Practice question

For the Washington CDL Air Brakes knowledge test, should you couple glad hands while pressurized air is flowing through them?

  1. Yes — pressurized coupling is best
  2. No — supply air should be off; couple the glad hands first, then charge the system
  3. It doesn't matter
  4. Only with double-trailers

Answer: B — No — supply air should be off; couple the glad hands first, then charge the system

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