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Front #121

ABTH 102.6

Place in order the steps to reduce pressure in an overcharged air brake system:

  1. Move the automatic brake valve handle to Release.
  2. Make a full-service brake pipe reduction with the automatic brake.
  3. Charge the system to the required pressure.
  4. Adjust the regulating valve to the desired pressure.
  5. Wait at least 30 seconds after the brake pipe exhaust stops.
Back #121
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ABTH 102.6


Answer: 1. Adjust the regulating valve to the desired pressure. 2. Make a full-service brake pipe reduction with the automatic brake. 3. Wait at least 30 seconds after the brake pipe exhaust stops. 4. Move the automatic brake valve handle to Release. 5. Charge the system to the required pressure.
Feedback:
On some older locomotives, the regulating valve knob is located on the control stand. On newer locomotives, it can be accessed on the display screen. The brake system should be set to 90 psi. If it is higher than 90 psi, you must perform these steps.