The trailer air supply control valve should automatically close when the air pressure falls to between ____psi. CDL The trailer air supply control valve should automatically close when the air pressure falls to between ____psi.A. 100 and 125.B. 60 and 85.C. 20 and 45.Answer: C. 20 and 45. Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+
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