maybe you should try renting a snowmobile first, just to see if you actually will enjoy sledding (which you probably will) and to give you a basic idea of what displacement gives out what amount of power, so you can judge how big of a sled by that, if that makes any sense at all. As for brakes, most new sleds have hydraulic brakes, much similar to your motocross bikes. They usually have a resevoir in the same place as your bike, except on the opposite side (where the clutch would be) polaris also makes a liqiud cooled hydralic braking system, im not sure what it the liquid cooling does though.
<font color=red>89/91 cr 125</font color=red>
<font color=blue>89 Yamaha SRV</font color=blue>