If a trailer is equipped with a service brake priority air system and all its reservoirs are empty,which of the following must occur before the trailer brakes can be released?
A) all service chambers must be charged
B) air tanks must be charged to 60 psi before the hold-off circuit is charged
C) the service signal circuit must be activated
D) spring brakes over one axle must be caged
Correct Answer:
Verified
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