Which component primarily aids in preventing wheel lock-up?

The antilock brake system (ABS) is key to preventing wheel lock-up during braking. It achieves this through a sophisticated mechanism that monitors wheel speed and automatically adjusts brake pressure when it detects that a wheel is about to stop rotating. This process allows the driver to maintain steering control while maximizing braking efficiency. By preventing the wheels from locking, ABS enhances vehicle stability and improves stopping distances on slippery surfaces, allowing for safer driving conditions in emergencies.

In contrast, brake fluid, brake lines, and calipers play essential roles in the braking system, but they do not directly prevent wheel lock-up. Brake fluid transmits force from the brake pedal to the braking system. Brake lines serve to carry the brake fluid to the calipers. Calipers are responsible for clamping the brake pads against the brake rotor to create friction. However, none of these components have the capability to modulate brake pressure in response to wheel speed changes, which is the primary function of the antilock brake system.