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Front #138
ABTH 103.3A
When applying or reapplying the automatic brakes to control speed, the brake pipe reduction should be __ psi or less.
Answer: 15Feedback: 15 psi is almost 60% of total service braking. Needing any more force could indicate a dangerous malfunction in the braking system such as a blocked brake. If more than a 15 psi reduction is necessary to control speed, the crew must stop and determine why.