What is a common consequence of fanning the brake pedal?

What is a common consequence of fanning the brake pedal?

• A. Increased braking efficiency
• B. A loss of air pressure
• C. Reduced stopping distance
• D. ABS integration

Answer: (B)

Fanning the brake pedal means repeatedly and quickly pumping the brakes. In an air-brake system, each brake application uses up air from the reservoirs, while the compressor is busy replenishing that air. If you keep pumping, you discharge air faster than the system can refill it, so the overall brake system pressure drops. That drop can trigger a low-air warning and reduce braking effectiveness, which is why a loss of air pressure is the common consequence. The other options don’t fit the mechanic of how air brakes operate: pumping won’t inherently increase efficiency or shorten stopping distance, and ABS status isn’t directly changed by this pumping behavior.