4JN
l
L

PlOSITlON

RI

j
LASH
n
I

I

12
STOP

9
91

I
JFRe

I
I

II

L
I
III
11

I

I
II
161

I
61616

BE706B

Fig
BE
IS
Turn

signal
and
dimmer
switch

leased

stop
lamp
switch
contacts
are

open
On
the

contrary
contacts
are

closed
with

plunger
projected

DOOR
SWITCH

Door
switch
is
installed
on
both

L
H
and
R
H
front
door

pillars

REMOVAL
AND

INSTALLATION

I
Disconnect

battery

ground
cable

2
To

pull
switch

assembly
out

of

lower

pillar
withdraw
switch
and

wiring
assembly

3

Disconnect
lead
wire

at
cannee

tor

4

Installation
is
in

the
reverse
se

quence
of
removal

Body
Electrical

System

Circuit

diagram
of
combination
meter

system

BATTERY

r
G
0

J

J

Z2

lIa

I

LlJ

I
Z

J

Z

a
z

J
z
Z

i

g

o
a

I
LlJ

I
ll

B

S

M

D

LIGHT

i
i
RELAY

i2i

mm

S

FROM

J

e
AMP

l1

l1

J
J

00

LlJLlJ

z
z

B

COO
CUT

n

SOLENOID

i

OIL

f
PRESSURE

SWITCH

THERMAL

a

TRANSMITTER

I
FUSIBLE

r
LINK
IGNITION
SWITCH

0
1
lOA

I

g

KG
lOA

r

I

15A

t

15A

i

7
5a

z

u

a
a
I

04LlJ

l1

J
o

02

u
3
FUEL
TANK

J

VOLTAGE

REGULATOR
HAND

BRAKE

SWITCH

J
Jon

0

j

Z

a

l

I
I

I
l

ll
Z

ll
Z

LlJ
LlJ

J
a
J
a

I
I

I
I

1

1

Zza
a

00

a
a

LlJLlJ

ll
ll
a
a
HAZARD

FLASHER

UNIT

L
J

HAZAR

D

SWITCH

I
OFF

ONI

l
I

I

I
2

I

I
3

I

14

61
I
5
6

16

9
I

76

I

FLASHER

UNIT

CJ

TO
LIGHT
IOFF

RELAY

B
l

TERMINAL

I

I

I

LIGHT

SWITCH
21

X
X

BEB57
A

Fig
BE
22
Circuit

diagram
of
combination

meter

ayatt
m
TURN

SIGNAL

SWITCH

I
L

RI

lFLA
I

IR
R

I

IR
L

I

IF
R
u

I

IF
L

u

I

FROM
L1GHT

RELAY
DIMMER

SWITCH

BE

15

m
J
c
@
@
r

1
I
I

I
II

U
j
J

r
U

I
IT

L
U
L
L

@

Qj
flll
I

1

I
I

1

lL

to
t
l

Q
1
To
room
Jamp
cable

2
To
light
switch

3
To
fuse

4
To
tachometer
or
clock

5
To
hazard
flasher
unit

6
To
stop
lamp
switch

7
To
ignition
switch

8
To
hazard
switch

9
To
tU
and
dimmer
switch

10
To
check
connector

11
To
AMP
M
T
only

11
To
combination
instrument

Non
California
mode15
except
for
Canada

13
To
combination
meter

14
To
flasher
unit

IS
To
kickdown
switch
AfT
only

16
To
hand
brake
switch

17
To
heater
motor

18
To
illumination
control
rheostat
19
To
wiper
switch
light
switch
illumination

lamp

20
To
wiper
switch

21
To
cigar
lighter

22
To
heater
control
illumination
lamp

23
To
radio

24
To
heater
control

25
To
belt
and
E
G
R
warning
lamp

Non
California
models
or
floor
te
peratuJe

California
models

26
To
heater
control
illumination
lamp

27
To
buzzer

28
To
belt
warning
timer
U
S
A
Olodels

29
To
indicator
lamp
AfT
only

30
To
cooler
harness

31
To
wiptr
motor

32
To
door
switch
R
H

33
To
engine
compartment
harness

34
To
floor
harness

E
m

S
@
o
J
o

Q
m
CD
n

Ql
en
I
i
3