What should be used to cool hot brakes/wheels/tires?

Using portable fans is the appropriate method to cool hot brakes, wheels, and tires. The primary function of these fans is to increase air circulation around the heated components, effectively dissipating heat. By directing a flow of cooler air toward the hot areas, the fans help lower the temperature gradually without introducing any foreign substances that could potentially damage the braking system or create additional hazards.

Employing water from hoses, while it might seem like a quick solution, can actually be dangerous due to the risk of steam and thermal shock, potentially damaging the components. Additionally, using fire extinguishers may not effectively cool the brakes and could hinder visibility and accessibility if there’s a fire, as they are designed primarily to suppress flames rather than cool components. Chemical agents are not ideal for cooling and can introduce contaminants that could adversely affect the brake systems.

Thus, the use of portable fans stands out as the safest and most effective method for cooling hot brakes, wheels, and tires in a controlled manner.