Thrush Aircraft S2R-T660, Maintenance Manual

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THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE REMEDY
Restriction in hydraulic lines or
restriction in parking brake
valve.
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.
Dragging brakes. (Cont.) Worn, scored or warped brake
disc (see Fig. 6-2 and 6-3).
Visually check disc. Replace
brake disc and lining if
required.
Damage or accumulated dirt
restricting free movement of
wheel brake parts.
Check parts for freedom of
movement. Clean and repair
or replace parts as necessary.
Leak in system.
Check entire hydraulic system
for leaks. If hydraulic
reservoir, parking brake valve,
or wheel brake assemblies are
leaking, they must be repaired
or replaced.
Brakes are spongy or fail to
operate.
Air in system. Bleed system.
Brakes are spongy or fail to
operate. (Cont.)
Lack of fluid in brakes.
Check hydraulic reservoir fluid
level. Fill and bleed if
necessary.
Brake assemblies’ defective. Repair or replace as required.
6 -18
Effective: 12/17/03