Piper Cherokee Six - Page 298

NOTE
By
watching
the
fluid
pass
through
the
plastic
hose
at
the
fluid
reservoir
and
the
bleeder
fitting
on
the
gear
being
bled,
it
can
be
determined
whether
any
air
is
left
in
the
system.
If
air
bubbles
are
evident,
filling
of
the
system
shall
be
continued
until
all
the
air
is out
of
the
system
and
a steady
flow
of
fluid
is
obtained.
Should
the
brake
handle
remain
spongy,
it
may
be
necessary
to
disconnect
the
bottom
of
the
toe
brake
cylinders
(next
to
the
pedal)
and
rotating
the
cylinder
horizontally
or
even
above
horizontal
and
by
use
of
the
hand
brake
alone,
purge
the
air
from
the
system.
d.
Close
the
open
bleeder
fitting
on
the
gear
being
bled.
Close
the
open
bleeder
fitting
to
which
the
pressure
hose
is
attached;
then
close
the
pressure
unit
and
remove
the
hoses
from
the
bleeder
fittings.
Check
the
brakes
for
proper
pedal
pressure.
Replace
the
caps
over
the
bleeder
fittings.
NOTE
It
may
be
necessary
to
remove
any
trapped
air
in
the
top
of
the
wheel
brake
unit
by
applying
pressure
to
the
system
with
the
brake
hand
lever
and
slowly
opening
the
bleeder
and
release
the
hand
lever.
e.
Repeat
this
procedure.
if
necessary,
on
the
other
gear.
f.
Drain
excess
fluid
from
the
reservoir
to
fluid
level
line
with
a
syringe.
6-48.
BRAKE
SYSTEM
LEAK
CHECK.
a.
Pull
for
a
good
firm
hand
brake
and
lock
parking
brake
mechanism.
Allow
system
to
stand
for
approximately
10
minutes;
then
by
gripping
the
parking
brake
handle,
it
should
not
be
able
to
be
pulled
aft
further
than
the
original
set.
Should
the
handle
be
able
to
be
pulled
towards
the
panel
and
feel
spongy,
a
leak
is
present
at
some
point
in
the
system.
This
leak
may
appear
at
any
one
of
the
connections
throughout
the
system
or
internally
in
the
master
brake
cylinder
or
wheel
brake
assemblies.
6-49.
BLEEDING
OF
THE
BRAKES
AFTER
A
UNIT
HAS
BEEN
CHANGED.
a.
Actuate
the
hand
brake
handle
until
some
pressure
builds
up
in
the
system.
At
this
time,
crack
the
attaching
B
nuts
at
any
of
the
hose
connections
of
the
replaced
unit.
Most
of
the
handle
sponge
feeling
should
be
displaced
by
this
action.
Retighten
B
nuts.
b.
Actuate
the
master
cylinder
and
the
toe
brake
cylinder
of
the
side
unit
which
was
changed
and
bleed
fluid
through
the
brake
assembly
on
the
wheel
by
pumping
pressure
and
cracking
bleeder
until
pressure
drops.
LANDING
GEAR
AND
BRAKE
SYSTEM
Revised:
6/18/76
PIPER
CHEROKEE
SIX
SERVICE
MANUAL
2B22