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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 24 of 200
Correct58%14 of 24 answered
Incorrect42%10 of 24 answered

Why can a cold, badly adjusted S-cam brake create a false sense of security?

ACold drums always reduce chamber stroke to zero.
BThe low-air warning is disabled below freezing.
CThe spring brake automatically cages itself when cold.
DIt may still contact the cool drum during a normal application.Your answerCorrect answer
Correct.

An excessive-stroke brake may seem effective against a cool drum, then lose force as drum expansion demands more travel. (Guide pp. 190-191)

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