Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual page 141

THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH
PROBLEM
Dragging brakes
(continued)
Brakes are spongy or
fail to operate.
Effective: 05/05/04
AIRCRAFT MAINTENANCE MANUAL
PROBABLE CAUSE
Restriction in hydraulic
lines or restriction in
parking brake valve.
Worn, scored or warped
brake disc (see Fig. 6-2
and 6-3).
Damage or accumulated
dirt restricting free
movement of wheel
brake parts.
Leak in system.
Air in system.
Lack of fluid in brakes.
Brake assemblies'
defective.
REMEDY
Have someone apply
and then release
brakes. Wheel should
rotate freely as soon as
brake is released. If
wheel fails to rotate
freely, loosen brake line
at brake housing to
relieve any pressure
trapped in line. If wheel
now turns freely, the
brake line is restricted.
Drain all brake lines and
clear the inside of brake
line. If cleaning the lines
fails to give satisfactory
results, the parking
brake valve may be
faulty and should be
repaired.
Visually check disc.
Replace brake disc and
lining if required.
Check parts for freedom
of movement. Clean
and repair or replace
parts as necessary.
Check entire hydraulic
system for leaks. If
hydraulic reservoir,
parking brake valve, or
wheel brake assemblies
are leaking, they must
be repaired or replaced.
Bleed system.
Check hydraulic
reservoir fluid level. Fill
and bleed if necessary.
Repair or replace as
required.
6-21