CDL · Driving Tank Vehicles

What braking technique helps prevent skids and control surge when driving a tank vehicle?

Correct answer

Brake smoothly and gradually, beginning early and leaving extra following distance, because abrupt braking combined with surge can cause skids or push the vehicle forward

  1. A Brake hard at the last moment to stop quickly
  2. B Brake smoothly and gradually, beginning early and leaving extra following distance, because abrupt braking combined with surge can cause skids or push the vehicle forward
  3. C Pump the brakes rapidly on every stop regardless of the system
  4. D Rely only on the trailer brakes to stop

Why this is the answer

Smooth, controlled, early braking is the core skill for tank vehicles. Because liquid surge pushes the truck forward when you brake, and because a high center of gravity reduces stability, sudden hard braking can cause a skid or even contribute to a rollover. The manual recommends increasing your following distance, anticipating stops, and applying the brakes gradually so the liquid does not build a strong forward wave. If the vehicle has antilock brakes, you still brake smoothly; ABS helps you keep steering control during hard braking but is not a substitute for leaving room and slowing early.
Source: FMCSA CDL Manual 8.2.5 Braking Tank Vehicles

Practice more questions

This question is from our CDL Practice Tests practice test. Take the full practice test to test your knowledge across all Driving Tank Vehicles and other topics.

Take the Tanker practice test →

New to this exam? Our CDL exam guide explains the format, scoring, and how to prepare.

Related questions

State-specific guides

Need information for your state? Our state guides cover local requirements, fees, and what to expect on exam day.