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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 17 of 200
Correct59%10 of 17 answered
Incorrect41%7 of 17 answered
Labeled S-cam drum foundation-brake diagram
Follow force from the chamber to the drum.

Which sequence correctly describes an S-cam brake application?

AReservoir rotates, governor presses the rotor, spring drains
BBrake drum turns the compressor, then the foot valve closesYour answer
CPushrod moves, slack adjuster rotates the S-cam, linings contact the drumCorrect answer
Incorrect.

Chamber pushrod movement rotates the slack adjuster and S-cam, forcing the linings against the drum. (Guide p. 149)

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