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Home/Practice quizzes/Single-unit air brakes

Single-unit air brakes practice quiz

Choose an answer, read the explanation, then continue to the next question. Your results include a review of every answer.

Single-unit air brakesQuestion 10 of 200
Correct60%6 of 10 answered
Incorrect40%4 of 10 answered

What compressor event ends the air-dryer purge phase?

AUntil the compressor resumes pumpingYour answerCorrect answer
BExactly one hour
CUntil reservoir pressure reaches zero
DOnly while the service brake is applied
Correct.

The purge port stays open through the unloaded interval and closes when the compressor starts pumping again. (Guide p. 180)

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Study aid only. These are not official ICBC exam questions, and practice scores do not predict an official test result.