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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 28 of 200
Correct29%8 of 28 answered
Incorrect71%20 of 28 answered

When the ABS detects one wheel locking, what does its modulator do first?

AApplies every spring parking brake
BReleases chamber air pressure at the affected wheelCorrect answer
COpens the supply-reservoir drain
DStops the engine-driven compressorYour answer
Incorrect.

The ECU commands a solenoid modulator to release brake-chamber pressure at the wheel that is approaching lockup. (Guide p. 185)

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