Cessna 177 SERIES Service Manual

5-41. BRAKE MASTER CYLINDERS. f. Slide compensating sleeve (16) over rod (3).
g. Install
cover
(4) and
screw
(18).
5-42 DESCRIPTION. The brake master cylinders, h. Install jamb nut (2) and clevis (1).
located immediately
forward of the pilot's
rudder i.
Install filler plug (17),
making sure vent hole
is
pedals,
are actuated
by applying
pressure
at
the top
open.
of the rudder
pedals. A small
reservoir is incorpo-
j. Install
setscrew (5).
rated into each
master cylinder
for the fluid supply.
When dual brakes are installed,
mechanical linkage 5-47. BRAKE MASTER
CYLINDER INSTALLATION.
permits the copilot
pedals to operate
the master
cy-
a. Connect hydraulic
hoses to
brake master cylin-
linders.
ders and
install cylinders.
b. Connect brake master cylinders to rudder pedals
5-43. BRAKE MASTER
CYLINDER REMOVAL.
and connect parking brake linkage.
a. Remove
bleeder screw at wheel brake assembly
c. Install bleeder screw at wheel brake
assembly
and drain
hydraulic fluid from
brake cylinders.
and fill and bleed
brake system in accordance
with
b.
Remove front seats
and rudder bar shield
for ac- applicable
paragraph in
this section.
cess to brake master cylinders. d. Install rudder bar shield and install front seats.
c.
Disconnect parking brake
linkage and disconnect
brake
master cylinders from
rudder pedals.
5-48.
HYDRAULIC BRAKE
LINES.
d. Disconnect
brake master cylinders
at bottom
attach points.
5-49. DESCRIPTION. The brake lines are rigid
e. Disconnect
hydraulic hoses from
brake master
tubing, except for flexible
hose used at the brake
cy-
cylinders and remove
cylinders.
linder
and at the master cylinder.
A separate line
is
f. Plug or
cap hydraulic fittings lines
and hoses to
installed to connect each
brake master cylinder
to its
prevent
entry
of foreign
materials,
corresponding
wheel brake
cylinder.
5-44. BRAKE
MASTER CYLINDER
DISASSEMBLY.
5-50. WHEEL BRAKE
ASSEMBLIES. (Refer
to fig-
(Refer
to figure 5-13.
)
ure
5-4.)
a.
Unscrew clevis
(1) and jamb nut
(2).
b.
Remove screw (18).
5-51. DESCRIPTION.
The wheel brake
assemblies
c. Remove
filler
plug (17)
and setscrew
(5).
employ
a floating
brake
assembly
and a disc
which
is
d.
Unscrew cover
(4) and remove
up over piston
attached
to the main
wheel with the wheel
thru-bolts.
rod (3).
e. Remove piston rod
(3) and compensating
sleeve 5-52. WHEEL
BRAKE REMOVAL.
(Refer to figure
(16).
5-4.) Wheel brake assemblies can be removed
by
f. Slide sleeve
(16) up over rod (3).
disconnecting the brake
line (drain hydraulic
fluid
g. Unscrew
nut (12) from
threads of piston
rod (3).
when disconnecting
line) and removing
the brake
back-
h. Remove
spring
(13)
and O-ring
(9) from
piston
plate.
The
brake disc
is removed
after
the wheel
is
(14).
removed and
disassembled. To remove
the torque
i. Remove Lock-O-Seal (15).
plate,
remove wheel and axle.
5-45. BRAKE
MASTER
CYLINDER
INSPECTION
5-53.
WHEEL BRAKE
DISASSEMBLY.
(Refer to
AND
REPAIR.
(Refer to
figure 5-13.)
Repair
is
figure 5-4
for a breakdown
of wheel
brake
parts.
limited to
installation
of new parts,
cleaning
and ad-
This figure
may be used
as a guide
for assembling
justing.
(Refer to
reassembly
paragraph
for adjust-
the
wheel brakes.
ment. ) Use
clean hydraulic
fluid
(MIL-H-5606)
as a
lubricant
during
reassembly
of the
cylinders.
Inspect
5-54.
WHEEL
BRAKE
INSPECTION
AND
REPAIR.
Lock-O-Seal (Parker Seal Co. P/N 800-001-6)
and a. Clean all parts except brake
linings and O-rings
replace if damaged.
Replace all O-rings. Filler
in dry cleaning solvent and dry thoroughly.
plug (17) must be vented
so pressure cannot
build up b. Install
all new O-rings. If
O-ring reuse is nec-
in the reservoir
during brake operation. If plug (17) essary,
wipe with a clean, dry cloth saturated in
hy-
is not vented, drill
1/16-inch hole, 30 degrees from draulic
fluid and inspect for damage.
vertical (as
shown in the
figure)
NOTE
5-46. BRAKE MASTER
CYLINDER REASSEMBLY.
(Refer to figure
5-13. )
Thorough cleaning is important. Dirt
and
a. Install
Lock-O-Seal (15) at bottom of piston rod
chips are the greatest single cause
of mal-
(3).
functions in the hydraulic
brake system.
b. Install
O-ring (9) in groove
in piston (14); insert
piston spring (13) into piston,
and slide assembly up c. Check
brake lining for deterioration and maxi-
on bottom threaded
portion of piston rod (3). mum
permissible wear. (Refer to applicable para-
c. Run nut
(12) up threads to spring (13). Tighten
graph for maximum wear limit.
)
nut (12) enough to obtain 0. 040±0. 005-inch
clearance d. Inspect brake cylinder
bore for scoring. A
between
top of piston
and bottom of
Lock-O-Seal,
as scored
cylinder will
leak or cause rapid
O-ring wear.
shown in
the figure.
Install a new brake
cylinder if the bore
is scored.
d. Install piston return spnng (11) into cylinder
(10) e. If the anchor bolts on the
brake assembly are
portion of body (7). nicked or gouged, they shall be sanded smooth to pre-
e. Install piston rod (3) end through spring
(11). vent binding with the pressure
plate or torque plate.
5-20
Change
6

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)