Which of the following best describes the functions of a tractor protection valve (TP) ?

A) pressure protects the tractor air supply in the event of loss of pressure in a trailer
B) routes trailer supply air and service application signal to the trailer pneumatic circuits
C) blocks service signal air to the trailer until trailer air supply is activated
D) all of the above

Question

Tanishi Gupta · Accepted Answer

Final Answer : D, Explanation :  The tractor protection valve performs all the listed functions: it protects the tractor's air supply by cutting it off if the trailer loses pressure, routes air and signals for brake applications to the trailer, and prevents the service brake signal from reaching the trailer until the trailer's air supply system is properly charged.

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