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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 3 of 200
Correct33%1 of 3 answered
Incorrect67%2 of 3 answered

What is the purpose of a pressure-protection valve?

ACut air to non-essential accessories if service pressure falls too lowCorrect answer
BIncrease the pressure used by air seats
CApply the spring brakes at cut-outYour answer
Incorrect.

It preserves service-brake air by cutting accessories off, commonly at a preset 60 to 90 psi. (Guide p. 184)

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