Practice question

Under ALEA CDL Manual Section 5, what is the proper way to confirm the trailer parking (spring) brakes work?

  1. Connect a fully charged trailer, release tractor parking brake, pull the red trailer air supply knob OUT, and gently try to move the rig forward in a low gear — it should hold
  2. Apply only the foot brake
  3. Drain the trailer tanks
  4. Disconnect the glad hands

Answer: A — Connect a fully charged trailer, release tractor parking brake, pull the red trailer air supply knob OUT, and gently try to move the rig forward in a low gear — it should hold

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