[Rishi]

Well in the mountains or in places where the brakes are used very often, the brakes get very hot causing the brakes to fail. Well how about if a rim was designed in a spiral form to "pull" the air toward the inner rim (where the brakes are located) and would constantly keep the brakes cool.

Reward: These rims on my car

The brakes get hot because they are reducing the momentum o f the vehicle. The inertia of the vehicle implies that the mechanical energy has to be converted into some other form of energy. A part of the energy goes to grinding the brake pad material. A part is converted to heat. Whatever gear one is in, it is the total mass and the velocity that decides the braking effort and hence the heat produced.

Regenerative braking is one option, wherein on partially pressing the brake pedal, the shaft engages a dynamo, which generates power to charge the battery. The oteher option is where the dynamo power is wasted as heat in a heating coil immersed in water. In an emergency, pressing the lever all the way will apply the regular brakes.

Cooling the brake drum is a good idea. However, a spiral may not work too well. One can easily pipe cooling air with a hose to the required spot Th blower can be driven by the shaft and can kick in when the brake is applied adding to the braking effort.

rishi

[PBShop]

Also have like 16 gears, all they do is downshift. They hardly ever use brakes when comming downhill because thier brakes cannot handle it, you have all heard the loud noise they make when they downshift. So that is a great way to go downhill in your car, and if you rpms are too high that is when you need to use your brakes to get in the proper range.
Of course on big hills they usually provide a run away ramp for when those big trucks do overheat and thier brakes fail, and if professional drivers mess up sometimes, you certainly can't trust inexperienced drivers either. I would hate to be the one behind the guy whos brakes fail!

[S13240]

I'm not sure if you guys have ever found out exactly what temperature most modern brakes can function to. The caliper and the rim absorb a portion or the heat and dissapate it along with the rotor and bearrings. Unless you are riding the brake and the accelerator there really shouldnt be any need for extra break cooling, even if you live in the mountains or valleys. Aside from using the lower gears, if your vehicle has a manual transmission try downgearing and your breaks will last much longer. More importantly, if you are that worried about brake fade, Ie brake failure from over heating, use drilled, slotted, or drilled and slotted roters and permium pads. Many other more effective options then rims. Most cars are designed to bring air in through the front bumper into the wheel well, not through the rim.