Practice question

Under Michigan CDL Manual Section 5, what can cause spring (parking) brakes to apply unexpectedly while driving?

  1. Driver pressing the foot valve too lightly
  2. Air pressure dropping below the spring brake apply range (about 20-45 psi), often from a major leak
  3. Cold weather
  4. Slow traffic

Answer: B — Air pressure dropping below the spring brake apply range (about 20-45 psi), often from a major leak

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