True/False
Indicate whether the
statement is true or false.
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1.
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All vehicles built after 1991 have automatic slack adjusters.
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2.
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Air brakes are faster than hydraulic brakes because air moves faster than
hydraulic fluid.
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3.
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If your vehicle has an alcohol evaporator, you should check and fill the alcohol
level daily in cold weather.
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4.
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The brake pedal used by a driver applies and releases the service brakes.
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5.
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Vehicles that have manual drains on air tanks must be drained at the end of each
day.
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6.
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When a low pressure warning device comes on, you have up to an hour before you
have to stop.
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7.
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The air compressor governor controls the air pressure applied to the
brakes.
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8.
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When driving a tractor-trailer combination with ABS air brakes, you should brake
normally, regardless of whether you have ABS on the tractor, the trailer or both.
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9.
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If your antilock brake system (ABS) malfunctions and is not working, you have no
brakes.
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10.
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The service brake system is the brake system that applies and releases the
brakes when the driver uses the brake pedal.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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11.
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Why should compressed air storage tanks for the air brake system be drained of
water?
a. | Water pressure reduces braking effectiveness. | b. | Water in the tanks
can freeze in cold weather and cause brake failure. | c. | Oil and water in the brake lines can mix and
brake the compressor. | d. | None of the
above. |
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12.
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Modern air brake systems combine three different systems. They are the
service brake system, the parking brake system and the ______________ brake system.
a. | Foot. | b. | Drum. | c. | Differential. | d. | Emergency. |
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13.
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On vehicles with air brakes, there must be an air pressure warning signal that
comes on before air pressure in the service brake tanks falls below _______ psi.
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14.
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The air compressor governor controls:
a. | The air that flows to the air pressure gauge. | b. | The air pressure
applied to the brake drums. | c. | When air is pumped into the air storage
tanks. | d. | The release of air pressure from the brake chambers. |
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15.
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The application pressure gauge tells you how much air pressure:
a. | You have used so far. | b. | Is contained in the air storage
tanks. | c. | Is in the tires. | d. | You are applying to the
brakes. |
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16.
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What does an alcohol evaporator do?
a. | Reduce alcohol in the air tanks. | b. | Add alcohol to the air
tanks. | c. | Reduce the risk of ice in the air brake system in cold weather. | d. | Eliminate the oil in
the air brake compressor. |
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17.
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A straight truck air brake system should not leak at a rate of more than _____
psi per minute with the engine off and the brakes released.
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18.
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The air loss rate for a straight truck with the engine off and the brakes
on should not be more than:
a. | 1 psi in 30 seconds. | c. | 3 psi in one minute. | b. | 1 psi in one minute. | d. | 2 psi in 45
seconds. |
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19.
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If you must make an emergency stop, brake so you:
a. | Lock up all brakes until you stop. | c. | Heat the brakes
completely. | b. | Can steer and keep your vehicle in a straight line. | d. | Use the hand brake
first. |
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20.
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Anytime a low air pressure warning device comes on, you should:
a. | Continue driving to the closest maintenance facility. | c. | Come to a safe stop and then
continue driving once the device re-sets. | b. | Report the low air warning to your company and
have the vehicle checked at the next required maintenance inspection. | d. | Come to a safe stop as soon as possible, and
continue only when the air system has been fixed. |
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