Front Disc Brake Friction Pads; Front Disc Brake Removal/Dismantling/Assembly/Installation - Datsun 510 series Workshop Manual

brake shoe is in
contact
with the drum The
adjuster
must
be
turned from the
rear
of the
backplate
and the drum turned by
hand
When the shoe
contacts
the drum
turn
the adjuster in
the
opposite
direction until the shoe is
just
clear and the drum
can be rotated freely by hand
Depress the brake pedal
and make
sure
that the brakes
operate correctly
The
adjusters
must be released slightly
if the
brake shoe binds
FRONT DISC BRAKE Friction
pads Fig
L 14
The disc brakes are
self
adjusting
but the friction pads
should be checked for
wear every
5 000 km 3 000 miles and
replaced
if the thickness of the friction
lining on any pad
is less
than 1 0mm 0 004 in In effect this
means
that renewal is
necessary
when the total thickness of
pad and lining
is less than
8 4 mm 0 24 in
To
replace
the friction
pads proceed as
follows
Siphon
out
some
of the fluid in the
master
cylinder
reservoir Jack up
the front of the vehicle and
remove
the road wheel
Remove the anti rattle clip from the calliper plate Fig L lS
Unhook the hanger spring and withdraw the brake pads
and shims Fig L 17
It should be noted that the friction
pads must
be
replaced
as a
set
and renewed
at
both sides of the vehicle otherwise the
braking
action will be
uneven
Oean the calliper and pad
at
their installation positions
Press the pistons into the calliper bores
so
that the
new
friction
Pads
can
be installed The pistons can
be installed by applying
light
pressure
as
shown
in
Fig
L
16 but
care
must
be taken
to
avoid
pushing
them too
far
or
the
groove
of the piston will
damage
the seal
If the
pistons are
pushed down excessively it will be
necessary to
dismantle the calliper as described under the
appropriate heading
Assemble the anti
squeal
shims to
the friction
pads
with
the
arrow
mark
on
the shims
pointing
in the direction of
forward disc rotation
Refit the pads and retaining pins and assemble the coil
spring
to the
retaining pin
furthest
away
from the air bleed
screw
After installing the
new
pads and shims depress the brake
pedal several times
to
reposition the
pistons in the calliper
O1eck the fluid level in the
master
cylinder reservoir and refill
to
the
correct
level
FRONT DISC BRAKE Removal and
Dismantling
1
Jack up the front of the vehicle
remove
the road wheel
and take
out
the friction pads
2
Disconnect the brake hose from the brake tube and
plug
the opened end to prevent
the loss of fluid
3 Remove the bolts
securing
the brake
calliper
to the
knuckle
flange
and
remove
the calliper assembly Fig
L IS
4 Remove the hub
nut
and withdraw the hub and disc
To dismantle the
calliper
remove
the anti rattle clip and
withdraw the brake pads
Remove the tension springs and pull
the
cylinder
out
of the calliper Blow out the
piston
with com
pressed
air
applied
at
the brake hose connection
Oean the
components
in brake fluid and examine them
for
signs
of
wear or
damage
The cylinder walls
can
be
carefully polished
with fine
emery cloth if they
are
rusted
or
contaminated If the
parts
are
excessively corroded they
should be renewed
Replace
the
pistons
if
they are
unevenly
worn
damaged
or
rusted The
sliding
surface of the
piston
is
plated
and
no
attempt
should be made to
use
emery
cloth
or
similar abrasives
for cleaning
purposes
Check the thickness of the friction
pads
as
previously
described and
replace
them if
necessary
Renew the
piston
seals
and the dust
covers
O1eck the brake disc for scoring and
out
of round The
standard disc thickness
is
10 Omm 0 0394 in and
must not
be reground below 8 4mm 0 3307 in
Check the disc
run
out
with
a
dial
gauge
as
shown in Fig
L 19 Position the
gauge near
the
outer
diameter and check that
the
run
out
does not exceed 0 06mm
0 0024 in
FRONT BRAKE DISC
Assembly
and Installation
Rinse the cylinder
bore with brake fluid and fit the piston
seal into the cylinder
groove
Fig L 20 Fit the
wiper seal and
lightly
grease
the bore of the cylinder Clean the brake disc
and fit it
to
the hub Install the hub
to
the knuckle
spindle
Carefully insert the piston into the cylinder
until the face
of the piston
is almost flush with the
wiper
seal retainer The
relieved
part
of the piston should face the piston pin
Fit the
cylinder
to
the
calliper plate
and
secure
in
position
with the
two
torsion
springs
Assemble the hold down
pin
the spring washer and the
nut to
the support
bracket Secure
the
nut
with a
cotter
pin
Assemble the
calliper
to the
mounting bracket using the
pivot pin
washer
spring
washer and
nut Tighten
the nut
and
secure
with
a
cotter
pin
Hook the hold down bracket
to
the
top
of the mounting
bracket and
turn
the calliper plate to make
sure
that it
can
slide smoothly Fit the
calliper assembly
to
the
knuckle
flange
Fit
a
shim
to
the inner
pad
and insert the
pad
Draw the
calliper
towards the chassis and insert the lower cuts
on
the
pad
into the mounting bracket and push the pad
in until it
contacts
the piston
Move the calliper
away
from the chassis and insert
the upper
cuts
Centre the indentation of the
outer
pad in the
calliper plate Fit the anti rattle
clip
Fig L 14
103