Single-unit air brakes practice quiz

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Single-unit air brakesQuestion 21 of 200

Correct62%13 of 21 answered

Incorrect38%8 of 21 answered

How does a spring-brake modulator help the driver stop after primary-system pressure is lost?

AIt exhausts spring-chamber air in proportion to the service application.Correct answer

BIt increases drive-axle tire pressure.

CIt bypasses the secondary service brakes.

DIt locks the foot valve in the released position.Your answer

Incorrect.

A normal foot application makes the modulator proportionally exhaust spring-brake air, adding controlled spring force to the remaining front-brake effort. (Guide p. 167)

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