Union Pacific Air Brakes
Exam Questions and
Answers
What is the minimum PSI the brake system must be charged to as indicated by a gauge
or device at the rear of your train? - Answer-75 PSI
During the last 1 minute wait, what is the maximum allowed leakage? - Answer-5 PSI
What is the proper piston travel for body mounted brake cylinder? - Answer-Between 6-
9 inches
What is the function of a retaining valve in the HIGH PRESSURE (HP) position? -
Answer-retains 20 pounds set.
Would a Class 1 air brake test need to be done on a solid block of cars being added to
your train? - Answer-No, its already been performed
When would a class 1 air brake test need to be performed on a portion of the train or on
cars added to the train? - Answer-when they are not a solid block
If trains have been separated for more than 4 hours, what air brake test is required after
re-coupling to cars? - Answer-Class 1
Before starting an air brake test the rear of the train must be charged to ____ PSI. -
Answer-75
During an air brake test, what brake pipe reduction must the engineer make when the
signal is given to apply the air brakes? - Answer-20 pounds
How many times can a car's air brake test be retested? - Answer-once
During a retest, brakes must remain applied for a minimum of ____ minutes. - Answer-3
How much of the trains air brakes must be operational when departing the terminal? -
Answer-100%
Exam Questions and
Answers
What is the minimum PSI the brake system must be charged to as indicated by a gauge
or device at the rear of your train? - Answer-75 PSI
During the last 1 minute wait, what is the maximum allowed leakage? - Answer-5 PSI
What is the proper piston travel for body mounted brake cylinder? - Answer-Between 6-
9 inches
What is the function of a retaining valve in the HIGH PRESSURE (HP) position? -
Answer-retains 20 pounds set.
Would a Class 1 air brake test need to be done on a solid block of cars being added to
your train? - Answer-No, its already been performed
When would a class 1 air brake test need to be performed on a portion of the train or on
cars added to the train? - Answer-when they are not a solid block
If trains have been separated for more than 4 hours, what air brake test is required after
re-coupling to cars? - Answer-Class 1
Before starting an air brake test the rear of the train must be charged to ____ PSI. -
Answer-75
During an air brake test, what brake pipe reduction must the engineer make when the
signal is given to apply the air brakes? - Answer-20 pounds
How many times can a car's air brake test be retested? - Answer-once
During a retest, brakes must remain applied for a minimum of ____ minutes. - Answer-3
How much of the trains air brakes must be operational when departing the terminal? -
Answer-100%
