AIR BRAKES PRACTICE TEST - DISTRICT OF COLUMBIA
16.
With the controlled braking method, you:
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apply the brakes as hard as you can without locking the wheels.
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apply the brakes all the way and release brakes when the wheels the lock up.
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push down on the brake pedal as hard as you can so that the wheels the lock up.
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None of the above.
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17.
Supply pressure gauges tell drivers:
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how much pressure the relay valves should send to the trailer brakes.
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how much air pressure they are applying to the brakes.
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how much pressure is in the air tanks.
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All of the above.
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18.
Typically an air system is fully-charged at:
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250 psi
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125 psi
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25 psi
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75 psi
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19.
In vehicles with air brakes, water and compressor oil in the bottom of the air tank:
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should be drained completely.
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should be added regularly.
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should not be removed.
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None of the above.
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20.
The safety relief valve is located:
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in the first tank the air compressor pumps air to.
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in the front brake.
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on the dashboard.
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on each end of the vehicle's axles.
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