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Page Title:
TRAILER BRAKES GRAB WHEN APPLIED. |
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 TM 9-2330-385-14
4-16. BRAKE SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
10. TRAILER BRAKES GRAB WHEN APPLIED.
INITIAL SETUP
Tools and Special Tools
References
Tool Kit, General Mechanic's: Automotive
TM 9-2320-364-10
(Item 50, Appendix J)
Equipment Condition
Pressure Test Kit (Item 34, Appendix J)
Engine OFF, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
Personnel Required
Wheels chocked, (TM 9-2320-364-10)
Two
Emergency and service air supply gladhand
connected to truck, (Para 2-22)
START
1.
TEST OPTIONS
KNOWN INFO
WARNING
Read WARNING
Pressure test.
Truck air system OK.
on Page 4-309
REASON FOR QUESTION
POSSIBLE PROBLEMS
Is load sensing valve
If load sensing valve is
Load sensing valve faulty.
misadjusted or fails opened,
adjusted correctly and sup-
Relay valve faulty.
extra air pressure will cause
plying 60 5 psi
Brake drums faulty.
brakes to lockup.
(414 34 kPa)?
Brake components faulty.
Adjust or replace load
sensing valve
NO
Verify repair, go to
Step 5 of this Fault.
YES
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