CO CDL AIR BRAKES PRACTICE TEST
21.
The spring brakes come on:
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when you bring the vehicle to a complete stop right away.
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when main air pressure is lost.
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when you lose ABS control.
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when air pressure in both air brake systems rises to a value set by the manufacturer.
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22.
Before starting down a hill, you should:
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release the accelerator and shift to Neutral at the same time.
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apply the brakes hard.
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slow down and shift to a lower gear.
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look for an escape route.
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23.
If are being followed closely, you should:
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flash your brake lights.
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increase your following distance.
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change lanes quickly.
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decrease your following distance.
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24.
The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
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it is a safe-driving brake.
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"S" stands for "Shoes".
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it is shaped like the letter "S".
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it applies a "Shock" to the brakes.
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25.
When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
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Never.
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When you are conducting your pre-trip inspection.
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When the tank pressure falls to the "cut-in" pressure.
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Only while you are taking a rest break.
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