Practice question

A Florida CDL applicant is reviewing tractor protection valve check. Which statement is correct?

It is checked by lowering landing gear
The trailer air supply control should pop out in the manufacturer-specified low-pressure range, usually 20 to 45 psi
It should stay in at zero psi
It should pop out only above 100 psi

Answer: B — The trailer air supply control should pop out in the manufacturer-specified low-pressure range, usually 20 to 45 psi

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