In the hydraulic brake road test, the apparatus loaded to its GVWR must stop from 30 mph within not more than how many feet?

• A. 70 feet
• B. 120 feet
• C. 88 feet
• D. 100 feet

Answer: (C)

The test is measuring braking performance under the heaviest practical load, so inertia and traction at maximum weight are key factors. When the apparatus is loaded to its GVWR and braking from 30 mph, the system must be able to bring the vehicle to a complete stop within a specific distance. That distance is 88 feet. Keeping the stop within 88 feet demonstrates that the braking system, tires, and weight distribution work together effectively even at maximum mass, providing a safe margin for stopping on the road.

If the stop requires more than 88 feet, it indicates the braking capability isn’t sufficient under loaded conditions, which is why 88 feet is the standard threshold. The other distances listed don’t reflect this standard requirement and aren’t used as the performance benchmark.