The wheel is the only part of the car that comes into contact with the ground, and the sole purpose of braking is to stop the wheel from turning and is directly related to safety.
Next, the brakes will be interpreted from the type of brakes, the material of the brake discs, and the structure of the brake system.
Types of brakes
The main application of small buses on the market is drum brake and disc brake two kinds of brake structure, the vast majority of small buses on the market are using disc brakes, and because the drum brakes basically appear in some low-end models, while there are lower production costs, gradually drum brakes have become synonymous with low-end, but there are also models that are not low in price, such as Nissan's Tuda.
The drum brake pushes the brake pads by the piston inside the brake drums, causing frictional resistance between the brake pads and the outer brake drums. The braking performance of the drum brake is relatively excellent, and the biggest shortcoming is poor heat dissipation and thermal attenuation of continuous braking.
Compared with drum brakes, disc brakes are almost a "perfect choice", good ventilation, good drainage, simple structure and other advantages in one, but the braking force is slightly inferior to the drum brake, which is also the reason why almost the covered models are small buses.
Attentive fans will find that common disc brakes also have different textures and materials. Disc brakes mainly include glossy surfaces, scribing discs, and punching discs. Punched scribing reels have several lines.
Among them, the disc has poor high temperature resistance, the scribing disc can effectively remove the impurities between the brake pad and the brake disc, the punching disc can accelerate the air flow to take away the heat, and the punching scribing disc combines the advantages of punching and scribing.
But not the punch represents perfection, in the Porsche Cayenne development stage, Porsche has tested the punched brake disc, found that the punched brake disc will collect debris, resulting in the brake disc wear too fast, and even damage the braking system may be damaged.
Brake disc material
There are three main types of brake materials being used, metal-based brake discs, carbon-carbon brake discs and carbon-ceramic brake discs.
The vast majority of civilian cars use metal-based brake discs, and a small number of high-performance cars use expensive carbon-ceramic brake discs. Carbon carbon brake discs are a special material made of carbon lattice and carbon fiber, which is applied to F1 racing cars.
Carbon-ceramic brake discs have almost become one of the must-have logos for high-performance cars, and are used in high-speed trains, airplanes and other fields that require high-performance brakes, but this does not mean that the only choice for optimal braking is carbon-ceramic brakes.
Attentive fans will find that there are no carbon-ceramic brake discs on the cars of top races such as GT3 and WRC. We can believe that this is not the cost limit of the team's use of carbon ceramic brake discs, first of all, although the carbon ceramic brakes have extremely high temperature resistance, but does not mean that the brake parts do not need heat dissipation, if the local temperature continues to rise, it will affect the normal work of the entire vehicle, even if the carbon carbon material used in F1 does not have good heat dissipation ability, but F1 has a separate air duct to cool the brakes, the good thermal conductivity of the metal brake discs has become the first choice for GT3 and other racing cars.
At the same time, although the carbon ceramic brake disc can almost be used to scrap the vehicle, but there is still a chance of breaking, and the way to break is like a blast, although it is not easy to break, but a bad is crushing, if you just need strong braking, the consequences are unimaginable.
Brake construction
The braking system is divided into a driving part and a parking part, the driving part is composed of a brake pedal, a vacuum booster, a brake pressure sensor, a brake master pump, a brake tube, a brake, and a parking part consisting of a handbrake, a parking lock, and a rear brake.
When the brake pedal is pressed, the brake fluid in the brake master cylinder is driven to generate pressure, and the piston cylinder in the brake is pushed, so that the brake pads are clamped to generate braking force.
summary
The brake is the most important component of the whole vehicle, the working state of the brake has a close relationship with the safety of life and property, and it is hoped that the majority of car owners will check and maintain the brakes diligently. There are thousands of roads, safety is the first, and I hope that every departure can be safely arrived.