Cessna 188 Series Service Manual 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