What is the difference between brake disc and Brake Drum?
TIME：2020.01.13
Now the types of cars on the market have countless, car models used by the brake products are also very different, the following let to far auto parts for you to introduce the brake products! Four-wheel brake drums have been standard on cars for decades. In the brake drum, hydraulic pressure is applied to the Piston, which pushes the curved brake shoe out. Friction material glued or riveted to the brake shoes presses against the inside of the drum, slowing down the drum and the axle, and the older cars stop. In fact, sometimes brake drums are effective, but if you use them only to try to stop a high-speed car, they have a limitation: they decay. Brake drum friction heat, leading to expansion. The brake shoes must move outward to make contact with the drum, which means that the brake pedal must be pressed deeply. Gases from the friction material's heat are also trapped inside the brake shoes and drum, reducing braking capacity. The first brake may stop the car quickly from high speed, but on the second brake, your luck may not be so good. Manufacturers add heat sinks or aluminum to the brake drum to cool the drum and the metal lining, but this is not the solution for high-performance brakes. That's where the brake disc comes in. Brake discs have been used in aircraft and industrial applications. By applying hydraulic pressure to the brake Caliper, the friction material (the pad) holds the rotating pad. Brakes don't seem to grip as easily as drums, so they offer better directional stability when stopped. Unlike a closed drum, the brake disc is open, which has both advantages and disadvantages. Brake disc, because the air is easy to pass through the friction material, can better cooling brake disc. The ventilated disc has two friction surfaces separated by a number of fins. This allows the air inside the disc to be better cooled between the friction surfaces. Most front brake discs are now ventilated because they do most of the braking; most rear brake discs are non-ventilated and have a "solid" disc because the rear brake discs do not generate as much heat. The advantage of the brake disc, the brake disc will be in operation with the rotation of dirty things and gas thrown out, and the brake drum will concentrate dirty things. Water, oil, and friction materials produce gases that disperse quickly for better braking. Some brake discs have holes or grooves, partly for aesthetic reasons, but also for practical purposes: water and gas on the surface of the disc and disc friction material can pass through the holes, so that the brake device can be put to immediate use, no cleaning by rotating the disc. This is important in a racing environment but not practical on a normal road. The holes reduce the area of the frictional material and can even trap small stones, so they require more maintenance. Brake disc weakness, brake disc exposed to the air for a long time, disc and brake disc between the dust will quickly wear out the brake disc. If the disk is too small, it will not give off heat and will burn up in extreme conditions; too many worn electrodes will have to be replaced. The front brake disc is in relatively clean air, but the rear brake disc is exposed to dust and debris from the front tyres. This is why rear brake discs generally wear out faster than front brake discs, although they do only a small, partial brake job. Anti-lock braking system use brake discs because they release quickly and smoothly. Although the shoe design and displacement changes now allow the drum to release more quickly, the disc still works better. For this reason, and for maximum braking capacity, many cars have four-wheel discs. The advantages of the brake disc and brake drum are different, the owner must, before selecting the product, check the vehicle use instructions, according to the vehicle type to select the appropriate braking products.
