The so-called drum brake is composed of devices for rotation, fixation, actuation and positioning adjustment. Among them, there are small parts such as bottom plate, pump, hoof piece and so on. Usually it also has connecting rods, springs, spikes, brake drums and so on. Drum brakes are now more common in rear-wheel-drive cars. Today, I ’m going to popularize the difference between disc brakes and drum brakes.
First, the drum brake has a cast iron shaped like a tambourine, called a brake drum, which is fixed with the tire and rotates at the same speed. Disc brakes have the advantages of better reactivity and stability, better heat dissipation, and easy replacement. Drum brakes have lower costs and higher braking power, and are used more frequently in the rear wheels of small cars. But its wear rate is higher, so the overall cost is higher at the same time.
Second, disc brake pads (discs) are divided into ordinary disc type and ventilated disc type.
Ordinary disc type is solid. The ventilated disc type has the ventilation effect, which means that the centrifugal force generated by the car during exercise can make the air convection and achieve the purpose of heat dissipation, which is determined by the special structure of the disc disc.
From the appearance, it has many holes on the circumference that lead to the center of the circle. They are made by a special process, so they have a much better heat dissipation effect than ordinary discs.
Of course, due to the relationship between manufacturing process and cost, generally the middle and good cars usually use front ventilating discs, the rear ordinary disc brake pads, and the high-quality part of the good cars use front and rear ventilating discs. In addition, most economical cars use front discs and rear drum brake pads. The front discs used here are generally ordinary discs instead of ventilated discs.