Commercial Driver License (CDL) Class B Practice Test

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Study for the Commercial Driver License (CDL) Class B Test. Study using multiple-choice questions, hints, and explanations. Prepare for your exam effectively!

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What happens if you do not apply brakes correctly while going downhill?

You can reduce fuel consumption
Your vehicle may increase speed dangerously
You risk high engine wear
The ride will become smoother

The correct answer is: Your vehicle may increase speed dangerously

When descending a hill or steep grade, it is critical to apply the brakes correctly to maintain control over the vehicle. If brakes are not applied properly, the vehicle may gain speed dramatically, leading to a situation where it could become difficult to control. This increase in speed can lead to challenges in steering and stopping, potentially causing accidents or losing control of the vehicle. Proper braking techniques, such as using engine braking in conjunction with maintaining a safe speed, are essential to prevent dangerous speed increases. The other options do not align with the realities of handling a vehicle on a downhill slope: reducing fuel consumption is not typically a benefit of poor braking, high engine wear is more related to excessive use of power or strain rather than braking alone, and the ride will definitely not become smoother if the vehicle is accelerating uncontrollably. Thus, understanding the relationship between brake application and vehicle speed on inclines is crucial for safe driving.