1973 DATSUN B110 brake

CHASSIS

FRONT
DRUM
BRAKE

14
I

l

Fig
BR
14
Front
drum
brake

components

Removal
and

disassembly

Jack

up
the
vehicle

support
with
a
stand

and

remove
the
wheel
cover
and
tire

2
Remove

the
brake
drum
and
remove
the
hub

cap

and
hub

assembly
from
the

spindle

3
Disconnect
the

brake
tube

at
the
bracket
unit

of
the

strut

assembly
For
the

details
refer
to
Section
FA

R

W
i

1
t

V
t

1
1

d
j

2
rl

s
J
J
i

Z
j

Fig
BR
15
Front

drum
brake
4
Unhook

the
return

spring
and
remove
the

brake
shoe

assembly

5

Disconnect
the

bridge
tube
from

lhe
fore
and
after

wheel

cylinders

I
I
After
wheel

cylinder

Bridge
tube

I
3

I
Fore
wheel

cylinder

Fig
BR
16

Fore
and

after
wheel

cylinders

and

bridge
tube

6
Remove
the
installation
bolts
and
remove
the
fore

and
after
wheel

cylinders

BR
B

7

Remove
the

brake
disc

installation
bolt
and
remove

the
brake
disc
from
the

spindle

8
Disassemble

the
wheel

cylinders

Inspection

l
Drums

If

they
show

score
excessive
out
of

round

and
so
forth

reconditioning
by
machining
is

required

Brake
drum
inner

diameter

203
2

mm
8
00

in

Drum

inside
out
of
roundness

Below
0

02
mm
0
0008
in

Max

allowable
drum

inner
diameter

204
5

mm
8
051
in

2

Linings
If
brake
shoe

linings
are

incomp1etedly

seated

soiled
or

greasy
or
deteriorated
due

to
excessive

heating
repair
or

replace
them

If
the

thickness
of
the

lining
is
less

than
1
5

mm
0
0591
in

replace
it

Note
a
If
oil
or

grease
is
found
on

linings
clean

thoroughly
with
carbon
tetrachloride
or

gasoline

b
After

installing
and

bonding
lining
grind
the

lining
face

to
a
diameter

equal
to
the
brake
drum

3

Check
the

adjusting
cams

for
their
smooth

operation

4
Return

springs
If

they
are

considerably
weak

replace
them

Return

spring
dimension

Wire
diameter

x
free

length
turns

3
2

x
118

mm
20
5

0
1260
x
4

65
in

20
5

Load
x

length

55

kg
I21
lb
x
127
1

mm
5

00
in

13
4
0
528

ilL
rnv

0
t
6

hl
03

118

4
65

FREE

LENGTH

UNIT
mm

in

Fig
BR
J
7
Return

spring
BRAKE

5

Check
the
brake
disc

for
distortion

6
Check

the
bore
of
the

wheel

cylinder
for
wear

sign

of
rust
and

damage

If
clearance
between

the

cylinder
and
the

piston

exceeds
0
15

mm
0
0059

in

replace
them

Fig
BR
J
8

Sectional
view

of
front
wheel

cylinder

7
When
the

wheel

cylinder
is

overhauled
it
is

recom

mended
that

cups
be

replaced
even
if

apparently
they
are

in

satisfactory
conditions

Cups
must
be

replaced
if

deformed
due
to

damage
crack
corrosion

smelling

andf
or

aging

Reassembly
and
reinstallation

The
rear

brake
is

reassembled
and
reinstalled
in
reverse

sequence
of

disassembly
and
removal
However
note
the

following
matters

When

assembling
the
wheel

cylinder
be

sure
to

apply

rubber

grease
to
the

piston

cup
and

other
rubber

parts

slightly

2
When

installing
the
wheel

cylinder
to
the
brake

disc

apply
brake

grease
to
the

cylinder
disc
and

adjusting

plate
sliding
surfaces
and
to
the
wheel

cylinder
lever

fulcrum

portion

sufficiently
so
that
the
wheel

cylinder

slides

smoothly

BR
9

CHASSIS

Fig
BR
19

Greasing
points
on
brake
disc

3

Tighten
the
brake
disc
installation
bolt

to
2
7
to
3
7

kg
m

19
5
to
26
7
ft
lb
4

Adjust
brake
shoe
clearance
and

perform
air

bleeding
on

the

hydraulic
system

FRONT
DISC
BRAKE

Floating
type
disc

brake
Model
ANNET

12
14A
is

used
for
some
territories
as
a

standard

Rigidity
of
the

caliper
is

high
brake

pedal
feeling
is

adequate
and
the

pad
dragging
is
minimized
The

pad
is

returned

by
elasticity
of
the

piston
seal
When
the

pad
is

worn
the

piston
operating
stroke

increases

slipping

occurs
on
the

piston
seal
surface
and
thus
clearance
is

adjusted
automatically

Moreover
in
order
to

prevent
brake

squealing
a
shim
is

inserted
behind
the

pad

2

I

Clip
6
Brake

pad
II

Cylinder
block

2

Spring
7
Air
bleeder
12
Piston
A

3
Clevis

pin
8

Retaining
ring
13
Bias

spring

4

Shim
9
Boot
14
Yoke

spring

5

Hanger

spring
10
Piston
B
15
Yoke

Fig
BR
20
Front
disc
brake

components

BR
lO

BRAKE

CYLINDER
SIDE

PISTON
SIDE

COMPR
ESSION

DECOMPRESSION

Movement

exceeding
the

elastic

displacement
is

released
with

slipping
on

the
seal
surface
Returns
in
elastic

displacement
of

the

seal

Fig
BR
21
Piston

seal
automatic

adjusting
operation

Brake

pad

Replacement

1
Jack

up
front
unit
of

the
vehicle
and
remove
lhe

front

wheeL

2
Remove

clip
from
the

retaining
pin
and

supporting

the
brake

pad
remove
the

retaining
pin
and
coil

spring

I

I
Brake

pad

2

Retaining
pin

I
31
Clip

Fig
BR
22

Removing
retaining
pin

3
Unhook

the

hanger
spring
and
withdraw
the
brake

pad
and
shim
with
a

pair
of

pliers

BR
ll
Fig
HR
2

Withdrawing
brake

pad
and
shim

Note
When
the
brake

pad
is
removed
do
not

depress
the

brake

pedal
or
otherwise
the

piston
will
come
out

Inspection

Clearance
between
the

brake

pad
and
rotor
is

adjusted

automatically
Check
the
brake

pad
for
wear

after
the

first
10
000
km
6
000

miles

driving
and

every
5
000

km
3
000

miles
thereafter

1

Clean
the
brake

pad
with
carbon
tetrachloride
or

gasoline

2
When
oil
and
or

grease
is

heavily
sticked
on
the

pad

or
when
deteriorated
or
deformed
due
to

overheating

replace
the

pad
with

a
new
one

3
When
thickness
of
the

friction
material

pad
is
less

than
1
6
mm
0
0630
in

replace

Replace
when
total

pad
thickness
is

less
than
6
1
mm

0
2402
in

Note
Replace

pads
as
a
set

Replacement
at

only
one

position

may
cause
uneven
brake
effect
It
is

recommended
that
rotation
of

pads
be
made

periodically

4
Check
the
rotor
Refer
to
Rotor

inspection

Reinstallation

1
Clean
the

calipers
and

piston
pad
installing
parts

Note
Do
not
use
mineral
oil
Be
careful
not
to

apply
oil

on
the
rotor

2

Depress
the

piston
into
the

cylinder
so
that
new

pad

can
be
installed

CHASSIS

Fig
BR
24

Depression
piston
A

and
B
into

cylinder

Nota
a
Nota
that
brake
fluid

may
overflow
from
the

reservoir
It
is
recommeooed
that

operation
be

carried
out

by

loosening
the
breather
to
release

brake
fluid

b
The

piston
can
be

easily
pushed
in

by
hand
But

if

pushed

excessively
the

groove
of

piston
goes

inside
of
seal
as
shown
in

Figure
BR
25
and
the

seal
will
be

damaged
When
the

piston
is

pushed

excessively
into
the

cylinder
remove
the
brake

assembly
disassemble
it

push
out
the

piston
to
the

arrow
direction
as
shown
in

Figure
BR
25
and

reassemble

r
w

i

@

I

I

I

I
i

I

I

I

1

I
1

1
Piston

ieat

1
2

I
Normal

position
I

Fig
BR
25
Piston

pushing
in

position

3

Install

pad
and
anti

squeal
shim
assemble

the

anti

squeal

spring
and

retaining

pin
and

secure
them

with

clip
ARROW

MARK

Fig
BR
26
Arrow
mark
on
shim

I

Install
the
shim

so
that
the
arrow

mark

points
the

rotor
forward

rotating
direction

2

Apply
the
coil

spring
to

the

retaining

pin
which
is

distanced

from
the
air

bleeder

4

When
the

pad
is

installed

depress
the
brake

pedal

several
times

so
as
to
settle
down
the

pad
in
the

position

Caliper

assembly

Removal

L

Remove
the
brake

pad
Refer
to
Pad
re

placement

2

Disconnect
the
brake

tube
from
the
wheel

cylinder

3

Remove

the
strut

assembly
and

knuckie
arm
instal

lation
bolt

so
as
to

ease
removal
of

the

caliper

assembly

installation
bolt

BR
12

BRAKE

Fig
BR
27

Removing
strut

assembly
and
knuckle
arm

installation
bolt

4
Remove
the

caliper
assembly
installation

bolt
and

separate
it

from
the

strut

assembly

Fig
BR
28

Removing
caliper
assembly
instaUation
bolt

Disassembly

I
Remove

mud
and
other
contaminations
from

the

caliper
assembly
before

disassembly

2
Drain

brake
fluid
from
the
wheel

cylinder

3

Loosen
the
air
bleeder
and

depress
tha

pistons
A

and
B
into
the

cylinder
Refer
to
Pad

replacement

4
Secure
the

yoke
in
a
vise
and

tap
the

yoke
head

with
a
hammer
The

cylinder
body
can
then

be

removed
from
the

yoke
When

removing
the

cylinder

body
be
careful
not

to
allow

the

piston
A

coming
out

from
the

cylinder

BR
13
i
c
J

l
l

7

I

0

I

I

i

I

f
1

1

J
t
1

Fig
BR
29

Tapping
yoke
head

5
Remove
the

bias

ring
from
the

piston
A

6

Remove
the

retaining
rings
and

boots

from
the

pistons
A
and
B

J

l

lj

7

fI

II
l

j
B

11
I
Retaining
ring

121
Boot

Fig
BR
30

Cylinder
body
and

piston

7

Depress
and

remove
the

piston
from
the

cylinder

8
Remove
the

pislon
seal

from
the

cylinder

Note
Remove
the

piston
seal

carefully
with

fingers
so

that
the

cylinder
wall
is
not

damaged

9
Remove
the

yoke
spring
and

yoke
bias

spring
from

the

yoke

Inspection
and

repair

Thoroughly
clean
all
disassembled

parIs
and
check

them

for
the

following
items

CHASSIS

Note
When

cleaning
rubber

parts
use
alcohol

or
brake

fluid
If
rubber

parts
are
cleaned
with
mineral
oil

they
will
be
deteriorated

1

Calipers

If
the

cylinder
wall

is

damaged
or
worn

replace
If
the

cylinder
wall
is
rusted
or

foreign
matters
are
accumu

lated
on

the

cylinder
wall

carefully
polish
with
fine

emery

paper
so
that

the

cylinder
wall
is
not

damaged

If
rusted
or

roughened
excessively

replace

2

Pad

See

paragraph

covering
replacement
of

pad

3
Piston

Replace
if

unevenly
worn

damaged
and
or

rusted

Note
The

piston

sliding
surface
is

plated
Thus

do
not

use

emery
paper
although
rusted
or

foreign

matters
are
Slicked
on
the

sliding
surface

4

Seals

Primarily
replace
both

piston
and
dust

seals
whenever

overhauling

Note
The

piston
seal
affects

not

only

leaking
but
also

piston
return
For

this
reason

replace
the

piston

seal

even
if

the

damage
is
minor

S
Rotor

Check
the
rotor
and
if
it

shows
score

excessively
out

of
round

and
so
forth

reconditioning
by

machining
is

required
If

any
abnormal
conditions
such
as

crack

distortion

and
excessive

deflection

replace
the

rotor

Standard
rotor
thickness

9
5
mm
0
3740
in

Limit
of

reconditionillg
rotor
in
thkkn

8
4

mm
0
3307
in

Deflection
of
the
rotor

Below
0
03

mm
0
0012

in
I

I

I

I

ri

U

h

J
r

Fig
BR
1

Measuring
deflection
of
disc

Reassembly

Apply
the
rubber

grease
to

cylinder
bore
and
install

the

piston
seal

2

Insert

the
bias

ring
to

piston
A

so
that
the

roundish

portion
of

bias

ring
comes
to
the

bottom
of

piston

1

ilY
f@

I
I

C

I
1

n
tL

c

ffi

1
1
fJ

u

IZ

@

I
I
Yoke

Chamfer

13
PistonA

I
4
Roundish

portion

Fig
BR
32

Installing
bias

ring
into

piston
A

Note
Be
careful
not

to
confuse
the

piston
A
with
B

BR
14

BRAKE

i
f

F

PISTON
A
PISTON
S

Fig
BR
33

Piston
A
and
B

3

Apply
rubber

grease
lightly
to
the

sliding
portion
of

piston
and
insert
the

piston
into
the

cylinder

Note
When

inserting
the

piston
be
careful
not

to
insert

too
far

4
1
nstaU
the
boot
and

retaining
ring

Fig
BR
34

Installing
boot

5

Install
so
that
the

yoke

groove
of
bias

ring
of

piston

A
coincides
with
the

yoke
groove
of

cylinder

6

Install
so
that
the

projected
portion
of

yoke
spring

faces

to
disc
as

shown
in

Figures
BR
35

and
36

BR
15
YOKE
SPRING

Fig
BR
35
Installation

of

yoke
spring
1

Fig
BR
36
Installation

of
yoke
spring
2

7
Install
the

bias

spring
to

yoke
so
that
the

bias

spring

comes
to
the
air
bleeder

side
of

cylinder

8

Apply
the
brake

grease
to
the

yoke
sliding
portion
of

cylinder

9
With
the

yoke
spring
inserted

to

cylinder
groove

lightly
correct

position
of
the
bias

spring
so
that
the

groove
of
bias

spring
conincides
with

yoke