Practice question

For Pennsylvania CDL air-brake operation, in the unloaded position, where do you expect air pressure to be in a properly working dual air system?

  1. Below 60 psi
  2. At full system pressure (typically about 125 psi after governor cut-out)
  3. Exactly 60 psi
  4. Exactly 200 psi

Answer: B — At full system pressure (typically about 125 psi after governor cut-out)

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