TX CDL AIR BRAKES PRACTICE TEST
11.
To test the low pressure warning signal, you should:
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manually let the air out of your brakes and see if the signal comes on.
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pump the brakes while your vehicle is running.
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shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal until the low air pressure warning signal comes on.
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check the air hoses connected to the brake chambers to make sure they aren't cut.
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12.
You are coming down a long, steep downgrade. Which of the following is a sign that your brakes may have started to fade?
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The brake pedal feels spongy or goes to the floor.
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You hear a loud "bang".
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You have to apply your brakes harder and harder to get the same stopping power.
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The steering feels heavy.
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13.
If the spring brakes do not release when you push the trailer air supply control, you should:
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rev or
lug the engine.
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check the electrical cables.
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pump the brakes.
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check the air line connections.
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14.
The ________ brake system applies and releases the brakes when the driver uses the brake pedal during normal driving.
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emergency
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anti-lock
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parking
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service
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15.
If your truck has automatic transmission, you should downshift:
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when you need to accelerate.
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whenever road conditions allow.
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when going down grades.
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after entering a curve.
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