AIR BRAKES PRACTICE TEST - MARYLAND
21.
In air-operated disc brakes, the pressure of the ______ on the ______ turns a "power screw".
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slack adjuster; tie rod
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brake camshaft; tie rod
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brake chamber; slack adjuster
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slack adjuster; cam roller
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22.
Spring brakes:
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will come fully on when air pressure drops to a certain range, typically 20 to 30 psi.
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will apply the brakes when a leak in the air brake system causes all the air to be lost.
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are usually held back by air pressure.
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All of the above.
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23.
If you are being tailgated, you should:
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avoid tricks like turning on your taillights or flashing your brake lights.
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avoid quick changes.
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increase your following distance.
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All of the above.
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24.
Some vehicles have a separate air tank which can be used to:
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hold the vehicle or combination of vehicles stationary.
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release the spring brakes.
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turn on the 4-way emergency flashers.
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unload cargo or passengers.
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25.
Which of the following is not a way to know when to change gears?
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Use road speed (mph)
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Use engine speed (rpm)
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Watch your tachometer
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Check that the pressure gauge shows normal oil pressure
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