BC Transit – Air Brake Course

Brake Lag Time
...is the time it takes for air to travel through a properly maintained system.
high volume - slow moving
low volume - fast moving
•Lag time is dependent, however, on the inside diameter of the brake line through
which the air is travelling.
• In the two examples pictured here, the air will travel faster through the smaller
diameter line and slower through the larger diameter line.
• However, the larger diameter line is capable of delivering a much greater volume of
air, as opposed to the smaller line which delivers a much smaller volume of air.
Click for animation (once for each pipe)
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