TM 9-2330-373-14 & P
Table 4-2. Troubleshooting (cont)
TEST OR INSPECTION
BRAKE SYSTEM (cont)
Step 7. Inspect brake shoe
retraction spring to
see if spring is weak
Replace brake shoe retraction
6. NO BRAKES OR WEAK BRAKES
Step 1. Check to see if shut off valves on towing vehicle are closed.
Open shut off valves.
Step 2. Inspect intervehicular air hose for proper connection.
Connect air hose properly.
Step 3. Check to see if semitrailer air reservoir drain cock is open.
Close air reservoir drain cock.
Step 4,. Check to see if air pressure is low.
Check air pressure gage on towing vehicle. Remove any restrictions in air lines. Make leakage test. With
air hose couplings connected and brake applied. coat couplings, connectors and fittings with soap and
water solution. No leaks are permissible.