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The brake effect of the brake disc is better than the drum brake

The brake effect of the brake disc is better than the drum brake

The brake disc of the disc brake is a round plate that also rotates as the car travels. The brake caliper is used to clamp the brake disc and generate braking force. Its relatively rotating brake disc is fixed. When the brake is applied, it clamps the brake disc to slow down or stop. What are the reasons for the brake effect of the brake disc better than the drum brake?
 
The brake force of the disc brake is weak, the actual drum brake area is large, the natural brake efficiency is not good, but the drum brake has the biggest problem, the heat is declining, and the strong limit brake will cause the brake drum to heat up, eventually leading to the gap change. Large, the brakes become longer and eventually become ineffective. However, the drum brakes have low cost and large braking force, so the trucks use drum brakes.
 
Many rear wheels of the car are also drum brakes, the cost is low, and the power of the car is small, and it is rarely used for extreme control, so the rear wheel drum brake is very economical. However, since the front wheel brakes with 75% of the force, it is the front and rear drum. Including a lot of rear-drive cars, front and rear disc brakes, but also the front brake disc is large, the back is smaller. The front is a hollow disc, the back is a solid disc and so on.
 
However, the disc brake has a gradual process, it is easy to control the braking force, and the brake disc touches the air surface when it rotates with the wheel, and there are few signs of thermal decay. The brake can maintain a good braking effect for a long time. Super sports cars, brake discs with ceramic fibers before and after, in order to avoid thermal decay.