Practice question

Under PennDOT CDL Manual Section 5, what is the role of the one-way (check) valve at the supply tank?

It releases excess pressure
It keeps air from flowing back from the storage tanks to the compressor if the compressor or supply line fails
It dries the air
It activates the parking brake

Answer: B — It keeps air from flowing back from the storage tanks to the compressor if the compressor or supply line fails

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