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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 15 of 200
Correct53%8 of 15 answered
Incorrect47%7 of 15 answered
Quick-release valve between the foot valve and front brake chambers
The nearby exhaust path speeds brake release.

Why is the quick-release valve installed close to brake chambers?

ATo increase compressor cut-out pressureYour answer
BTo vent chamber air nearby so the brakes release quicklyCorrect answer
CTo hold spring brakes applied during driving
Incorrect.

A quick-release valve reduces release lag by exhausting chamber air near the chambers. (Guide p. 158)

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