NC CDL General Knowledge Practice Test

Stab braking involves releasing the brakes only after the wheels lock up. This technique is primarily used in emergency situations when a driver needs to stop quickly, such as when losing traction on slippery surfaces. The process starts with the driver applying the brakes firmly until the wheels lock up, causing the vehicle to skid. Once the wheels are locked, the driver must then release the brakes to regain traction, and as the wheels start to roll again, the driver can reapply the brakes. This method helps maintain vehicle control and can prevent a complete loss of steering ability that often occurs when the brakes are held continuously during a skid. The other options do not accurately describe stab braking. Gradually applying the brakes does not achieve the rapid stop needed in emergencies. Pressing the brake continuously can lead to locked wheels without the necessary release to regain control. Lastly, using the engine brake only does not encompass the idea of immediate stopping, which is a critical aspect of stab braking in urgent situations.