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Front #84

ABTH 100.10B

When conducting a Class 1A air brake test, what percentage of the air brakes must be operative? Select the best answer.


  1. 90%
  2. 95%
  3. 100%
  4. 97%
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ABTH 100.10B


Answer: 100%
Feedback:
At designated locations, trains may receive a Class 1A Air Brake Test. 100% of the brakes must be operative. Any cars that release prior to the signal being given can be retested once. To pass retest, brakes must remain applied for no less than 3 minutes.