AIR BRAKES PRACTICE TEST - PENNSYLVANIA
16.
The parking or emergency brakes of trucks or buses must be held on by:
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hydraulic pressure.
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air pressure.
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fluid pressure.
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spring pressure.
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17.
If your truck has automatic transmission, you should downshift:
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whenever road conditions allow.
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after entering a curve.
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when you need to accelerate.
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when going down grades.
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18.
In air-operated disc brakes, the pressure of the ______ on the ______ turns a "power screw".
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brake chamber; slack adjuster
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slack adjuster; cam roller
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brake camshaft; tie rod
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slack adjuster; tie rod
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19.
Foundation brakes are used:
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only with the front wheels.
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only with the right wheels.
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only with the rear wheels.
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at each wheel.
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20.
Front wheel braking is good:
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only in good weather.
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under all conditions.
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Never.
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only in wet conditions.
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