Why do new energy heavy trucks abandon drum brakes?

Why do new energy heavy trucks abandon drum brakes? Mainly because disc brakes have the following 5 advantages.

1. Good heat dissipation performance:The structure of the drum brake is relatively closed, and the heat generated during braking is difficult to dissipate. Long-term continuous braking can easily lead to heat accumulation, causing thermal exhaustion of the brake components. The brake linings on the brake shoes are also prone to softening and deforming, thereby reducing the braking force. The brake disc of the disc brake is directly exposed to the air, which has a good heat dissipation effect. The wind when driving at high speed can help dissipate heat. Now there are also ventilated disc brakes, which can achieve 360° heat dissipation without dead angles by setting ventilation holes on the side of the brake disc, which can effectively avoid the reduction of braking performance due to overheating.
2. Good drainage ：The brake drum of the drum brake is prone to water accumulation. In the event of heavy rain or when passing through a puddle, water will be difficult to drain out after entering. This will affect the braking effect and even cause the tire to lock. Moreover, if the accumulated water is not cleaned up in time.it will also cause the brake parts to rust and damage. The disc brake structure is conducive to drainage. There is basically no problem of water accumulation. It can maintain stable braking performance on wet or wet roads.
3. Good braking linearity：When the disc brake is applied, the braking force output is relatively linear and uniform. The braking force is controlled by the travel depth of the brake pedal. The driver can control the braking force more accurately, making the vehicle braking process smoother and providing better ride comfort. In addition, disc brakes can better cooperate with electronic control systems to achieve active safety control of vehicles, such as anti-lock braking system (ABS), electronic stability program (ESP), etc., to improve vehicle driving safety.  
4. Fast response time ：The brake caliper of the disc brake acts quickly. When the brake pedal is pressed, the high-pressure brake oil pushes the brake caliper brake pads to quickly clamp the brake disc. This allows the vehicle to stop immediately with a short braking distance. In contrast, the braking action of drum brakes is that the brake pads "push" outwards. The force is transmitted from the brake pedal to the brake pads and then to the brake drum. The mechanical structure in the middle is relatively complex and the response speed is slow.
5. Easy maintenance ： The structure of disc brake is relatively simple, with fewer parts. The brake disc and brake pad are exposed to the outside, which is convenient for inspection and replacement. The internal structure of the drum brake is complex. The brake shoes, brake cylinder and other components are installed in the brake drum. Many parts need to be disassembled during maintenance. The operation is difficult and the maintenance cost is also high.  

In summary, disc brakes have obvious advantages in heat dissipation, drainage, braking linearity, response speed and maintenance. They can better meet the high requirements of new energy heavy trucks for braking performance. Therefore, they are increasingly favored by new energy heavy truck manufacturers.