Emergency stab braking involves:

Emergency stab braking is a method of braking that is particularly effective in emergency situations when quick stopping is necessary, especially for a large vehicle like a truck. This technique involves applying the brakes firmly until the wheels lock up, then releasing the brake pressure to allow the wheels to begin rolling again. This cycle is repeated as needed to maintain control of the vehicle while bringing it to a stop.

The rationale behind this technique lies in the concept of traction. When the wheels are locked up, the vehicle may skid, which can lead to a loss of control. By releasing the brakes when the wheels lock and then reapplying them once they start turning again, the driver maximizes the braking effectiveness while maintaining steering control. This is crucial in a heavy vehicle, especially in slick conditions or during high speeds, as it helps in preventing a jackknife condition or a loss of balance.

Using light steady pressure on the brakes or gradually decreasing pressure would not be effective in an emergency situation where maximum stopping power is required. These approaches can lead to longer stopping distances and may not adequately address situations where immediate action is critical.