Quantcast TRAILER BRAKES GRAB WHEN APPLIED. (Cont) -725550599

 

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TRAILER BRAKES GRAB WHEN APPLIED.
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TM-9-2330-385-14 Palletized Load System Trailer (PLST) Model M1076 Manual
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TRAILER BRAKES GRAB WHEN APPLIED. (Cont) -725550600
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.
When rod is disconnected from the valve
S
it should hang freely without interference
from other components. During testing of
load sensing valve, control rod must be
able to simulate a no load condition.
PRESSURE TEST
(1) Drain trailer air system (Para 2-21).
(2) Disconnect air hose 2660 from quick
release valve.
(3) Connect 0-160 psi (1103 kPa)
pressure gage to air hose 2660.
(4) Disconnect load sensing valve
control rod from axle (Para 4-53).
(5) Start engine (TM 9-2320-364-10).
(6) Push in trailer charge valve in
(7) While assistant fully applies brake
pedal, push up on control rod and
observe pressure gage.
(a)  If valve output pressure does
not go to 125 5 psi
(862 34 kPa), perform
Steps (9) through (14) below
and replace valve (Para 4-53).
(b)  If valve output pressure goes
to 125 5 psi (862 34 kPa),
go to Step (8) below.
(8) While assistant fully applies brake
pedal, pull down on control rod and
observe pressure gage.
(a)  If valve output pressure is less
than 30 5 psi (207 34 kPa),
perform Steps (9) through (14)
below and replace valve
(b)  If valve output pressure goes
to 30 5 psi (207 34 kPa),
valve is OK.
(9) Release brake pedal.
(10) Pull out trailer charge valve in truck.
(11) Turn OFF ENGINE switch.
(12) Disconnect air hose 2660 from
pressure gage.
(13) Connect air hose 2660 to quick
release valve.
(14) Connect control rod to axle.
(15) Adjust load sensing valve

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