1973 DATSUN B110 brake fluid

CHASSIS

Ii

t

L

1

J

rJ
I

e

i
L
rubber

parts
und
alcohol

long
than
30
seconds

After
the

parts
are
cleaned

dry
them
with
com

pressed
air

Check
the

cylinder
and

piston
for

damage
and

uneven
wear
on
the

sliding
surface
and
for

other
defective

conditions

Replace
as

required

2

Replace
if
the

cylinder
and

piston
clearance
is

more

than
0
15

mm
0

006
in

3
In

principle
replace
the

piston
cup
packing
and

valves

with
new
ones
whenever

the
master

cylinder
is

disassembled
Be

sure
to

replace
if

damaged
worn

weakened

or

expanded

4
Check

the
return

springs
for
wear

damage
and
other

defective
conditions
and

replace
as

required

5

Replace
others
if

deformed

damaged
or
defective

Reassembly

Assemble
the
master

cylinder
in

reverse

sequence
of

SINGLE
MASTER
CYLINDER

s
m

e
disassembly
noting
the

following
matters

Apply
brake

fluid
to
the

component
parts
such
as

cylinder
bore

piston
etc
and

carry
out

the

operations

carefully
so
that

the

component
parts
are
not

damaged
or

no
dust
and
other

foreign
matters
enter
the

cylinder
and

brake
fluid
reselVoir

Moreover
for
rubber

parts
such
as

piston
cup
etc

apply
rubber

grease
slightly

Tightening
torque

Valve

cap

2
5

to
3
5

kg
m

I8
to
25
3

ft
Ib

Bleeder
screw

0
5

kg
m
3
6
ft
lb

Stopper
bolt

0
5
to
0
3

kg
m
l
I
to
2

2ft
lb

Reinstallation

Reinstall
the

master

cylinder
in

reverse

sequence
of

removal
After
air

bleeding
make

sure
that

no
brake
fluid

leaks
from
the
circuit
For
the

pedal
height
adjustment

refer
to
lhe

paragraph
pedal
adjustment

r
11L

y

Fig
BR
5
Cross

sectional
view

of
single
master

cylinder

BR
4

Tightening
torque

3

way
connector
1
5

to
1
8

kg
m

10
8
to
13
0
ft
lh

1
5
to
1
8

kg
m

10

8
to
13

0
ft

lh

1
5
to
1
8

kg
m

10

8
to
13

0
ft

lb

0

7
to
0
9

kg
m

5
1
to
6
5

ft
1b
Master

cylinder

Brake
hose

Air
bleeder

5

Fill
the

master

cylinder
brake

fluid
reservoir
with

brake
fluid
and

perform
air

bleeding
complele1y

Note
a
Do
not
use

brake
fluid
other
than

specified

b
The

specified
brake
fluid
is
used
for

both

single

and
tandem

type
master

cylinders

6

Upon

completion
of
air

bleeding
make

sure
that
the

brake

operates
correctly
and
check
the
brake
tube
and

hose
connectors
for
fluid

leaking
Fully
depress
the

brake

pedal
continue
to

depress
the
brake

pedal
for
several

seconds
and
make
sure
that
no
brake

fluid
leaks
from

any

part
of
the
brake
line

Replace
defective

part
if

required

Brake
line

pressure
differential

warning

light
switch

A

warning
light
is

located
on
the
instrument

panel
to

warn
the
driver
when

a

pressure
difference
of
13

to
17

kg
cm2
185
to

2421bJsq
in
exists
between
the

front
and

rear
b
rake

systems

A

hydraulically
actuated

warning
light
switch

is
located

in

the

engine
compartment
Both
front
and
rear
brake

systems
are
connected
to
this
switch
assembly

When

a

pressure
difference
of
13

to
17

kgJcm2
185
to

242

lbJsq
in
occurs
between
the
front
and
rear

brake

systems
the
valves

will
shuttle
toward
the
side
with
the

low

pressure
The
valve
contacts
with
the
switch
terminal
BRAKE

the

ground
circuit

for
the

warning
light
is

completed
and

thus
the

warning
light
lights

In
this

case
correct
the

hydraulic
brake

problem
and

bleed
the
brakes

Check
the

warning
light
switch

assembly
for
a

proper

operation
Check
the
switch

assembly
for
fluid

leakage

Note
Do

not

attempt
to

repair
switch
for

any
reason

replace
switch

assembly
completely

1
To
front
brake

L
H

2

From
master

cylinder
F

3
From
master

cylinder
R
4
To
rear
brake
L
B
R
M

5
To
front
brake
R
H

Fig
BR
12

Warning
light
switch

r

I

@

I
I
3

I
Valve

assembly

4

Piston
load

spring
Wire
terminal

Brake
tube

Fig
BR
13
Sectional

view

of

warning
light
switch

BR
7

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

CHASSIS

2

Upon

completion
of

the

adjustment
release
the
hand

brake

lever
and
make
sure
that
the
rear

wheels
are

not

braked

Normal
stroke

78
5

mm
3

091
in
6
notches

Limited
stroke

136
0

mm
5
35
in
10
notches

The
term
Stroke
means

height
from
the

standard

position
220

mm
8
7
in

above
the
hand

brake
lever

fulcrum

Note

Readjust
hand
brake
stroke
when
it
reaches
the

limited
stroke
136
mm
5
35
inl
10
notches

Bleeding
hydraulic

system

Bleeding
the

hydraulic
brake

system
deserves

much

attention
as
it
is

an
essential

factor
for

regular
service

brake

operation

As
a
matter
of

fact

during
the

brake
service
air
is

likely
to

creep
into
the
circuit
with

the
result
that

the

fluid
action
is

altered
and
the
brake

pedal
becomes

spongy

at
the
travel
end

Bleeding
should
be
carried
out
at
first
with

the
masler

cylinder
then
from
the

longest
line
from
the

master

cylinder
and
then
finish

up
with
the
shortest

Note

Always
clear

away
any
dirt
around
master

cylinder

reservoir

cover
before

removing
cover
for

any

reason
Never

depress

pedal
while

brake
drums
are

removed
unless
bleeder

valve
is

open

Top
up
the
reservoir

master

cylinder
with
fluid

of
the

recommended

type

2

Thoroughly
wipe
the
bleeder

screw
and
from

any

mud
or

dust

present
so
that
the

outlet
hole
is

free
from

foreign
matter

3

Attach
a

vinyl
hose

to
the
wheel

cylinder
bleeder

screw

Dip
the
end
of
the

vinyl
hose
in
a

jar
con

taining

some
brake
fluid

BR

22
I
I

I
Air
bleeder

I
2

I
Vinyl
hose

Fig
BR
54

Connecting
vinyl
hose
to
air
bleeder
rear

4

Depress
the

brake

pedal
two
to

three
times
and

keep

the

pedal
fully

depressed

5

With
the
brake

pedal
fully
depressed
loosen
the

bleeder

screw
exhaust
air

and

retighten
the

bleeder
screw

quickly

6
Return
the
brake

pedal
slowly

7

Repeat
the

operations
4

through
6

above
Air

will

no

longer
come
out

from
the
bleeder

screw
but

brake

fluid
comes
out
When
air

still
exists
in
brake
fluid
it

appears
white
due

to
air

bubble

8

Conduct
air

bleeding
on
other
wheel

cylinders
in

the

same
manner

Note

a
Check
the
reservoir
for
fluid
level

during
bleed

ing
operation

b
Fluid

withdrawn
in
the

bleeding
operation

should

not
be
used

again
for

refilling

c
When
the

master

cylinder
is
disassembled

or

replaced
conduct
air

bleeding
on
the
wheel

cyl

inder
which

is
located
most
near
the
master

cylinder

d

Ordinarily
air

bleeding
is

performed
in
the

following
sequence

Rear

left
Rear

right
Front
left

Front

right

e
Do

not
retum
the
brake

pedal
before

re

tightening
the
bleeder

screw

Lining
material

Front

disc
brake

Pad
width
x
thickness
x

length

Total

braking
area

Rear
brake

Lining
width
x
thickness
x

length

Total

braking
area

Tightening
torque

Brake

pedal
fulcrum

pin

Master

cylinder
installation
bolt

Brake
tube
installation

flare
nut

Rear
brake
hose

and
connector

installation
nut

Front
wheel

cylinder
installation
bolt

Brake

warning
switch
installation

bolt

Front

brake
disc
installation

bolt

Caliper
assembly
installation
bolt

Rear
brake

adjuster
installation
bolt

Hand

brake
cable

hanger
strap

installation
bolt

Hand
brake
lever
installation
bolt

Rotor
and
hub

installation
bolt
CHASSIS

mm
in

cm2

sq
in

mm
in

cm2

sq
in

kg
m

ft
1b

kg
m

ft
lb

kg
m

ft
lb

kg
m

ft
lb

kg
m

ft
lb

kg
m
ft
lb

kg
m

ft
lb

kg
m

ft
lb

kg
m

ft
lb

kg
m

ft
lb

kg
m

ft
lb

kg
m

ft
Ib
B40
Akebuno

make

42
5
x
10
3
x
53
I
1
673

x
0
406
x
2
091

90
3
14
0

35

x
4
8
x
195
1
378

x
0

1890
x
7

68

273

42
3

2
0
to
3
0

11
6
to
217

2
1
to
2
9
15
2
to

21
0

1
5
to

1
8

l
0
8
to
13
0

1
5

to
1
8
10
8
to
13
0

a
0
5

to
0
7
3

6
to
5
I

b
1
6
to
2
2

I
1
6
to
15
9

0
32
to
0
44

2
31
to
3
18

2
7
to
3
7

19
5
to

26
8

4
6
to
6
1
33
3
to
44

1

1
6
to
2
2
11
6
to
15

9

0
32

to
0
44

2
31
to
3
18

1
0

to
I
4
7

23
to

10
1

44

to
59
31
8
to
42
7

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Condition

Spongy
pedal
Air
in
brake
lines
Probable

cause

Swollen
hose

due
to
deterioration
or

use
of

poor
quality
brake

fluid

BR
24
Corrective
action

Bleed

thoroughly

Replace
hose

and
bleed
the

system

Pedal

yields
under

slight

pressure

Excessive

pedal

travel

All

brakes

drag

One
brake

drags

Unbalanced
brakes
BRAKE

Use
of
a
brake
fluid
with

a

boiling
point

which
is
too
low

Reservoir

filler

cap
ven
t
hole

clogged
This

promotes
a
vacuum
in
master

cylinder
that

sucks
in
air

through
rear
seal

Deteriorated
check
valve

External

leaks

Master

cylinder
leaks

through
primary
cap

System
has

not
been
bled

Improperly
adjusted
clearance

Fluid
level
in

master

cylinder
is
too
low

Thermal

expansion
of
drums
due
to

over

heating

Insufficient
shoe
tlrdrum

clearance

Weak
shoe

return

springs

Brake
shoe

return
no
free

travel

Seized
master

cylinder
piston

Loose
or

damaged
wheel

bearings

Weak
broken
or

unhooked
brake

shoe

return

springs

Insufficient
clearance
between
brake
shoe

and
drum

Grease
or
oil
on

linings

Seized

piston
in
wheel

cylinder

Tires

improperly
inflated

Loose
wheel

bearing

BR
25
Change
with
the

specified
brake

fluid
and

bleed

system

Clean
reservoir
filler

cap
and
bleed
the

system

Fit
a

new
check

valve
and
bleed
the

system

Check
master

cylinder
piping
and

wheel

cylinder
for
leaks
and
make

necessary
re

pairs

Overhaul
master

cylinder

Bleed

the

system

Adjust
shoe

to
drum

clearance

Full

up
with

specified
brake

fluid

Bleed
the

system
if

required

Allow
drums

to
cool
off
Check
brake

shoe

linings
and
drums

Replace
damaged

parts

Adjust
clearance

Replace
the

springs

Adjust
pedal
height

Service
the

master

cylinder
replace
the

piston
and
bleed

the

system

Adjust
or

replace
wheel

bearings

Replace
spring

Adjust
brakes

Clean
brake
mechanism

replace
lining
and

correct
cause
of

grease
or

oil

getting
on

lining

Service
the
wheel

cylinder
and

bleed
the

system

Inflate
tires

to
correct

pressure

Adjust
wheel

bearing