1. The advantage of the car brake drum is that under the condition of obtaining the same braking torque, the diameter of the car brake drum is much smaller than the diameter of the brake disc of the disc brake.
2. The automobile brake drum has a simple structure, low manufacturing cost, and easy installation of the hand brake mechanism. So drum brakes are also used a lot on the rear wheels of low-range front-wheel drive small cars.
3. Compared with the disc brake, the biggest disadvantage of the car brake drum is the poor heat dissipation. Since the brake working mechanism is enclosed in the brake drum, the heat cannot be dissipated quickly after continuous heavy braking. In addition, because the braking action of the drum brake is that the brake pads are "topped" outward, and the contact surface of the brake drum with the brake pads will become smaller after thermal expansion, which affects the braking efficiency.
4. Compared with car brake drum, the advantage of car brake disc is good heat dissipation. Since the brake pad is a "clamp" action to the brake disc, the contact area will not be affected after the car brake disc is heated and expanded. In addition, the entire braking mechanism is exposed to the outside, which is also more conducive to heat dissipation. The advantages of car brake discs are quick response, average braking force, better drainage and so on.
5. In addition to the higher manufacturing cost of the car brake disc compared to the drum brake, due to the different working methods, the friction area between the car brake disc and the brake pad is smaller than that of the drum brake, which leads to the braking force of the car brake disc is also higher than that of the drum brake. Drum brakes are small. In order to have a better braking force effect, the car brake disc must have a larger size brake disc and a larger brake caliper, which will inevitably increase the unsprung mass of the vehicle.
