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Front #34

ABTH 103.9

The brakes are applied, and a brake release occurs unintentionally. What step do you take? (Select the best answer.)

  1. Increase the brake pipe reduction at least 15 psi below the last effective brake pipe reduction.
  2. Decrease the brake pipe reduction at least 5 psi below the last effective brake pipe reduction.
  3. Increase the brake pipe reduction at least 5 psi below the last effective brake pipe reduction.
  4. No actions are needed.
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ABTH 103.9


Answer: Increase the brake pipe reduction at least 5 psi below the last effective brake pipe reduction.
Feedback:
Since brakes were applied prior to the unintentional release, the air brake system was not fully charged to the regulating valve setting. To ensure the brakes reapply, the brake pipe reduction needs to be 5 psi deeper than the previous reduction that applied the brakes. For example: The brake pipe was at 80 psi when an unintentional release occurs. After you reapply, the brake pipe should be at 75 psi.