The replacement of drum brakes with disc brakes is a major trend

Update:23-03-2019
Summary:

The replacement of drum brakes with disc brakes is a ma […]

The replacement of drum brakes with disc brakes is a major trend
In 1900, Maybach first used drum brakes, but in the 1953 Le Mans competition, the three Jaguar cars with the new disc brakes achieved remarkable results due to their excellent braking performance, so the passenger car field gradually began. A disc brake with superior performance and more stable braking performance.
However, due to the forward movement of the vehicle's center of gravity during the braking process, the front wheel bears most of the braking force during the braking process, and the braking force that the rear wheel can provide is relatively weak. Therefore, until today, some low-end models are still in order to reduce The production cost, the rear wheel continues to use the drum brake, but with the gradual improvement of the disc brake technology and the cost reduction, it is only a matter of time before the rear drum brake is replaced by the disc brake like the front wheel.
What are the disadvantages of drum brakes compared to disc brakes?
With the development of automotive technology and the gradual upgrading of friction materials, there is almost no difference in the braking force between drum brake and disc brake, and the quality is lighter. Even the traditional drum brakes can be used because of their old technology. Lower maintenance and maintenance costs. But with such an advantage, why is it replaced by disc brakes? The reason is that its stability is poor.
The stability of braking performance is not only related to the performance of the vehicle, but also related to the safety during daily driving. However, thermal decay is an unavoidable problem in the braking field. No matter what kind of friction material, after the temperature gradually rises, its The braking performance that can be provided will plummet, and even a sustained high temperature may cause a complete loss of braking force and danger. Because of the structural design of the drum brake, the friction surface is located inside the drum brake housing, which causes the heat generated by the friction during the braking process to be difficult to propagate into the air as quickly as the disc brake, frequent or vigorous braking. The action will cause the drum brake to continue to heat up, resulting in a significant drop or failure of the braking force.
○ The braking force in the rain weather drops significantly, and it is easy to rust or completely rust.