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SERVICE BRAKES ON ALL AXLES DO NOT APPLY OR APPLY SLOWLY. (Cont) -725550566
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TM-9-2330-385-14 Palletized Load System Trailer (PLST) Model M1076 Manual
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SERVICE BRAKE(S) ON ONE AXLE DO NOT APPLY OR APPLY SLOWLY.
TM 9-2330-385-14
If air lines are disconnected when they are under 125 5 psi (862 34 kPa), they can whip around and
cause personal injury. Care should be exercised when disconnecting an air hose that is thought to be
under pressure.
PRESSURE TEST
(1) Drain trailer air system (Para 2-21).
(2) Disconnect air hose 2639 from front
brake relay valve.
(3) Connect air hose 2639 to 0-160 psi
(1103 kPa) pressure gage.
(4) Start engine (TM 9-2320-364-10).
(5) Push in trailer charge valve in
(6) While assistant fully applies brake
pedal, observe pressure gage.
(a)  If 60 5 psi (414 34 kPa) is
not measured at air hose 2639,
perform Steps (7) through (11)
below and replace quick release
(b)  If 60 5 psi (414 34 kPa) is
measured at air hose 2639,
quick release valve is OK.
(7) Release brake pedal.
(8) Pull out trailer charge valve in truck.
(9) Turn OFF ENGINE switch.
(10) Disconnect air hose 2639 from
pressure gage.
(11) Connect air hose 2639 to front
brake relay valve.
VERIFY REPAIR
(1) Start engine (TM 9-2320-364-10).
(2) Push in trailer charge valve in
(3) While assistant fully applies brake
pedal, observe brake operation.
(a) If brakes do not operate correctly,
fault not corrected. Perform
Steps (4) and (5) below and notify
DS Maintenance.
(b) If brakes operate correctly,
fault corrected.
(4) Release brake pedal.
(5) Pull out trailer charge valve in truck.
(6) Turn OFF ENGINE switch.

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