Datsun 1200 1971 Workshop Repair Manual page 75

Brakes
Thoroughly
Wipe
the bleeder
screw
and from
any
mud
or
dust
present
so
that the outlet
hole
IS
free from
foreign matter
Attach
a
VInyl
hose
to
the wheel
cyhnder
bleeder
screw
Dip
the end of the
VInyl
hose
In
a Jar
contaInIng
some
brake flUId
Depress
the brake
pedal
two to
three
times
and
keep
the
pedal fully depressed
With the brake
pedal fully depressed
loosen
the bleeder
screw
exhaust
air
and
rettghten
the bleeder
screw
qUIckly
Return the brake
pedal slowly
Repeat the
operatIons
above
Air WIll
no
longer
come
out
from the bleeder
screw
but
brake flUId
comes
out
When
atr
stIll
eXists
In
brake flUId
It appears
whIte due
to
aIr
bub
ble
Conduct
aIr
bleedIng
on
other wheel
cyhnders
In
the
same manner
Note
a
Check the reservoir for fluid level
during bleeding
operation
b FlUid withdrawn in the
operation
should
not
be used
refilling
bleeding
again
for
c
When the master cylinder
is dIsassem
bled
or
replaced
conduct air
bleeding
on
the wheel
cylinder
which is located
most
near
the
master cyhnder
d
Ordinarily
air
bleeding
is
performed
in
the
following
sequence
Rear left Rear
right
Front left Front
right
e
Do
not return
the brake
pedal
before
retightening
the bleeder
screw
TROUBLE SHOOTING
Condition Probable
cause
Corretttve
dellon
Spongy pedal
Au
In
brake lines Bleed
Ihoroughly
Swollen hose due
to
detenoratlOn
or use
of
Replace
ho e
md bleed the
system
poor
qualIty
brake flUid
Use of a brake
flu d wIth
a
bOilIng
pomt Change wIth the spectlied brake flUId dnd
which
15
too low
bleed
system
ReservOir
filler
cap
vent
hole
clogged
Tins Clean
reserVOIr
filler
cap
and bleed the
promotes
a
Vdcuum In
master cylinder
that
system
suckS
In air
through
rear
seal
Pedal Yields
under Detenorated check valve Fit
a new
check
valve and bleed the
system
shght
pressure
ExterIlalleaks
Check
master cyhnder
plpmg and wheel
cylInder
for leaks
and
make necessary
re
pairs
Master
cyhnder
leaks through
pnmary cap
Overhaul
master cyhnder
80