Answer :
Final answer:
When a major air leak happens in a tractor-trailer resulting in a total loss of air pressure, the first step consists of the spring brakes starting to apply when hold-off air drops below 60 psi to prevent any incoming threats.
Explanation:
The subject matter of this question covers the mechanical and pneumatics aspect in Engineering, particularly focusing on a tractor-trailer combination. When a major air leak occurs in a tractor-trailer combination resulting in complete system air pressure loss, the sequence of events that will transpire is methodically organized for safety reasons.
The first stage that manifests itself in this condition is that the spring brakes start to apply when hold-off air drops below 60 psi. This mechanism is purposed as an immediate response to potentially hazardous situations by initiating brake application thereby potentially averting danger. Subsequent events like the trailer supply button popping out or the tractor protection valve tripping off will occur subsequently following this initial response.
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