A
LUBRICATION
SYSTEM
SECTION
A22
CHANGING
THE
FLUID
IN
THE
BRAKING
SYSTEM
It
Is
advisable
to
dr.ln
all
the
hydraulic fluid from
both
front
and
rear
braking systems
at
Intervals
of
12000 miles.
The
reservoir and pipe lines will readily be
emptied
If
the
bleed nipple on
the
caliper unit, A, Fig. A14
Is
first fitted with a flexible
tube
and
then
slackened.
The
brake
lever
Is
then
operated
as many
times
as
may be necessary
to
pump
the
fluid Into a
container.
This method should be adopted
In
order
to
avoid
spillage
of
fluid on
to
such Items
as
brake
pads.
discs, tires, etc.
Disconnect
the
pipe line
at
the
caliper unit. making
sure
that
any oil draining from
the
pipe falls
clear
of
the
brake components, and remove
the
complete
caliper unit. Drain
out
any oil remaining Inside and
If
necessary. prise
the
pistons
apart
by
means
of
a
wooden
wedge,
to
drive
out
the
fluid.
Replenish
the
caliper unit with
the
correct
type
of
fluid (see section
F6)
and reassemble
to
the
machine.
Refill
the
reservoir and
the
pipe line
with
the
same fluid.
AIR
BUBBLES
IN
THE
FLUID
WILL
CAUSE
DANGEROUSLY
INEFFICIENT
BRAKES
AND
THESE
MUST
BE
EXCLUDED
BY
A
PROCESS
KNOWN
AS
'BLEEDING'
THE
BRAKE.
THIS
IS,
THEREFORE, A
VITAL
OPERATION
AND
IS
FULLY
DESCRIBED
IN
SECTION
F7
and
FB.
A16
c
Fig. A14. Draining hydraulic:
system
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