MN CDL AIR BRAKES PRACTICE TEST
16.
The Johnson bar is a valve that:
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is installed in the first tank the air compressor pumps air to.
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reduces the braking pressure to a safe level.
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works the trailer brakes.
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keeps air from going out if the air compressor develops a leak.
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17.
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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18.
Which of the following is TRUE about dual air brake systems?
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A dual air brake system has 2 separate air brake systems.
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most heavy-duty vehicles use dual air brake systems.
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Each brake system has its own air tanks, hoses and lines.
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All of the above.
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19.
Axle weight is:
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the weight transmitted to the ground by one axle or one set of axles.
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the weight of all the axles added together.
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the maximum safe weight your tires can carry at a specified pressure.
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the value specified by the manufacturer as the loaded weight of one axle.
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20.
When driving in very hot weather, the heat will increase the chances of:
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loss of hydraulic pressure.
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ABS malfunction.
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suspension system defects.
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tire failure.
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