Skateboards can get going really fast and can pick up some serious speed. The Disc Brakes for Longboard project on Kickstarter is devising a system to slow it down. As noted by the name this essentially adds a braking system to boards.
This brake design, which was devised by Benjamin Newman, consists of two independent core clutches; an outer aluminum drum that is lined with friction material while an inner core is made of stainless steel. A pair of spring-loaded levers can be used to apply the brakes.
Unlike foot braking or power-sliding this doesn’t require the same level of riding skill, and more importantly can be used on hill descents or on flats. It can even be retro-fitted to existing boards, while pushing and sliding are not affected by the braking system.