If a Trailer Is Equipped with a Service Brake Priority

question 72

Multiple Choice

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

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