Air Brakes Practice Test - Mississippi
16.
Do NOT use the parking brakes:
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to test that they work.
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when you leave your vehicle.
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if the brakes are very hot.
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when you park for less than two hours.
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17.
The use of air brakes on a steep downgrade is only a supplement to:
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the use of the parking brakes.
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the use of the "controlled braking" method.
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the use of the spring brakes.
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the braking effect of the engine.
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18.
Most heavy-duty vehicles use:
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dual air brake systems.
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single air brake systems.
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pump-the-brake systems.
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triple air brake systems.
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19.
When you apply the brakes, the brake shoes and linings are pushed against:
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the supply pressure gauge.
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the S-cam.
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the safety relief valve.
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None of the above.
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20.
Your truck has a dual air system. If either system is very low on pressure:
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the ABS will not work properly.
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the tractor protection valve will not work properly.
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the low pressure warning signal will stop working.
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either the front or the rear brake will not be fully operational.
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