Cessna T188C - Page 114

MODEL 188 & T188 SERIES SERVICE MANUAL
5-34.
TROUBLE SHOOTING
- - - BRAKE
SYSTEM (Cont).
TROUBLE
PROBABLE CAUSE
REMEDY
BRAKES FAIL TO OPERATE. Air in system. Bleed system.
(Cont).
Lack of fluid
in master cylinders.
Fill and
bleed if necessary.
Defective
master
cylinder.
Repair or
replace
master cylinder.
5-35. BRAKE
MASTER CYLINDERS. (See
figure 5-9.) b. Install O-ring
(9) in groove in piston (14);
insert
piston spring (13) into piston, and slide assembly up
5-36. DESCRIPTION.
The brake master cylinders,
on bottom threaded
portion of piston rod
(3).
located just forward of the rudder
pedals, are actua-
c. Run nut (12) up threads to
spring (13). Tighten
ted by applying toe pressure
on the top of rudder pe-
nut enough to obtain 0. 040* 0. 005-inch
clearance be-
dais. A small reservoir is
incorporated in each mas-
tween top of piston and bottom
of Lock-O-Seal, as
ter cylinder to supply
it with hydraulicfluid.
shown in the figure.
d.
Install piston
return spring
(11) into cylinder
(10)
5-37. REMOVAL OF BRAKE MASTER CYLINDER. portion of body (7).
a. Provide drip cloth and container, then discon- e. Install piston rod (3) through spring (11).
nect hydraulic hose at master
cylinder. Protect
f. Slide compensating sleeve
(16) over rod (3).
hose and fitting from
dirt.
g. Install cover
(4) and screw (18).
b. Remove pins
attaching master cylinder
to rudder h. Install
jamb nut (2) and clevis (1).
pedal and structure.
i. Install filler plug (17),
making sure vent hole is
c. Remove
clevis
and
locknut
at top of
piston rod.
open.
d. Note location of parking brake clamps around j. Install setscrew (5).
master
cylinder,
then
loosen
clamps.
e. Slide
locking plate
off piston
rod as
master cyl-
5-41.
DISASSEMBLY
OF
BRAKE
MASTER
CYLINDER.
inder is pulled downward through
parking brake
(Beginning with 1979 Models.)
(See figure 5-9.)
clamps. Do not disturb
parking brake control
clamps a. Unscrew clevis
(1) and jam nut (2).
or stops.
b.
Remove filler
plug
(3).
c.
Unscrew cover
(4) and remove,
up over piston
5-38. DISASSEMBLY
OF
BRAKE
MASTER
CYLINDER
(5).
(Thru 1978 Models.) (See figure 5-9.) d. Remove piston (5) and spring (8).
a. Unscrew
clevis (1) and
jamb nut (2).
e. Remove
packing (7) and
back-up ring (6)
from
b. Remove screw (18). piston (5).
c Remove
filler
plug
(17) and
setscrew
(5).
d. Unscrew
cover (4) and
remove up over
piston
5-42. INSPECTION
AND REPAIR
OF BRAKE
MASTER
rod (3).
CYLINDER. (Beginning with
1979 Models.) (See fig-
e. Remove piston
rod (3) and
compensating sleeve
ure
5-9.) Repair is
limited to installation
of new parts
(16).
anc cleaning.
Use clean hydraulic
fluid (MIL-H-5606)
f. Slide
sleeve (16) up
over rod (3).
as a lubricant
during cylinder
reassembly.
Replace
g. Unscrew
nut (12)
from threads
of piston
rod (3).
packings
and
back-up rings.
Filler
plug (3)
must be
h.
Remove
piston spring
(13) and
O-ring (9)
from
vented
so pressure
cannot
build up during
brake
opera-
piston (14).
tion.
Remove plug
and drill 1/16-inch
hole, 30"
from
i. Remove
Lock-O-Seal
(15).
vertical,
if
plug is not
vented.
Refer to view
A-A for
hole location.
5-39.
INSPECTION
AND
REPAIR
OF BRAKE
MASTER
CYLINDER. (Thru 1978 Models.) (See figure 5-9.) 5-43. REASSEMBLY OF BRAKE MASTER CYLINDER.
Repair is limited
to installation of new components,
a. Install spring
(8) into cylinder body
(9).
cleaning
and adjustment,
Refer to applicable
para-
b. Install
back-up ring
(6) and packing
(7) in groove
graph
for adjustment.
Use clean
hydraulic
fluid (MIL-
of
piston (5).
H-5606) as a lubricant during reassembly of the cylin- c. Install piston (5) in cylinder body (9).
der. Inspect Lock-O-Seal
(Parker Seal Co. P/N
d. Install cover (4)
over piston (5) and screw cover
800-001-6), and replace, if damaged. Replace all into cylinder body (9).
O-rings. Filler
plug must be vented so
pressure can- e.
Install nut (2) and clevis (1).
not
build up in the reservoir during
brake operation. f. Install
filler plug (3), making sure
vent hole is
Remove
plug and
rill 1/16-inch
hole, 30'
from verti-
open.
cal, if plug is not vented.
5-44.
INSTALLATION
OF BRAKE
MASTER CYLIN-
5-40. REASSEMBLY OF BRAKE MASTER CYLINDER. DER. Reverse procedures in paragraph 5-37 to in-
(Thru
1978 Models.)
(See
figure
5-9.)
stall
master
cylinder.
Service
system
after installa-
a. Install
Lock-O-Seal
(15)
at bottom
of piston rod(3).
tion.
Check
parking brake
operation.
Refer
to appli-
cable
paragraph
for servicing
parking
brake.
5-32