MS CDL AIR BRAKES PRACTICE TEST
16.
Supply pressure gauges tell you:
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how much air pressure you are applying to the brakes.
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how much pressure is in the air tanks.
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when the pressure in the system drops below 60 psi.
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when the air pressure in the tanks falls below 60 psi.
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17.
Brake drums or discs must not have cracks longer than ____ the width of the friction area.
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1/5
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1/4
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1/2
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1/3
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18.
A low air pressure warning signal:
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is required on vehicles with air brakes.
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is required on all vehicles without air brakes.
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is optional on vehicles with air brakes.
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None of the above.
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19.
Most heavy duty vehicles use ___ air brake systems for safety.
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triple
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reduced
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single
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dual
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20.
Foundation brakes are used:
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only with the rear wheels.
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at each wheel.
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only with the front wheels.
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only with the right wheels.
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