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 TM
9-2320-279-20-1
Troubleshooting Malfunctions (Cent)
Table 2-9. Troubleshooting
Malfunction
Test or Inspection
Corrective Action
DUAL AIR BRAKE SYSTEM
5. PRESSURE DROPS OVER 25 PSI
AT GAGE WHEN BRAKES ARE APPLIED.
R
Check brake treadle valve for leaks.
Step 1.
Replace leaking treadle valve (para 11-10).
Step 2. Check for air leak at brake chambers.
11-8 or 11-9).
If air is leaking from brake chamber, replace
Step 3. Check for leaks at relay valve.
If air is leaking from relay valve, replace relay valve (para 11-12).
Check air lines for leaks.
Step 4.
Repair air lines
11-35).
5. SPRING BRAKES WILL NOT APPLY.
Step 1. Check brake adjustment.
11-7).
Adjust brakes
Step 2. Check for kinked or damaged air lines from parking brake valve in cab to spring brake.
11-35).
Repair kinked or damaged air lines or connectors
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