Louisiana Class D Chauffeur's License Practice Test

What is the term used for the type of emergency braking that involves pressing the brake pedal hard, letting up when the wheels lock, and pressing the brakes again when the vehicle starts rolling?

1. Stab braking

2. Threshold braking

3. Controlled braking

4. Anti-lock braking

The correct answer is: Stab braking

The term used for the type of emergency braking that involves pressing the brake pedal hard, letting up when the wheels lock, and pressing the brakes again when the vehicle starts rolling is known as stab braking. This technique allows a driver to regain control of the vehicle by momentarily releasing the brakes to prevent a complete lock-up of the wheels, which can lead to losing traction and steering capability. By releasing the brakes when the wheels lock, the driver can avoid a skid and then reapply the brakes for optimal stopping power as soon as the wheels start rolling again. This method is particularly effective in emergency situations, ensuring that the vehicle can stop quickly while maintaining control. Other techniques like threshold braking and controlled braking are used differently; threshold braking aims to maximize braking force without locking the wheels, while controlled braking generally involves steady pressure on the brake pedal without allowing the wheels to lock. Anti-lock braking systems (ABS) automatically prevent wheel lock-up and allow for better control during hard braking but operate differently compared to stab braking, which is a manual technique.