TM9-2330-374-14&P
T a b l e 4-2.
O r g a n i z a t i o n a l Troubleshooting Table - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 5.
Check for closed shutoff valves on towing vehicle.
Open valves if closed.
If valves are open, go to step 6.
Step 6.
Check for weak or broken brake shoe tension spring.
If brake shoe tension spring is broken, replace (para. 4-40).
NO 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.
Connect 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.
S t e p 4.
Check air pressure gage on towing vehicle for low air pressure
Check air lines/connectors for restrictions.
indication.
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.
If brake lining has grease on it, replace brake shoes (para 4-40).
If brake lining shows no grease, go to step 7.
Step 7.
Check
for worn/worn
out brake lining.
If
brake lining
is worn, adjust brakes (para. 4-30).
If
brake lining
i s w o r n o u t , replace brake shoes (para. 4-40).
If
brake lining
is not worn, go to step 8.
S t e p 8.
Check for air leakage in air chamber (para. 4-30).
If air chamber is leaking, tighten connections.
If air chamber is not defective, go to step 9.
