Illinois CDL Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which vehicle component assists in slowing down a vehicle?

The engine

The tires

The brakes

The correct response focuses on the primary function of brakes in a vehicle. Brakes are specifically designed to create friction with the wheels, which is the main mechanism for reducing speed or stopping a vehicle. When the driver applies the brakes, it engages the braking system, allowing the vehicle to decelerate effectively.

While other components do play roles in overall vehicle dynamics, such as the engine providing power and the tires offering traction, the brakes are the dedicated system used for slowing down or stopping a vehicle. The suspension system also contributes to the vehicle's stability and handling but does not directly assist in the process of slowing down. The distinct purpose of the brakes makes them the essential component for this function.

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The suspension system

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