Final answer:
Repeatedly pressing and releasing the brake pedal results in a loss of air pressure, which can reduce braking performance and safety.
Step-by-step explanation:
Repeatedly pressing and releasing (fanning) the brake pedal results in a loss of air pressure in the brake system. In contrast to filling a tire where increasing volume doesn't initially raise pressure significantly, the brake system operates on maintaining consistent pressure to function correctly. As per Pascal's principle, and considering the hydraulic brake systems as detailed in Figure 14.18, maintaining steady pressure is crucial. Each push of the brake pedal without sufficient time for pressure to rebuild can deplete the air in the reservoir, leading to diminished braking capacity. Therefore, it is vital to allow the system to regain its required pressure to ensure effective braking performance and safety.