Assuming a Major Air Leak in Tractor-Trailer Combination That Will

question 19

Multiple Choice

Assuming a major air leak in tractor-trailer combination that will result in complete system air pressure loss,which of the following sequence of events will occur FIRST?

• A) trailer supply button pops out
• B) tractor protection valve trips to OFF
• C) spring brakes start to apply when hold-off air drops below 60 psi (4 bar)
• D) tractor inversion valve actuates

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