Which braking system helps prevent wheel lock during heavy braking?

• A. Anti-lock Braking System
• B. Traction Control System
• C. Electronic Stability Control
• D. Hydraulic Brake Assist

Answer: (A)

Understanding how braking systems maintain tire grip and steering during hard stops is the key idea. The Anti-lock Braking System prevents wheel lock by monitoring each wheel’s speed and quickly modulating brake pressure. When a wheel begins to lock, the system releases pressure just long enough to let the wheel resume rotation, then reapplies pressure, repeating rapidly. This keeps the tire in rolling contact with the road, preserving steering control and often shortening stopping distance on slippery or uneven surfaces. You may feel a pulsing in the brake pedal as the system cycles.

Traction Control helps when accelerating by preventing wheel spin, not during heavy braking. Electronic Stability Control uses braking on individual wheels and engine adjustments to keep the vehicle on its intended path, especially in turns, but its primary role isn’t preventing lock during hard braking. Hydraulic Brake Assist increases braking force in emergencies, but it doesn’t manage wheel lock. Therefore, the system that best prevents wheel lock during heavy braking is the anti-lock braking system.