CDL Tanker Endorsement Practice Exam

If you need to stop your tanker quickly due to an emergency, what technique should you use?

1. Emergency braking

2. Controlled or stab braking

3. Rapid deceleration

4. Soft braking

The correct answer is: Controlled or stab braking

The technique of controlled or stab braking is appropriate for stopping a tanker quickly during an emergency because it helps maintain control of the vehicle while minimizing the risk of losing traction or skidding. When using controlled or stab braking, a driver applies the brakes firmly and then releases them, allowing the wheels to regain traction before applying the brakes again. This technique is particularly important in a tanker situation, where the liquid contents can shift and make the vehicle more prone to instability during braking. This type of braking allows for effective modulation of the braking force, helping to prevent jackknifing or other loss of control scenarios that can occur when heavy loads are involved. It balances the need for quick deceleration with safety, ensuring that the driver can manage the vehicle and maintain control throughout the stop. In contrast, emergency braking may not provide the necessary control over a heavy tanker, as it often involves continuous pressure on the brake pedal, which can lead to a skid. Rapid deceleration can also be risky, as it may cause the load to surge forward, and soft braking does not provide the immediate stopping power required in an emergency situation. Therefore, controlling the braking action using the controlled or stab braking technique is the safest and most effective option in a critical situation.