AIR BRAKES CDL PRACTICE TEST - WYOMING
16.
In a dual air brake system, if one air system is very low on pressure:
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you should drive and brake as you always have.
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you should pump the brakes to restore pressure.
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the effect won't be noticeable for the first 50 miles.
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either the front or rear brakes will not be operating fully.
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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 spring brakes.
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the use of the "controlled braking" method.
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the braking effect of the engine.
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the use of the parking brakes.
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18.
To check slack adjusters on S-cam brakes, you should:
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press the brake pedal and listen for any strange noises.
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use gloves and pull hard on each slack adjuster you can reach.
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check that the spring brakes come on automatically.
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All of the above.
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19.
The tractor protection valve:
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provides the air supply for the brake system.
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will close if you apply the parking brakes.
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will close automatically if the air pressure drops to a certain level.
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All of the above.
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20.
Spring brakes are usually held back by:
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the antilock braking system.
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the brake pedal.
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modulating control valves.
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air pressure.
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