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Page Title: TRAILER BRAKES GRAB WHEN APPLIED. (Cont)
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TM 9-2330-385-14
10. TRAILER BRAKES GRAB WHEN APPLIED (CONT).
2.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck air system OK.
Pressure test.
Load sensing valve OK.
REASON FOR QUESTION
POSSIBLE PROBLEMS
Does brake relay valve supply
If relay valve applies too much
Relay valve faulty.
pressure, trailer service brakes
60 5 psi (414 34 kPa) to
Brake drums faulty.
will grab.
brake chambers?
Brake components faulty.
Replace relay valve
NO
Verify repair, go to
Step 5 of this Fault.
YES
4-310

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