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Tham khảo tài liệu 'motorcycle mechanics 2009 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | unit Brakes A 600-pound motorcycle-rider combination zipping along the road at 70 miles an hour represents a powerful force of kinetic energy energy stored up in a moving vehicle . A great effort is required to halt this mass that is traveling at high speed. Fortunately we are able to convert such kinetic energy to heat by means of the braking system. The main job of a braking system is to rapidly convert kinetic energy into heat through friction and dissipate that heat into the surrounding air. With leverage gained by mechanical linkage or the power boost gained from a hydraulic system the cycle rider is able to force a braking shoe or disc of friction material against a steel drum or brake disc to stop his or her machine. THEORY OF BRAKE ACTION Stopping a motorcycle depends on the efficiency of the braking system as well as the traction available between tires and terrain. If you apply the brakes too hard for available traction you will skid as your wheels lock up. The quickest stopping takes place just before lock up on any kind of terrain. Sliding a tire to a stop wastes time and rubber not to mention how dangerous it can be. Most motorcycles tend to nose dive as the brakes are applied. When the forks are compressed the trail specification is reduced and the overall wheelbase of the bike is lessened. These changes mean quicker less stable handling so be prepared for a different reaction rate from your machine when the forks are compressed during and just after braking Fig. 6-1 . Brake Linings Brake linings are made of asbestos that has been impregnated with special compounds to bind the asbestos fibers together. Some linings are woven of asbestos threads and fine copper wire. Other ingredients are added to brake lining compounds to produce improved characteristics such as water resistance durability fade and glaze resistance. Brake Fade and Glazing. When brake linings become overheated they lose a lot of their frictional properties. When this occurs even .
