The disc brake or disk brake is a device for slowing or stopping the rotation of a wheel. A brake disc (or rotor in U.S. English), usually made of cast iron or ceramic composites ...
http://en.wikipedia.org/wiki/Disc_brake
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...that handles high torque with fewer parts to service. Durable, fully oiled lift cylinders prevent rusting, while wet disc brakes ensure minimum downtime and maximum operating performance by reducing maintenance costs and improving vehicle safety...
http://www.mmh.com/article/CA6701153.html
...load while a lower leaf spring handles the remainder, help the suspension to resist high input torque encountered with disc brakes. The design reduces vibration into the cab and onto the chassis to help provide a smooth ride without sacrificing...
http://www.truck.net/news/4416.html