Question 415 of 276 · Alberta Class 4 Knowledge Test
About how long does it take an air brake system to respond after the driver presses the brake pedal?
Exactly one answer is correct.
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Correct answer to question 415
- A: About 4/10 of a second
Explanation
Lag time is the time the air brake system needs to respond after pressure is applied to the pedal. Compressed air has to flow through the system before the brakes apply, which takes about 4/10 of a second.
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