Practice question

How should a heavy vehicle driver check the slack adjusters on an air brake system during a pre-trip inspection?

  1. By visual inspection from the driver's cab while moving slowly
  2. By releasing the parking brake, pulling hard on each slack adjuster, and checking for movement exceeding 1 inch
  3. By pumping the brake pedal 20 times and checking if it gets stiff
  4. By checking if the brake drums are hot to the touch when parked

Answer: B — By releasing the parking brake, pulling hard on each slack adjuster, and checking for movement exceeding 1 inch

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