Pennsylvania CDL Double/Triple Trailers Practice Test

Why should the driver avoid using the trailer hand valve as the normal way to control speed on a downgrade?

It can overheat or lock trailer brakes and may lead to jackknife It improves steering response in every curve It charges the trailer air tanks faster It is required by PennDOT for all hills

Correct Answer:

It can overheat or lock trailer brakes and may lead to jackknife

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