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SERVICE BRAKE(S) ON ONE AXLE DO NOT APPLY OR APPLY SLOWLY. (Cont) -725550570
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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. (Cont) -725550572
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.
NOTE
The relay valve test listed below applies to all
brake relay valves.
PRESSURE TEST
(1) Drain air from trailer air system
(2) Disconnect air hose 2545 from right
front brake chamber.
(3) Connect 0 to 160 psi (1103 kPa)
pressure gage to air hose 2545.
(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 valve output pressure is less
than 60 5 psi (414 34 kPa),
perform Steps (7) through (11)
below and replace relay valve
(b)  If valve output pressure is 65 psi
(448 kPa) or more and continues
to increase, perform Steps (7)
through (11) below and replace
multifunction valve (Para 4-52).
(c)  If valve output pressure is
60 5 psi (414 34 kPa), relay
valve is OK.
(7) Release brake pedal.
(8) Pull out trailer charge valve in truck.
(9) Turn OFF ENGINE switch.
(10) Disconnect air hose 2545 from
pressure gage.
(11) Connect air hose 2545 to right front
brake chamber.

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