Georgia Commercial Driver License Practice Test

What typically happens if water freezes in the brake system?

1. Brake efficiency increases

2. Brake failure occurs

3. Brake temperature rises

4. Brake functionality remains unchanged

The correct answer is: Brake failure occurs

When water freezes in the brake system, it can lead to brake failure. This occurs because the presence of ice can obstruct the fluid pathways and cause components such as brake lines or calipers to not function properly. Hydraulic brake systems rely on fluid to transfer force from the driver's foot on the pedal to the brake pads, and if the brake fluid contains ice or becomes contaminated with frozen water, the system may not respond effectively when the brakes are applied. Moreover, frozen water can expand as it transitions from liquid to solid, potentially leading to cracks or damage in brake components. This can make it difficult or impossible to apply adequate force to stop the vehicle, significantly compromising safety. Additionally, the effectiveness of the brake fluid is diminished, as it may not be able to convert mechanical force into braking action when needed. This is particularly hazardous for commercial drivers, who rely on their vehicle's braking system for safe operation under various conditions.