Pennsylvania CDL Double/Triple Trailers Practice Test

What is the purpose of checking the tractor protection valve and trailer emergency brakes during air brake tests?

To verify the system protects the tractor and applies trailer emergency brakes when supply pressure is lost To measure cargo weight To test the power steering pump To prove the electrical cord is connected

Correct Answer:

To verify the system protects the tractor and applies trailer emergency brakes when supply pressure is lost

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