OPERATION UNDER USUAL CONDITIONS - Continued
PREPARATION FOR USE - Continued
Do not raise leveling leg assemblies unless trailer is connected to a towing vehicle or is
securely supported on jack stands. The trailer may fall, causing injury to personnel.
34. Have an assistant apply and release towing vehicle service brakes.
35. Check the trailer relay valve vents with each application and release
of towing vehicle
service brakes. Venting of air should be heard.
36. Check the air brake chambers
to insure they are not caged. (Ref WP 0006 00-3)