Combination air brakes practice quiz

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Combination air brakesQuestion 1 of 200

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A tractor may be placed out of service if the trailer supply valve fails to close before pressure falls below:

A60 psi

B20 psiCorrect answer

C45 psiYour answer

Incorrect.

The protection system must not permit tractor pressure to fall below 20 psi without closing the trailer supply. (Guide p. 172)

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