AZ CDL AIR BRAKES PRACTICE TEST
11.
The safety valve is usually set to open at:
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100 psi.
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150 psi.
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200 psi.
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12.
To check the slack adjusters on S-cam brakes, you should:
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release the parking brake valve and begin reducing the air pressure by stepping on and off the brake pedal.
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park on level ground, chock the wheels and release the parking brakes, then use gloves and pull hard on each slack adjuster that you can reach.
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park on level ground and fan off the air pressure by rapidly applying and releasing the foot brake.
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13.
Most heavy-duty vehicles use:
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dual air brake systems.
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triple air brake systems.
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single air brake systems.
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14.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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20 to 45 psi
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100 to 120 psi
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10 to 20 psi
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15.
Which of the following can cause brakes to fade or fail?
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Brakes out of adjustment
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Excessive use of the service brakes
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All of the above.
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