TM 9-2330-371-14&P
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3.
Check position of brake valve on towing vehicle.
Move brake valve to release position.
If brake valve is correctly positioned, go to step 4.
Step 4.
Check for restriction in service air and emergency air lines.
If air lines or hoses are restricted, replace or repair as
required (para. 4-33).
If air lines or hoses are free of restriction, go to step 5.
Step 5.
Check for closed shutoff valves on towing vehicle.
Open valves if closed.
If valves are open, go to step 6.
Step 6.
C h e c k for weak or broken brake shoe tension spring.
If brake shoe tension spring is broken, replace (para. 4-40).
N O BRAKES OR WEAK BRAKES.
2.
Step 1.
Check for closed shutoff valves on towing vehicle.
Open valves if closed.
If valves are open, go to step 2.
Step 2.
Check intervehicular air hoses for proper connection to towing
vehicle.
C o n n e c t hoses properly.
If hoses are properly connected, go to step 3.
Step 3.
Check for open drain cocks in semitrailer air reservoirs.
Close drain cocks if open.
If drain cocks are closed, go to step 4.
Step 4.
Check air pressure gage on towing vehicle for low air pressure
indication.
Check air lines/connectors for restrictions.
Tighten connections; remove any restrictions from hoses. Repair
or replace as necessary.
If air pressure gage indicates normal, go to step 5.
Step 5.
Check for defective emergency relay valve.
If emergency relay valve is defective, replace (para. 4-38).
If emergency relay valve is not defective, go to step 6.
Step 6.
Check for grease on brake lining.
I f b r a k e l i n i n g h a s g r e a s e o n i t , r e p l a c e brake shoes (para 4-40).
If brake lining shows no grease, go to Step 7.
4-20.3
Change 1
