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ALL PARKING BRAKES DO NOT RELEASE.
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TM-9-2330-385-14 Palletized Load System Trailer (PLST) Model M1076 Manual
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ALL PARKING BRAKES DO NOT RELEASE. (Cont) -725550544
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
Trailer air system pressure must be 125
S
5 psi (862 34 kPa) to begin
troubleshooting the brake system. If the
air system pressure cannot be maintained,
refer to Air System Troubleshooting.
Air lines and valves listed in this
S
troubleshooting procedure are illustrated
and located in FO-2.
PRESSURE TEST
(1) Drain trailer air system (Para 2-21).
(2) Disconnect air hose 2022 from right
front brake chamber.
(3) Connect air hose 2022 to 0-160 psi
(1103 kPa) pressure gage.
(4) Start engine (TM 9-2320-364-10).
(5) While assistant pushes in trailer
charge valve in truck, observe
pressure gage (Para 2-22).
(a) If 125 5 psi (862 34 kPa) is not
measured, perform Steps (6)
through (9) below and replace
multifunction valve (Para 4-52).
(b) If 125 5 psi (862 34 kPa) is
measured, multifunction valve
is OK.
(6) Pull out trailer charge valve in truck.
(7) Turn OFF ENGINE switch.
(8) Disconnect air hose 2022 from
pressure gage.
(9) Connect air hose 2022 to right front
brake chamber.

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