Practice question

Under PennDOT CDL Manual Section 5, what is the trailer protection valve, and where is it located?

A check valve on the tractor that automatically isolates the tractor air supply from the trailer if a trailer line breaks
On the trailer axle
Inside the cab heater
On the drive shaft

Answer: A — A check valve on the tractor that automatically isolates the tractor air supply from the trailer if a trailer line breaks

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