Practice question

During the air brake pre-trip, how do you test that the spring brakes apply automatically?

  1. Apply the foot brake hard while driving
  2. Continue fanning the brakes until air pressure drops far enough; the spring brakes should apply between roughly 20 and 45 psi
  3. Pull the parking brake at 60 psi
  4. Drain the secondary tank only

Answer: B — Continue fanning the brakes until air pressure drops far enough; the spring brakes should apply between roughly 20 and 45 psi

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