Brake Warning Light Switch; Front Drum Brake Removal/Inspection/Overhaul/Assembly/Installation/Adjustment; Rear Drum Brake Adjustment - Datsun 510 series Workshop Manual

BRAKE WARNING UGHT SWITCH
A hydraulically operated warning light switch is located
in the
engine compartment Fig
LA
The front and
rear
brake systems of the dual circuit
are
connected
to
the switch which
provides a
warning via the
warning light
on
the instrument panel when a
pressure difference
of 13 17 kg
sq
cm
185 242Ib sq in
occurs
between the
front and
rear
brake systems The switch cannot be repaired
and must be renewed if
faulty
FRONT DRUM BRAKE Removal
1
Jack up the front of the vehicle and
support
it
on
stands
2 Remove the brake drum and the hub cap and hub assembly
3 Disconnect the brake
pipe
at
the bracket
on
the front
suspension
strut
as
previously
described in the section
FRONT SUSPENSION
4 Unhook the
two return
springs shown in Fig L5 and
remove
the brake shoes
5 Disconnect the
bridge pipe
3 in
Fig
L 6 and
remove
the
two
wheel
cylinders
6 Take
out
the installation bolts and withdraw the brake
backplate from the spindle
FRONT DRUM BRAKE
Inspection
and Overhaul
Examine the brake drums for
scoring
and
out
of round
The maximum permissible
inner diameter of the drums
must
not
exceed 228 6mm 9 00 in and
out
of round should be
below 0 02mm 0 0008in
The brake shoe linings
must
re renewed when
worn
down
to
a
thickness of 1 5mm
0 06 in
or
below Renew the
linings
if
they
are
contaminated in
any way or
incorrectly
seated The complete set of linings must be replaced if
any
single lining
is
unsatisfactory
O1eck the shoe
return
springs and if they have become
weakened
replace
them
Withdraw the
pistons
and
springs
from the wheel
cylinders
and inspect the bore of the cylinders for signs
of
wear
corrosion or damage
Renew the
cylinder
and the
piston
if the clearance between
the two
exceeds O 15mm 0 006 in Renew the rubber boots
and cups
FRONT DRUM BRAKE
Assembly
and Installation
Assembly
and installation is
a
reversal of the removal and
dismantling procedure noting the fOllowing points
Apply
a
thin layer of
special
grease
to
the
piston
cup and
other rubber
parts
when assembling the wheel cylinder The
internal
components
of the
cylinder
should be dipped
in brake
fluid and assembled whilst still
wet
Install the wheel
cylinders
on
the brake
backplate
and
smear
the cylinder backplate and cylinder
lever fulcrum with
grease
Fig L8
Tighten
the
backplate mounting bolts
to
a
torque reading
of 2 7 3 7
kgm 19
5 26
71b ft
Adjust the brake shoes and bleed the hydraulic system
as
described under the
appropriate headings
REAR DRUM BRAKE REMOVAL Fig L IO
Jack up the vehicle
at
the
rear
and support it on stands
Remove the road wheel
2
Release the handbrake
remove
the clevis
pin
3 from the
rear
wheel cylinder lever 4
see
Fig
L 9 Disconnect the
handbrake cable 2 and remove the
return
spring I
3
Remove the brake drum Remove the shoe retainers the
return
springs
and brake shoes
Fig
L II
4
Disconnect the fluid line from the wheel
cylinders
and
plug
the
opened end
to
prevent
to
loss of fluid
5 Remove the dust
cover
adjusting shims and plates then
remove
the wheel
cylinder
from the
backplate
6 The brake backplate and axle shaft assembly
can
be with
drawn if necessary by taking
out
the four flange bolts
and removing the assembly
as
described in the section
REAR AXLE AND REAR SUSPENSION
REAR DRUM BRAKE
Inspection
and Overhaul
The inspection
and overhaul
procedures fpr
the
rear
drum
brakes
are
similar
to
those previously
described for the front
drum brakes
Tighten the brake backplate mounting bolts
to
a torque
reading
of 3 9 5 3 kgm 28 38Ib ft
FRONT DRUM BRAKE
Adjusting
Jack up the vehicle and pump the brake pedal several times
With the brake drum installed turn
one
of the adjusting
cams
clockwise until the brake shoe is in
contact
with the drum
This
operation
is carried
out
from the
rear
of the backplate
When the brake shoe
contacts
the drum
turn
the
cam
in
the opposite direction until the shoe is just
clear and the brake
drum
can
be rotated
freely by
hand
Repeat
the
operation
on
the other
adjusting cam
and then
depress the brake pedal
to
make
sure
that the brakes
are
working
correctly
The
adjusters
must
be released slightly
if the brake
drum binds when turned
by
hand
Fig
L 12 shows the adjusting
cams
REAR DRUM BRAKE
Adjusting
Jack up the vehicle
at
the
rear
and pump the brake pedal
several times Turn the brake shoe adjuster Fig L 13 until the
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