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TM 9-2330-398-24
2-56. PARKING BRAKE CONTROL VALVE REPLACEMENT (continued).
c. TEST
NOTE
• No leakage is permitted. Replace control valve if it leaks or does not operate.
•·Semitrailer must be coupled to prime mover or air source to perform test. Refer
to TM 9-2330-398-10.
1.
Pull out button (5) and check to see that spring brakes apply properly. If spring brakes do not apply properly,
Internal leakage is present.
2.
Apply soapy water around valve stem and check for leakage. If soapy water bubbles around valve stem, external
leakage is present.
FOLLOW-ON MAINTENANCE:
• Disconnect ground (refer to TM 9-2330-398-10).
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