Commercial Driver License (CDL) Class B Practice Test

How can you avoid problems caused by wet brakes?

1. Avoid driving through deep puddles

2. Use high speed through water

3. Apply brakes harshly once in water

4. Regularly check brake fluid

The correct answer is: Avoid driving through deep puddles

To effectively avoid problems caused by wet brakes, steering clear of driving through deep puddles is essential. When a vehicle traverses a deep puddle, water can get into the braking system, potentially causing the brakes to become less effective or to malfunction entirely. This is particularly critical for heavy vehicles, like those that require a Class B Commercial Driver License, where maintaining optimal braking performance is crucial for safety. Puddles can significantly reduce brake performance due to the water interfering with the brake pads and rotors, leading to a condition known as hydraulic brake failure. By avoiding situations where the brakes could become wet, drivers can help ensure that their braking system remains effective and responsive, thus enhancing overall road safety. The other options present tactics that would not contribute positively to managing wet brakes. For instance, using high speed through water can create splashes that may exacerbate the situation rather than prevent it. Harshly applying brakes once in water can cause wheel lock-up and further reduce control of the vehicle. Regularly checking brake fluid is good practice, but it does not directly prevent the initial issues caused by wet brakes in the first place.