BC Transit – Air Brake Course

Stopping Distance
Stopping distance consists of four factors...
1) Perception Time: (also described as see-think time) = the time it
takes the brain to recognize a hazard. Usually 3/4 second or 13 meters travel.
2) Reaction time: (also described as Do Time) = it is the time required
for your brain to tell your foot to apply the brakes. Usually 3/4 of a second
or 13 meters travelled.
3) Brake Lag: the time required for air to travel through a properly
maintained air brake system and actually begin applying the brakes.
Usually 4/10 of a second.
4) Braking Distance: the time or distance a vehicle travels before
it stops after the brakes have been applied.
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