Final answer:
Stab braking is the action of releasing the brakes when the wheels lock up, to avoid skidding due to a loss of traction. It's important to understand the distinction between static and kinetic friction when learning to brake properly, as maintaining static friction by not locking the wheels ensures better control. So, the correct option is B) release the brakes when the wheels lock up
Step-by-step explanation:
Stab braking refers to a technique used to prevent a vehicle's wheels from locking up under heavy brake application. The correct answer to the question 'Stab braking occurs when you...' is B) release the brakes when the wheels lock up. This method involves quickly applying the brakes firmly and releasing them as soon as the wheels begin to lock up.
By doing this repeatedly until the vehicle comes to a stop, you avoid a continuous wheel lockup, which can lead to skidding.
Learning to modulate the brakes properly takes into account the relationship between static and kinetic friction. When the wheels are rolling without slipping, static friction is in action, providing the maximum amount of frictional force without losing traction.
However, when you brake too hard and the wheels stop turning while the car is still moving, kinetic friction takes over, causing the vehicle to slide.
This transition from static to kinetic friction results in a sudden loss of control and a decrease in stopping force, so easing off the brake pedal slightly as you come to a stop helps to keep the wheels rolling and maintain control, thanks to static friction.
So, the correct option is B) release the brakes when the wheels lock up