A car braking system refers to a series of specialized devices that apply a certain force to certain parts of the car (mainly the wheels), thereby forcing it to a certain degree of forced braking. The function of the braking system is: forcing the driving car to slow down or even stop according to the requirements of the driver; to make the parked car stably park under various road conditions (including on the slope); to make the car driving downhill The speed remains stable.

Role: Forced braking

Force: External force opposite to the direction of the car

Purpose: to ensure the safe driving of the car technically

Classification: manual braking system, dynamic braking system, servo braking system

Type: drum brake, disc brake


Only the external force that acts on the car and has a direction opposite to the direction of the car, and the magnitude of these external forces are random and uncontrollable. Therefore, a series of special devices must be installed on the car to achieve The above functions.

The automobile braking system refers to the installation of a special braking mechanism on the automobile in order to technically ensure the safe driving of the automobile and increase the average speed of the automobile. Generally speaking, the automobile braking system includes two independent devices: a driving brake device and a parking brake device. Among them, the driving brake device is operated by the driver’s foot, so it is also called a foot brake device. The parking brake device is controlled by the driver’s hand, so it is also called a hand brake device.

The function of the service brake device is to slow down a moving car or stop the vehicle within the shortest distance. The function of the parking brake device is to keep the cars parked on various roads. However, sometimes in emergency situations, two types of braking devices can be used simultaneously to increase the effect of automobile braking. For some special-purpose cars and cars that are often driven in mountainous areas, long-term and frequent braking will cause overheating of the service braking device. Therefore, various types of auxiliary braking devices are often added to these vehicles to stabilize them when descending downhill. Speed.

According to the braking energy situation, the braking system can be divided into three types: manual braking system, dynamic braking system, and servo braking system. The human braking system uses the driver’s physical strength as the braking energy source; the power braking system uses the pneumatic or hydraulic pressure converted by the engine power as the braking energy source; and the servo braking system uses both human power and the engine power as the braking energy source. In addition, according to the transmission method of braking energy, the braking system can be divided into mechanical, hydraulic, pneumatic and electromagnetic types. In an automobile braking system, a brake is a component in an automobile braking system that is used to generate a force that prevents the vehicle from moving or a tendency to move. The brakes used in cars are friction brakes, that is, the braking torque that prevents the car from moving comes from the friction between the fixed element and the rotating work surface.

Drum Brake

Drum brake is a traditional braking method. Its working principle can be described vividly by a coffee cup. The brake drum is like a coffee cup. When you put five fingers into a rotating coffee cup, your fingers are brake pads. As long as you point five fingers outward, rub the inner wall of the coffee cup, the coffee cup will stop rotating. The drum brake on the car is simply composed of a brake oil pump, piston, brake pads and tympanum. When braking, the piston is pushed by the high-pressure brake oil of the brake cylinder to apply force to the two half-moon-shaped brake shoes To make it compact against the inner wall of the drum, friction force can prevent the brake drum from rotating to achieve the braking effect.

Disc Brakes

In recent years, the speed of automobiles has continued to increase, and the total weight of trucks and buses has continued to increase. In addition, the center of gravity of cars is generally lowered and tires with small diameters and wide sections are widely used, which restricts the installation position of brakes. Therefore, more and more disc brakes with good thermal stability can be used on heavy goods vehicles and cars. The disc brake can be divided into two types: caliper disc brake and full disc brake.

Disc brake is also called disc brake. Its working principle can be described by a disc. When you hold a rotating disc with your thumb and forefinger, the disc will also stop rotating. The disc brake on a car consists of a brake oil pump, a brake disc connected to the wheel, and brake calipers on the disc. When braking, the high-pressure brake fluid pushes the piston in the caliper and presses the brake shoes against the brake disc to produce a braking effect. Disc brakes are classified into ordinary disc brakes and ventilated disc brakes.

Ventilated disc brakes allow a gap between two brake discs to allow airflow to pass through them. Some ventilating discs also drill many circular vent holes on the disc surface, or cut out ventilation slots on the disc surface. Or prefabricated rectangular ventilation holes. Ventilated disc brakes use the effect of air currents, and their hot and cold effects are better than ordinary disc brakes. The main advantage of disc brakes is that they can brake quickly at high speeds. The heat dissipation effect is better than drum brakes. The braking performance is constant and it is easy to install advanced electronic equipment such as ABS. The main advantages of drum brakes are less wear of the brake shoes, lower cost and easy maintenance.Because the absolute braking force of drum brakes is much higher than that of disc brakes, they are commonly used on rear-wheel-drive trucks.

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