MG MGB User Manual

M
THE
BRAKING
SYSTEM
GENERAL
DESCRIPTION
The
Lockheed hydraulic brake
system
comprises
a
master
cylinder and ■uid
supply
reservoir,
automatically
adjusted
disc brake assemblies
at
the front of
the vehicle,
and
manually adjusted drum-type
brakes
at
the
rear.
The
master
cylinder and ■uid
supply
reservoir
assembly
is
mounted
on
the
engine
side
of
the bulkhead
above the
brake
pedal.
The front
brake
units
are
of
the
rotating
disc and
rigidly
mounted calliper
type,
each calliper
carrying
two
friction
pad assemblies
between which the
disc
revolves. The
rear
brake
units
are
of
the
internal-expanding shoe
and drum
type,
each
unit
being
operated
by
a
single wheel
cylinder
which
is
actuated
hydraulically
by the foot
pedal
and
mechanically
by the hand brake.
Section M.1
MAINTENANCE
Periodically
examine
the
quantity
of
brake ■uid
in
the
master
cylinder. The ■uid level should
never
be higher
than
1A
in
(6.35
mm.)
below the bottom
of the filler
neck, and
the cylinder
must
never
be less than
half-full.
A considerable
drop
in
the level of
the
■uid
in
the
reservoir
is
an
indication
of
a
leak
in
the
system
which should
at
once
be
traced and
rectified.
The
grease
nipple
on
the hand brake
cable should
be
charged
with
grease.
Brake adjustment
FRONT
Wear
on
the front
pads
is automatically
compensated
during
braking,
and
manual
adjustment
therefore
is
not
provided.
In
order
to
maintain
peak braking ef■ciency
and
to
obtain the
maximum
life from
the friction
pads they
should
be examined
at
the
recommended periods, and if
the
wear
on one
pad
is
greater
than that
on
the other
their
operating positions
must
be changed
over.
Fig.
MI
The
square
head
of the
adjuster spindle
REAR
As
the
brake-shoe
linings
wear,
the
movement
of
the
brake
pedal
will
increase,
indicating
that adjustment
is
necessary.
Block the
front wheels
and
jack
up
each
rear
wheel
in
turn.
Fully
release the
hand brake.
Turn
the
expander
in
a
clockwise
direction
until
the wheel
is
locked,
then
turn
back
one
notch only.
The wheel should
be free
to rotate
without the shoe
rubbing.
Adjust the
other
rear
brake
in
a
similar
way.
Adjustment of
the brake-shoes
automatically
adjusts the hand
brake
mechanism.
Preventive
maintenance
To safeguard
against
the possible effects
of
wear,
or
deterioration,
it is
recommended
that:
1.
Disc brake
pads, drum
brake linings, hoses,
and
pipes
should
be
examined
at
intervals
no
greater
than
those
laid
down
in
the
Passport
to
Service.
2. Brake ■uid
should be
changed
completely
every
18
months
or
24,000 miles
(40000
km.)
whichever
is
the
sooner.
3. All ■uid
seals
in
the hydraulic
system
and
all ■exible
hoses
should
be
examined and
renewed
if
necessary
every
3
years
or
40,000
miles
(65000 km.)
whichever
is
the
sooner.
At the
same
time
the
working surface
of
the
pistons
and of the
bores of
the
master
cylinder,
wheel
cylinders,
and other slave
cylinders
should be
examined
and
new
parts
■tted where
necessary.
Care
must
be
taken always
to
observe the following
points:
a.
At all
times
use
the
recommended brake ■uid.
b.
Never
leave ■uid
in
unsealed
containers. It
absorbs
moisture quickly
and this
can
be
dangerous.
c.
Fluid
drained from
the
system
or
used for
bleeding
is
best
discarded.
d.
The
necessity
for
absolute
cleanliness
throughout
cannot
be
over-emphasized.
Section
M.2
BRAKE PEDAL
The
brake and
clutch
pedals
are
mounted
at
a common
fulcrum
point
inside
the
master
cylinder
cover.
Removing
Remove the
screws
securing
the brake and clutch
master
cylinder
cover
and
take
off
the
cover.
Extract
the split
pin
and withdraw the
clevis
pin
to
release
the
master
cylinder push-rod from
the
brake pedal. Detach
the
brake pedal
return
spring
and
remove
the
nut
and
spring
washer from the
pedal fulcrum
bolt .The fulcrum
bolt
may
now
be withdrawn
together
with the brake
pedal and
internal distance
sleeve.
The clutch
pedal will
remain in
position
held
by
its
return
spring
and
master
cylinder
push-rod.
Reverse the above
procedure
to
replace
the brake
pedal,
noting
that
the head of
the fulcrum
bolt
is
at
the clutch
pedal side of
the
assembly.
MGB.
Issue6. 80619

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English