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M
THE
BRAKING
SYSTEM
4072A
8
Fig. M.6
Tire
disc
brnk
e
roliper
components
I.
Caliper.
6. Sl•pport plate.
11
.
Piston seal.
1.
Friction pad
assembly.
12.
Retractor
bush.
1
6.
Retractor
stop
bush.
17.
Reuactor
pin..
2. Cyl;nder block.
8.
&eking pl><e.
13.
Mate.
9. Dust
seal.
14.
Cap.
3.
Cyl;ndcr
block.
18.
Bleed
screw.
19.
Bleed
screw
ball.
4.
Rril.lge
pipe.
5.
Keep
plate.
10.
Piston.
IS.
Spring
washer.
Engage
the
<'Ollar
of a new
dust
seal with the lip on
the
backing
plate on the
piston spigot,
and \\ith the
piston
suitably
supported
press
the backing
plate fully
home.
Insert the
retractor
bush
into
the
bo
re of
the
piston.
Lightly lubricate
the
piston
seal
with
brake
Ruid
(if
there
is
~ny
doubt
about
the
condition
of this component
it
should
be
renewed)
and fit it to the
piston face.
A ttach
and
secure
the
plate
with the
screws,
and
peen·lock the
screws.
Check
that
the
piston and
the
cylinder bore
arc
thoroughly clean
and
show
no
signs
of damage.
Locate
the
piston
assembly on
the
end
of
the
retractor
pin,
a nd
with
the
aid of a
hand press
<lowly
apply
an
even pressure
fl.f.6
to
the backing
plate
and
press the
assembly into
tbe
cylinder
bore.
Ensure
that the
piston
assembly
is in
correct
a lignment
in
relation to the cylinder
bore and
that
the piston
seal
does not
become
twisted
or
trapped
as
it
enters the cylinder bore.
Engage
tbe lip
of the dust
seal
with the lip
on tlte
cylinder block face.
Reassemble
tbe cylinder
blocks
to the
caliper,
tighten
the
set
pins
to a
torque
wrench reading
of
8
lb.
ft.
(1
·11 kg.
m.)
wilb
tbe
!breads
greased, and
fit
the
bridge
pipe,
ensuring
that it
is
correctly
positioned
(with
the
near-vertical
part
of
the pipe
farthest
from the
wheel).
If
the complete
brake u
nit
has been
removed
it
should
be
replaced
as
detailed in Section M.l 0.
MGA (Twin
Cam).
Issue
2.
23026
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