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Front #125
ABTH 102.10
If on a grade, how much of a brake pipe reduction must be made before coupling air hoses to charge the brake pipe and prevent an undesired release of the cars?
Answer: 40 psiFeedback: When making a 40-psi reduction, cars will not release behind you after cutting in the air. If there is 50.5 psi or more in the system, a release of the brakes could be triggered. By making a 40-psi reduction, only 50 psi exists in the system.