Michigan CDL - Air Brakes Practice Exam

Under what conditions is front wheel braking effective?

1. Only in dry conditions

2. Under all conditions

3. Only on wet surfaces

4. Only on rough terrains

The correct answer is: Under all conditions

Front wheel braking is effective under all conditions because the design of a vehicle's braking system allows for the front wheels to handle a significant portion of the stopping force. This is due to the weight transfer that occurs as a vehicle decelerates; when you apply the brakes, the weight shifts forward onto the front wheels, increasing their traction. In dry conditions, the friction between the tires and the pavement is at its highest, allowing for optimal braking performance. However, even in wet or slippery conditions, front wheel brakes are still crucial as they can help maintain control of the vehicle and prevent skidding. Similarly, on rough terrains, the front wheel brakes can still provide effective stopping power, although the surface may affect their performance somewhat. In situations such as driving on icy roads, while the effectiveness may be reduced due to lower traction, front wheel braking can still contribute to slowing down the vehicle, as it aids in maintaining steering control. Therefore, front wheel braking's effectiveness is not limited to ideal conditions, making it essential for safe operation in various driving environments.