How a Brake System Works HS Karlsruhe（制动系统是如何工作的HS卡尔斯鲁厄）.pdf

Braking Systems How a Brake System Works Brake systems were designed to slow the vehicles wheel movement through friction. Today there are primarily two brake systems, ABS and non ABS systems (anti brake skid) one system is basic hydraulics that work with a master brake cylinder (which is connected to the brake peddle in the car) that supplies brake fluid pressure to the front brake calipers and rear brake wheel cylinders or brake calipers if so equipped. Source: /how_does_it_work/brakesystem.htm Drum brake Source: /wiki/Drum_brake (viewed 2008-04-04) A drum brake is a brake in which the friction is caused by a set of shoes or pads that press against the inner surface of a rotating drum. The drum is connected to a rotating wheel. History The modern automobile drum brake was invented in 1902 by Louis Renault, though a less- sophisticated drum brake had been used by Maybach a year earlier. In the first drum brakes, the shoes were mechanically operated with levers and rods or cables. From the mid- 1930s the shoes were operated with oil pressure in a small wheel cylinder and pistons (as in the picture), though some vehicles continued with purely-mechanical systems for decades. Some designs have two wheel cylinders. The shoes in drum brakes are subject to wear and the brakes needed to be adjusted regularly until the 1950s introduction of self adjusting drum brakes. In the 1960s and 1970s brake drums on the front wheels of cars were gradually replaced with disc brakes and now practically all cars use disc brakes on the front wheels, with many offering disc brakes on all wheels. However, drum brakes are still often used for handbrakes as it has proved very difficult to design a disc brake suitable for holding a car when it is not in use. Moreover, it is very easy to fit a drum handbrake inside a disc brake so that one unit serves for both footbrake and handbrake. Early type brake shoes contained asbestos. When working on brake