During the air brake road test, the apparatus loaded to its GVWR must come to a complete stop from 20 mph within not more than how many feet?

• A. 50 feet
• B. 35 feet
• C. 60 feet
• D. 25 feet

Answer: (B)

The test focuses on braking performance of a heavy vehicle with air brakes when it’s at its maximum allowed weight. From a speed of 20 mph, a vehicle loaded to its GVWR must come to a full stop within 35 feet. This ensures the brakes can safely dissipate the momentum of a fully loaded vehicle without requiring excessive distance. The distance is measured from when the brakes are applied at 20 mph until the vehicle comes to a complete stop. If more distance is needed, it signals a braking system or air-brake issue that needs inspection.