Cessna T188C - Page 118

MODEL
188 &
T188
SERIES
SERVICE
MANUAL
b. Connect
a clean
hydraulic
pressure
source
such
5-56. REMOVAL
OF PARKING
BRAKE
SYSTEM
as a hydraulic
hand
pump
to the bleeder
valve
on the
COMPONENTS.
(See figure
5-10.) Components
of
lower end of
the wheel cylinder,
the knob-operated
parking brake
system are illustra-
ted
in the figure
on sheet 1. This
illustration
may be
NOTE
used as a
guide for
component
removal.
After
discon-
necting controls at the master cylinders, and removing
Ensure
that the free
end of the hose
from the
clamps along
the control
routing, the control
may be
master
cylinder
remains immersed
during
removed
from the instrument
panel
by loosening the
the entire bleeding
process,
locknut
and unscrewing
the knob
and face plate,
then
pushing
the control
forward, through
the panel. Com-
c. As fluid is pumped into
the system, observe the ponents
ofthe cable-operated system
are illustrated
Immersed end of the hose at the master cylinder for on sheet 2, which may be used as a guide during re-
evidence of air bubbles
being forced
from the brake
moval.
system. When bubbling has ceased, remove the
bleeder
source from the brake wheel
cylinder, tight- 5-57.
INSTALLATION OF PARKING
BRAKE. Re-
en the bleeder
valve and reinstall cap over
the valve, verse the procedures
outlined in the preceding
para-
d. Remove hose
from master cylinder and replace
graph to install the
parking brakes. Refer to the fol-
filler plug. lowing paragraph for rigging the knob-operated sys-
tem. On the cable-operated system, no adjustment is
5-55. PARKING BRAKE SYSTEM. (See figure 5-10.) provided. Replacement of worn or defective compo-
The
parking brake system consists
of a control knob nents will
restore the system to its correct
operation.
on the
instrument
panel,
which
operates
a
double con-
trol, one
control routing
to each
master
cylinder.
At
5-58.
PARKING
BRAKE SYSTEM
RIGGING.
the master cylinders, the control operates locking a. Check that end of each control housing extends
plates which lock the master cylinder piston rods through upper clamp 0. 10-inch, and that each support
down as toe pressure is applied
to the top of the rud-
assembly is clamped around master
cylinder 0.15-
der
pedals, trapping pressure in the
system. To re- inch from
top of cylinder as illustrated
in figure 5-10.
lease the parking brake, depress
the pedals after ma-
b. With parking brake control
full in, adjust both
king sure the parking brake knob is full IN. Beginning lower stops so that lower springs will return control
with 1968 Models, a "T" handle
parking brake system,
to full in position when it is pulled
out then released.
with the control mounted below the instrument panel, c. With parking brake control full in, adjust both
is used, and is
illustrated in figure
5-10, sheet
2. upper
stops so that
locking plates
lie flat against
top
This type of system uses a handle and ratchet mecha- of master cylinder.
nism, connected by a cable to linkage at each master d, Test-operate parking brake system several
cylinder.
Pulling out on the handle
depresses both times
to be sure that locking plates
cannot, under
master cylinder piston rods, and the ratchet locks any circumstances, be actuated as long as the control
the handle in this
position until the handle is turned
is full in. Conversely,
the locking plates must
be
and released. This system allows the brakes to be actuated when the control knob is pulled out.
set or released without the necessity of first depress-
ing the rudder pedals.
SHOP NOTES:
5-36