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Front #147

ABTH 103.5

To prevent locomotive brakes from applying when initiating an automatic brake application or when making additional split reductions, actuate the independent brake valve a minimum of ___ seconds prior to a brake pipe reduction and continue until exhaust stops, but no less than ___ continuous seconds for each brake pipe reduction.


  1. two; five
  2. one; 10
  3. one; five
  4. two; 10
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ABTH 103.5


Answer: two; 10
Feedback:
It is important to actuate before making an automatic brake pipe reduction and after the exhaust stops, but not less than 10 seconds for each brake pipe reductions to prevent air from reaching the brake cylinders.