AIR BRAKES PRACTICE TEST - IOWA
11.
If the spring brakes do not release when you push the trailer air supply control, you should:
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check the electrical cables.
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rev or
lug the engine.
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check the air line connections.
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12.
Service brakes should:
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always be checked before applying the brakes.
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only be checked by a mechanic.
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be checked before each trip.
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13.
A tank endorsement is:
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only required when transporting liquids.
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only required when transporting gases.
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required for both liquids and gases.
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14.
The safety valve installed in the first tank the air compressor pumps air is set to open:
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at 30 psi.
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if there is too much pressure.
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if there is too little pressure.
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15.
If stopped on a hill, how can you start moving without rolling back?
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Partly engage the clutch before you take your right foot off the brake, put on the parking brake if necessary.
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Press on the gas pedal, even if you have to roll back a little.
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Release the parking brake before you have applied enough engine power to keep from rolling back.
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