Practice question

During New Jersey CDL air-brake preparation, 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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Practice more: NJ CDL Air Brakes Test Practice Questions - New Jersey Commercial Driver License (CDL) Air Brakes Knowledge Test Exam →