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Air Brake Practice Questions 2
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#1.
To test the low air warning device, the ignition switch must be turned on and air pressure must be:
Raised from the normal operating range until the device activates
Raised from zero until the device de-activates
Reduced from the normal operating range until the device activates
Reduced from 414 kPa (60 psi) until the device de-activates
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