Which vehicle is especially prone to brake loss on downhill roads?

• A. Trucks
• B. Buses
• C. SUVs
• D. Motorcycles

Answer: (A)

On a downhill, the energy you have to dissipate with the brakes goes up with the vehicle’s weight. Heavier vehicles like trucks convert more of their kinetic energy into heat in the braking system, so the brakes heat up quickly. When brakes overheat, their ability to grip (friction) drops—a phenomenon called brake fade—which means you get less stopping power and longer stopping distances. Trucks often carry heavy loads and use brake designs that dissipate heat less efficiently, so sustained downhill braking pushes them toward fade faster than lighter vehicles. To manage this, use engine braking, downshift appropriately, and apply the brakes in steady, light pulses rather than riding them hard for a long stretch.